Lasioglossum (Dialictus) rufornatum, Gardner & Gibbs, 2020

Gardner, Joel & Gibbs, Jason, 2020, The ‘ red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae) of the western Nearctic, European Journal of Taxonomy 725, pp. 1-242 : 173-180

Lasioglossum (Dialictus) rufornatum sp. nov.

urn:lsid:zoobank.org:act:5B74FC3D-BFF2-49CB-87D1-06002ACF1565

Figs 75–77 , 90M , 95C

Diagnosis

Females of Lasioglossum rufornatum sp. nov. can be recognized by the metasoma mostly dark with terga often metallic green and sterna and apical rims of the terga becoming orange to pale yellow, wings very pale with white hairs and sometimes nearly white veins, frons and mesepisternum very finely and densely punctate (i ≤ 1 pd), face moderately long (length/width ratio ~0.85), scutum shiny and moderately densely punctate (i=1–2 pd), and T1 anterior surface coriarious. They are most similar to an undescribed species widespread across most of the western United States with a longer face and no red or yellow colouration. They are also somewhat similar to L. eophilus . Females of L. eophilus have the mesepisternum rugose, metasomal terga not metallic, T1 anterior surface shiny, and ocelli slightly enlarged (separated by about 0.5 OD).

Males of L. rufornatum sp. nov. can be recognized by the clypeus sparsely punctate (i=1–5 pd) and entirely metallic blue-green, metasoma mostly dark reddish brown often with metallic green terga, with the sterna and apical rims of the terga becoming orange to pale yellow, S4–5 with very long and dense erect hair (2–4 OD), face between the eye emargination and clypeus and metasomal terga with dense tomentum, and gonostylus large, with very long, dense hair, and projecting laterally beyond the gonocoxite. They are most similar to an undescribed species widespread across most of the western United States with a longer face and no red or yellow colouration. They are also somewhat similar to L. miltolepoides sp. nov. Males of L. miltolepoides sp. nov. have tomentum absent on the face and sparse on the metasoma, S4–5 with relatively short hair (1–1.5 OD), and metasomal terga not metallic.

Specimens of both sexes from the southernmost part of their range (in the Algodones Dunes of Imperial County, California) often have extensive pale yellow to nearly white colouration rather than orange or red, which is unique.

Etymology

The specific epithet rufornatum is formed from the Latin adjective ‘ rufus ’ (‘red’) and the perfect participle ‘ ornatum ’ (‘adorned’). It refers to this species’ mostly dark metasoma which is adorned with red to yellow bands. An appropriate translation would be the ornate red sweat bee.

Material examined

Holotype

UNITED STATES – California • ♀; Imperial Co., Algodones Dunes , 6 km W of Glamis; 32.9861° N, 115.1346° W; 118 m a.s.l.; 3 Apr. 2013; T.L. Griswold leg.; ex Psorothamnus sp.; BBSL.

Paratypes

UNITED STATES – California • 1 ♀, 2 ♂♂; Imperial Co., 0.5 km NNE of jct. CA Hwy 78 and Osborne Park Road; 32.99° N, 115.132° W; 25–28 Mar. 2008; UCDC • 6 ♀♀; Imperial Co., 0.7 km NE of jct. CA Hwy 78 and Osborne Park Road; 32.99093° N, 115.1305° W; 26–27 Jun. 2009; UCDC • 1 ♀, 4 ♂♂; same location as for preceding; 24–29 Jun. 2009; UCDC • 42 ♀♀, 4 ♂♂; same location as for preceding; 3–4 Aug. 2009; UCDC • 14 ♀♀, 6 ♂♂; same location as for preceding; 3–7 Aug. 2009; UCDC • 7 ♀♀; same location as for preceding; 14–15 Sep. 2009; UCDC • 1 ♀, 3 ♂♂; same location as for preceding; 13–18 Sep. 2009; UCDC • 1 ♀; Imperial Co., 0.7 km NW of jct. CA Hwy 78 and Gecko Rd; 32.9812° N, 115.17867° W; 3–7 Aug. 2009; UCDC • 6 ♂♂; Imperial Co., 0.8 km NNE of jct. CA Hwy 78 and Osborne Park Road; 32.99183° N, 115.13043° W; 19–22 Sep. 2008; UCDC • 1 ♀; Imperial Co., 1.9 km ESE of Roadrunner Campground; 32.90178° N, 115.09807° W; 10 Mar. 2009; ex Mentzelia longiloba ; UCDC • 4 ♀♀; Imperial Co., 15 mi. NW of Glamis; 33.1167° N, 115.2667° W; 84 m a.s.l.; 13–15 Nov. 1994; R.R. Snelling leg.; LACM • 4 ♀♀; same location as for holotype; 3 Apr. 2013; T.L. Griswold leg.; ex Petalonyx sp.; BBSL • 3 ♀♀; same collection data as for holotype; BBSL • 2 ♀♀; same location as for holotype; 3 Apr. 2013; T.L. Griswold leg.; ex Palafoxia sp.; BBSL • 1 ♀; Imperial Co., All American Canal Water Drop One , 1.3 km ENE of Gordons Well exit Hwy I-8; 32.71289° N, 114.9441° W; 16 Oct. 2014; ex Tamarix ramosissima ; UCDC • 1 ♀, 6 ♂♂; Imperial Co., CA Hwy 78, 1.8 km W of Glamis Store, then 0.2 km N; 32.997° N, 115.092° W; 24 Apr. 2009; ex Palafoxia arida ; UCDC • 1 ♀; Imperial Co., CA Hwy 78, 1.8 km W of Glamis Store, then 0.3 km N; 32.99742° N, 115.09212° W; 24–29 Jun. 2009; UCDC • 2 ♀♀; same location as for preceding; 3–4 Aug. 2009; UCDC • 5 ♀♀; same location as for preceding; 3–7 Aug. 2009; UCDC • 3 ♀♀; Imperial Co., CA Hwy 78, 1.8 km W of Glamis Store, then 0.4 km S; 32.99113° N, 115.09195° W; 3–4 Aug. 2009; UCDC • 1 ♂; same location as for preceding; 3–7 Aug. 2009; UCDC • 1 ♀; Imperial Co., Coachella Canal Road 0.4 km NW of CA Hwy 78; 32.97535° N, 115.18722° W; 20 Sep. 2008; ex Psorothamnus emoryi ; UCDC • 1 ♀; Imperial Co., Coachella Canal Road 11.6 km NW of CA Hwy 78; 33.05738° N, 115.25752° W; 1 Mar. 2010; ex Larrea tridentata ; UCDC • 1 ♂; Imperial Co., Coachella Canal Road 11.6 km NW of CA Hwy 78, then 1.0 km NE; 33.063° N, 115.25° W; 28–29 Apr. 2008; UCDC • 1 ♀; same location as for preceding; 30 May–3 Jun. 2008; ex Croton wigginsii ; UCDC • 2 ♀♀, 3 ♂♂; same location as for preceding; 30 May–3 Jun. 2008; UCDC • 40 ♀♀, 1 ♂; Imperial Co., Coachella Canal Road 11.6 km NW of CA Hwy 78, then 1.3 km E; 33.05827° N, 115.24338° W; 12 Mar. 2009; ex Mentzelia longiloba ; UCDC • 8 ♀♀, 1 ♂; same location as for preceding; 9–14 Mar. 2009; ex Palafoxia arida ; UCDC • 1 ♀; Imperial Co., Coachella Canal Road 11.6 km NW of CA Hwy 78, then 1.7 km E; 33.05763° N, 115.2397° W; 14 Mar. 2009; ex Croton wigginsii ; UCDC • 1 ♀; Imperial Co., Coachella Canal Road 6.5 km NW of CA Hwy 78; 33.02037° N, 115.22538° W; 29 Apr.–2 May 2008; UCDC • 1 ♀; same location as for preceding; 30 May–1 Jun. 2008; UCDC • 1 ♀, 1 ♂; Imperial Co., End of Ogilby Road, 0.4 km S of Hwy I-8; 32.75567° N, 114.83617° W; 19 Mar. 2016; ex Palafoxia arida ; UCDC • 2 ♀♀; Imperial Co., end of Ogilby Road, 0.5 km S of Hwy I-8; 32.75462° N, 114.83667° W; 10–11 Mar. 2009; ex Larrea tridentata ; UCDC • 13 ♀♀; same location as for preceding; 10–11 Mar. 2009; ex Mentzelia longiloba ; UCDC • 1 ♂; Imperial Co., Evan Hewes Hwy, 1.5 mi. E of Brock Res. Stn Rd.; 32.7092° N, 115.0139° W; 41 m a.s.l.; 19 Apr. 2008; G.R. Ballmer leg.; ex Palafoxia linearis ; UCRC • 1 ♀; Imperial Co., Gecko Road 0.4 km SSE of CA Hwy 78; 32.9725° N, 115.17322° W; 26–27 Jun. 2009; UCDC • 1 ♀; same location as for preceding; 3–7 Aug. 2009; UCDC • 5 ♀♀, 6 ♂♂; Imperial Co., Gecko Road 2.1 km SSE of Cahuilla Ranger Station; 32.95737° N, 115.16328° W; 7–10 Jul. 2008; ex Eriogonum deserticola ; UCDC • 2 ♀♀, 5 ♂♂; same location as for preceding; 7–10 Jul. 2008; UCDC • 3 ♂♂; same location as for preceding; 19–22 Sep. 2008; ex Eriogonum deserticola ; UCDC • 4 ♂♂; same location as for preceding; 19–22 Sep. 2008; UCDC • 2 ♀♀, 3 ♂♂; Imperial Co., Gecko Road 4.1 km SE of Cahilla Ranger Station; 32.94552° N, 115.14735° W; 7–9 Jul. 2008; UCDC • 1 ♂; Imperial Co., Gecko Road 4.8 km SSE of Cahilla Ranger Station; 32.938° N, 115.145° W; 23–24 Apr. 2009; ex Psorothamnus emoryi ; UCDC • 2 ♀♀; Imperial Co., Glamis ; [33° N, 115.07° W]; 24 Jan. 1964; UCDC • 3 ♀♀; same location as for preceding; 23 Mar. 1967; UCDC • 1 ♀; same location as for preceding; 11 Oct. 1972; UCDC • 2 ♀♀; same location as for preceding; 5 Oct. 1988; UCDC • 1 ♂; Imperial Co., 3 mi. N of Glamis; [33.04° N, 115.07° W]; 7–12 Apr. 1973; UCDC • 1 ♀, 1 ♂; Imperial Co., Glamis Dunes; [33° N, 115.1° W]; 16 Dec. 1982; UCDC • 1 ♀; Imperial Co., Glamis Dunes, W Glamis; 32.9941° N, 115.1013° W; 91 m a.s.l.; 29 Sep. 1987; T.L. Griswold leg.; BBSL • 1 ♀; Imperial Co., Niland-Glamis Road 23.4 km NW of CA Hwy 78, then 0.8 km WSW; 33.1237° N, 115.27735° W; 25 Mar. 2013; ex Sphaeralcea sp.; UCDC • 1 ♀; Imperial Co., Niland-Glamis Road 3.0 km NW of CA Hwy 78, then 0.8 km SW; 33.00773° N, 115.10257° W; 6–9 Feb. 2008; UCDC • 1 ♂; same location as for preceding; 6–9 Feb. 2008; UCDC • 1 ♀; Imperial Co., Niland-Glamis Road 7.4 km NW of CA Hwy 78; 33.03727° N, 115.13487° W; 30 May–3 Jun. 2008; UCDC • 3 ♀♀; same location as for preceding; 23–24 Apr. 2009; ex Stephanomeria pauciflora ; UCDC • 3 ♀♀; Imperial Co., Niland-Glamis Road 9.8 km NW of CA Hwy 78, then 1.9 km SSW; 33.03778° N, 115.16474° W; 18 Oct. 2014; ex Palafoxia arida ; UCDC • 1 ♀; Imperial Co., Niland-Glamis Road 9.8 km NW of CA Hwy 78, then 3.2 km SW; 33.02868° N, 115.17459° W; 18 Nov. 2014; ex Baccharis sarothroides ; UCDC • 1 ♂; Imperial Co., Roadrunner Campground, Gecko Road 9.8 km SE of CA Hwy 78; 32.9079° N, 115.11664° W; 11–15 Sep. 2007; UCDC • 1 ♂; same location as for preceding; 31 May–3 Jun. 2008; UCDC • 1 ♀, 2 ♂♂; same location as for preceding; 31 May–3 Jun. 2008; UCDC • 1 ♀; same location as for preceding; 6–8 Jul. 2008; UCDC • 1 ♂; Imperial Co., Wash Road 0.6–1.1 km SE of CA Hwy 78; 32.99399–32.99138° N, 115.06573–115.0617° W; 30 May–3 Jun. 2008; ex Baileya pleniradiata ; UCDC • 2 ♂♂; Imperial Co., Wash Road 0.9 km SE of CA Hwy 78; 32.99243° N, 115.06378° W; 24 Apr. 2009; ex Asclepias subulata ; UCDC • 1 ♀; Imperial Co., Wash Road 1.6 km SE of CA Hwy 78, then 0.3 km SW; 32.98677° N, 115.05927° W; 26–27 Jun. 2009; UCDC • 1 ♀; Imperial Co., Wash Road 11.3 km SE of CA Hwy 78, then 1.0 km SW; 32.92382° N, 114.99087° W; 29 Apr.–2 May 2008; UCDC • 1 ♀; Imperial Co., Wash Road 11.3 km SE of CA Hwy 78, then 1.0 km SW; 32.92347° N, 114.99039° W; 6–10 Jul. 2008; UCDC • 2 ♀♀; same location as for preceding; 18–22 Sep. 2008; UCDC • 2 ♀♀; Imperial Co., Wash Road 11.3 km SE of CA Hwy 78, then 1.2 km SW; 32.92335° N, 114.9919° W; 30 May–3 Jun. 2008; UCDC • 2 ♀♀; same location as for preceding; 30 May–3 Jun. 2008; UCDC • 1 ♀; Imperial Co., Wash Road 6.7 km SE of CA Hwy 78; 32.957° N, 115.01802° W; 7–10 Jul. 2008; UCDC • 1 ♀; 10.1 mi. W of Glamis; [33° N, 115.25° W]; 3Apr. 1960; R.C. Dichman leg.; ex Larrea divaricata ; UCRC • 1 ♀; Winterhaven; [32.74° N, 114.63° W]; 31 May 1930; Timberlake leg.; ex Sphaeralcea orcuttii ; UCRC. – Nevada • 2 ♀♀; Clark Co., Kaolin Wash, S Overton; 36.5117° N, 114.4442° W; 3 Jun. 2001; D. Yanega leg.; ex Stephanomeria ; UCRC • 3 ♀♀; Clark Co., Magnesite Wash, S Overton; 36.5117° N, 114.4442° W; 25 May 2009; D. Yanega leg.; UCRC • 1 ♀; Clark Co., Moapa Val ., Kaolin Wash , E of Overton; 36.5119° N, 114.4442° W; 3 Jun. 2001; G.R. Ballmer leg.; ex Croton californicus ; UCRC • 1 ♀; same location as for preceding; 3 Jun. 2001; G.R. Ballmer leg.; ex Chilopsis linearis ; UCRC .

Description

Female

COLOURATION. Head and mesosoma blue to olive green; clypeus apical colour black, reddish brown, or orange; labrum reddish brown to orange; mandible orange with black basal spot or band and red tip; flagellum reddish brown dorsally, orange to pale yellow ventrally; pronotal lobe orange to pale yellow; metasoma reddish brown to pale yellow with discs of T1–5 metallic blue-green and dark spiracular spots on T2–4; legs black to reddish brown with femur-tibia joints, base and apex of tibiae, and tarsi orange to pale yellow; tegula orange to pale yellow; wing membrane hyaline, veins with subcosta brown to dark brown, otherwise orange to white.

PUBESCENCE. Body hair colour white. Tomentum dense on paraocular area, lower frons, gena, pronotal collar and lobe, space between pronotal lobe and tegula, metanotum, preëpisternum, metepisternum, T1 laterally, T2 basally, and T3–4 throughout; sparse on supraclypeal area, scutum lateral margin, hypoepimeron, and mesepisternum. Scutum hair thin to densely plumose. Wing hairs light, long and sparse. Acarinarial fan complete, dense. T2 fringes sparse, T3 fringes sparse.

SURFACE SCULPTURE. Clypeus punctures sparse (i =1–4 pd), becoming moderately dense in basal third (i =1–2 pd), sculpture shiny, becoming weakly tessellate basally; supraclypeal area punctures dense (i ≤ 1 pd), sometimes sparse medially (i= 1–3 pd), sculpture tessellate, sometimes shiny medially; paraocular area punctures dense (i <1 pd), sculpture shiny, sometimes tessellate around antenna socket; frons punctures crowded (i=0 pd), sculpture shiny; vertex punctures crowded (i= 0 pd), becoming moderately dense medially (i=1–2 pd), sculpture shiny; gena punctures fine, moderately dense (i=1–2 pd), sculpture shiny; postgena sculpture imbricate to finely ruguloso-lineate, sometimes becoming smooth and shiny anteriorly; tegula punctures absent; scutum punctures dense (i <1 pd), becoming slightly sparser submedially and anteromedially (i=1–2 pd), sculpture shiny, becoming tessellate anteromedially; scutellum punctures dense marginally and on median line (i <1 pd), moderately sparse submedially (i=1–2 pd), diversopunctate, sculpture shiny; metanotum sculpture rugulose, becoming shiny and finely, densely punctate anteromedially (i <1 pd); metapostnotum rugae strong, anastomosing or subparallel, reaching margin, sculpture imbricate or weakly so; preëpisternum sculpture rugulose; hypoepimeron punctures crowded (i=0 pd), sculpture imbricate; mesepisternum punctures dense (i ≤ 1 pd), becoming crowded dorsally (i =0 pd), sculpture shiny; metepisternum sculpture lineate dorsally, imbricate ventrally; propodeum lateral face sculpture tessellate; propodeum posterior face sculpture tessellate; T1 anterior face sculpture coriarious; T1 dorsal surface punctures moderately dense (i=1–3 pd), absent or very sparse in large apicolateral oval patches, sculpture shiny; T2 disc punctures moderately dense (i= 1–3 pd), disc sculpture shiny, rim punctures fine, moderately sparse (i=1–4 pd), rim sculpture shiny.

STRUCTURE. Face length/width ratio 0.85 (± 0.01 SD). Clypeus projecting ~67% below suborbital tangent; clypeal area length/width ratio 0.44 (± 0.02 SD); apicolateral denticles rounded knobs; supraclypeal area length/width ratio 0.9 (± 0.06 SD). Forewing with 3 submarginal cells; pronotal angle obtuse; tegula shape normal. Intertegular distance 1.06 (± 0.04 SD) mm. Scutum length/width ratio 0.8 (± 0.02 SD); scutum/scutellum length ratio 3.14 (± 0.12 SD); scutellum/metanotum length ratio 1.45 (± 0.15 SD); metanotum/metapostnotum length ratio 0.74 (± 0.05 SD). Propodeum lateral carinae not reaching dorsal margin; oblique carina weak (sometimes virtually absent), straight. T2 depressed apical rim length less than 50% of segment. (n=10)

Male

COLOURATION. Head and mesosoma blue to olive green; clypeus apical colour concolourous with base; labrum black to reddish brown; mandible orange to yellow with brown basal spot and red tip; flagellum orange to pale yellow, becoming reddish brown on dorsal surface toward base; pronotal lobe orange to pale yellow; metasoma black to reddish brown with rims of terga and sterna broadly pale yellow to translucent brown, discs of terga weakly metallic blue-green, and dark spiracular spots on T2–4; legs reddish brown with femur-tibia joints, base and apex of tibiae, and tarsi orange to pale yellow; tegula orange to pale amber; wing membrane hyaline, veins with subcosta dark brown, otherwise white to brown.

PUBESCENCE. Body hair colour white. Tomentum dense on face below eye emargination and above clypeus, gena, pronotal angle and lobe, space between pronotal lobe and tegula, metepisternum, T1 laterally, T2–3 basolaterally, and T4–5 throughout; sparse on clypeus, scutum and scutellum marginally, preëpisternum, mesepisternum, and T6. Scutum hair thin to densely plumose. Sterna hair long (2–4 OD), moderately plumose, dense and erect. Wing hairs light, short and sparse.

SURFACE SCULPTURE. Clypeus punctures sparse (i= 1–5 pd), sculpture shiny; supraclypeal area punctures moderately sparse (i= 1–3 pd), sculpture shiny; paraocular area punctures moderately dense (i= 1–2 pd), sculpture shiny; frons punctures dense(i <1pd),sculpture shiny;vertex punctures dense laterally (i ≤ 1pd), sparse medially (i= 1–3 pd), sculpture shiny; gena punctures moderately sparse (i= 1–2 pd), sculpture shiny; postgena sculpture imbricate and sometimes lineolate; tegula punctures absent; scutum punctures moderately dense (i =1–2 pd), becoming sparse submedially (i =1–3 pd), sculpture shiny; scutellum punctures moderately dense (i=1–2 pd), becoming sparse submedially (i =1–3 pd), sculpture shiny; metanotum sculpture shiny and densely punctate (i <1 pd), becoming rugulose laterally; metapostnotum rugae weak, subparallel, nearly reaching margin, sculpture shiny to weakly imbricate; preëpisternum sculpture areolate; hypoepimeron punctures crowded (i=0 pd), sculpture shiny; mesepisternum punctures dense (i <1 pd), becoming moderately sparse and diversopunctate ventrally (i=1–2 pd), sculpture shiny; metepisternum sculpture ruguloso-lineate dorsally, areolate-rugulose ventrally; propodeum lateral face punctures obscure, sculpture tessellate to rugulose; propodeum posterior face sculpture shiny; T1 anterior face sculpture coriarious; T1 dorsal surface punctures moderately sparse (i=1–3 pd), becoming sparse in small apicolateral oval patches (i =1–4 pd) and absent on apical rim, sculpture shiny; T2 disc punctures moderately sparse (i= 1–3 pd), disc sculpture shiny, rim punctures moderately sparse basomedially (i= 1–3 pd), otherwise absent, rim sculpture shiny.

STRUCTURE. Face length/width ratio 0.86 (± 0.01 SD). F1:pedicel length ratio 0.89 (± 0.06 SD); F2:F1 length ratio 1.55 (± 0.12 SD); F2 length/width ratio 1.23 (± 0.17 SD); F9 length/width ratio 0.98 (± 0.05 SD). Forewing with 3 submarginal cells; pronotal angle obtuse; tegula shape normal. Intertegular distance 1.02 (± 0.16 SD) mm. Scutum length/width ratio 0.77 (± 0.03 SD); scutum/scutellum length ratio 2.91 (± 0.37 SD); scutellum/metanotum length ratio 1.61 (± 0.16 SD); metanotum/metapostnotum length ratio 0.63 (± 0.06 SD). Propodeum lateral carinae not reaching dorsal margin; oblique carina absent. (n =5)

GENITALIA. As in Fig. 90M . Gonocoxite broad, rounded. Gonostylus very large, oblong, directed laterally beyond gonocoxite, with dense long hair. Retrorse lobe relatively narrow, ovoid, with dense long hair on margins.

Range

Colorado River valley from the Algodones Dunes north to Moapa ( Fig. 77 ).

Floral records

APOCYNACEAE Juss. Asclepias L. A. subulata Decne. • ASTERACEAE Giseke : Baccharis : B. sarothroides A.Gray • Baileya : B. pleniradiata Harv. & A.Gray ex A.Gray • Palafoxia : P. arida B.L. Turner & M.I. Morris • P. linearis (Cav.) Lag. • Stephanomeria : S. pauciflora (Torr.) A. Nelson • BIGONIACEAE Juss. Chilopsis D. Don : C. linearis (Cav.) Sweet • EUPHORBIACEAE Juss. Croton L. C. californicus M̹ll. Arg. • C. wigginsii L. C. Wheeler • FABACEAE Juss. Psorothamnus : P. emoryi (A.Gray) Rydb. • LOASACEAE Juss. Mentzelia L. M. longiloba J. Darl. • Petalonyx A.Gray • MALVACEAE Juss. Sphaeralcea A. St. -Hil. S. orcuttii Rose • POLYGONACEAE Juss. Eriogonum Michx. E. deserticola S. Watson • TAMARICACEAE Link : Tamarix L. T. ramosissima Ledeb. • ZYGOPHYLLACEAE R.Br. Larrea Cav. L. divaricata Cav. • L. tridentata (Sessé & Moc. ex DC.) Coville.

DNA barcodes

Two sequences available (BOLD process IDs: DLIII198-20, DLIII199-20; BIN: BOLD:ACM2990). Lasioglossum rufornatum sp. nov. differs from all other western red-tailed L. ( Dialictus ) by 1 fixed substitution: 432(T) (Supplementary file 4).

Remarks

Lasioglossum rufornatum sp. nov. is extremely abundant in the Algodones Dunes of Imperial County, California, and becomes rarer further north along the Colorado River. No specimens have been seen from far beyond the Colorado River valley. It very likely also occurs in the Gran Desierto de Altar.

Figures

Fig. 75. Lasioglossum (D.) rufornatum sp. nov., ♀. A. Dorsal habitus. B. Lateral habitus. C. Face. D. Propodeum and metasoma. Scale bars: 1 mm.

Fig. 76. Lasioglossum (D.) rufornatum sp. nov., ♂. A. Dorsal habitus. B. Face. C. Lateral habitus. D. Propodeum and metasoma. Scale bars: 1 mm.

Fig. 77. Georeferenced collection records of Lasioglossum (D.) rufornatum sp. nov. (black squares) and predicted distribution by maximum entropy ecological niche modeling in Maxent (colour shading). Warmer colours indicate higher cloglog probability of occurrence.

Fig. 90. Male genitalia. A. Lasioglossum (D.) arenisaltans sp. nov. B. L. (D.) clastipedion sp. nov. C. L. (D.) clematisellum (Cockerell, 1904). D. L. (D.) hudsoniellum (Cockerell, 1919). E. L. (D.) julipile sp. nov. F. L. (D.) lilianae sp. nov. G. L. (D.) mesillense (Cockerell, 1898). H. L. (D.) meteorum sp. nov. I. L. (D.) miltolepoides sp. nov. J. L. (D.) minckleyi sp. nov. K. L. (D.) pallidellum (Ellis, 1914). L. L. (D.) pictum (Crawford, 1902). M. L. (D.) rufornatum sp. nov. N. L. (D.) spivakae sp. nov. O. L. (D.) testaceum (Robertson, 1897).P. L. (D.) vierecki (Crawford, 1904). Q. L. (D.) zephyrus (Smith, 1853). Genitalia are illustrated in dorsal view and positioned such that the gonostylus is parallel to the plane of vision. Retrorse lobes are also illustrated separately to the bottom left of each figure in lateral view, positioned parallel to the plane of vision.

Fig. 95. T1 anterior face. A. Lasioglossum (D.) kunzei (Cockerell, 1898), ♀, shiny with weak and worn acarinarial fan. B. L. (D.) argammon sp. nov., ♀, weakly coriarious with sparse acarinarial fan. C. L. (D.) rufornatum sp. nov., ♀, strongly coriarious with dense and well-developed acarinarial fan. Arrows point to areas where microsculpture is most easily visible. Scale bar is 0.5 mm.