Lasioglossum (Dialictus) novascotiae (Mitchell)

Gibbs, Jason, 2010, Revision of the metallic species of Lasioglossum (Dialictus) in Canada (Hymenoptera, Halictidae, Halictini) 2591, Zootaxa 2591 (1), pp. 1-382 : 207-211

Lasioglossum (Dialictus) novascotiae (Mitchell)

( Figures 153A–D , 154A–F )

Dialictus novascotiae Mitchell, 1960: 407 . ♀. Holotype. ♀ Canada, Nova Scotia, Baddeck , 27.viii.1926, [NCSU]. Examined.

Taxonomy. Knerer & Atwood, 1964: Dialictus novascotiae ♂, p. 5 (description); Krombein, 1967: Lasioglossum (Dialictus) novascotiae , p. 464 (catalogue); Hurd, 1979: Dialictus novascotiae , p. 1968 (catalogue); Moure & Hurd, 1987: Dialictus novascotiae , p. 115 (catalogue).

Diagnosis. See diagnosis for L. lineatulum .

Redescription. FEMALE. Length 5.80–6.95 mm; head length 1.70–1.73 mm; head width 1.78–1.82 mm; forewing length 4.58–4.94 mm.

Colouration. Head and mesosoma greenish blue. Clypeus with apical 2/3 blackish brown and basal portion brassy. Supraclypeal area pale green. Antenna dark brown, flagellum with ventral surface reddish brown. Tegula dark reddish brown. Wing membrane subhyaline, venation and pterostigma yellowish brown. Legs brown, medio- and distitarsi reddish brown. Metasoma blackish brown, terga and sterna with apical margins reddish brown.

Pubescence. Dull white. Moderately sparse. Head and mesosoma with moderately sparse woolly hairs (1– 1.5 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD). Lower paraocular area and gena without subappressed tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with sparse, fine setae. T1 acarinarial fan incomplete. T2–T3 basolaterally and T4 with at most sparse tomentum.

Surface sculpture. Face imbricate. Clypeus apical half polished with sparse punctation (i=1–3d). Supraclypeal area with punctation moderately dense (i=1–1.5d). Lower paraocular and antennocular areas with punctation moderately dense (i=1–1.5d). Upper paraocular area and frons punctate-reticulate. Ocellocular area obscurely punctate (i=d). Gena lineolate. Postgena weakly lineolate. Mesoscutum weakly imbricate, punctation between parapsidal lines sparse (i=1–4d), moderately sparse laterad of parapsidal lines (i=1–2.5d), contiguous on anterolateral portions. Mesoscutellum sparsely punctate. Axilla punctate. Metanotum imbricate. Preëpisternum rugose. Hypoepimeral area imbricate. Mesepisternum weakly rugose dorsally, rugulose ventrally. Metepisternum with dorsal half rugoso-striate, ventral half imbricate. Metapostnotum completely rugoso-striate. Propodeum with dorsolateral slope rugulose, lateral surface rugulose above, imbricate below, posterior surface imbricate. Metasomal terga faintly coriarious, punctation on basal halves moderately dense (i=1–1.5d), apical halves impunctate.

Structure. Head wide (length/width ratio = 0.95–0.96). Eyes convergent below (UOD/LOD = 1.16–1.20). Clypeus ½ below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/OAD <0.5). Frontal line carinate, ending 2.5 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3–5 teeth. Metapostnotum moderately elongate (MMR ratio = 1.24), posterior margin narrowly rounded onto posterior surface. Propodeum with oblique carina weak, lateral carina incomplete, not reaching dorsal margin..

MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 6.40– 7.22 mm; head length 1.61–1.75 mm; head width 1.60–1.73 mm; forewing length 4.33–4.76 mm

Colouration. Head and mesosoma bluish green. Flagellum with ventral surface reddish to brownish yellow. Tarsi brownish yellow.

Pubescence. Face below eye emargination with moderately dense tomentum, partially obscuring surface. Lower paraocular area with dense tomentum. S3 apicolateral portion and S4–S5 lateral portions with subappressed plumose hairs (1–1.5 OD).

Surface sculpture. Postgena lineolate. Metanotum rugulose. Metapostnotum striate. Propodeum with dorsolateral slope and lateral and posterior surfaces rugose. T2–T4 punctation uniform on basal halves (i=1.5– 2d), apical half impunctate (except along premarginal line).

Structure. Head moderately elongate (length/width ratio = 1.00–1.04). Eyes strongly convergent below (UOD/LOD = 1.48–1.50). Antennal sockets distant (IAD/OAD>1.2). Frontal line carinate, ending 2 OD below median ocellus. Pedicel less than F1. F2 length 1.6–1.7X F1. F2–F10 elongate (length/width ratio = 1.57–1.86). Metapostnotum moderately elongate (MMR ratio = 1.15–1.36), posterior margin sharply angled onto posterior surface.

Terminalia . S7 with median lobe narrowly, weakly clavate, apex rounded ( Fig. 154F ). S8 with apicomedial margin weakly convex ( Fig. 154F ). Genitalia as in Fig. 154D–E . Gonobase with ventral arms widely separated. Gonostylus small, dorsal setae elongate. Retrorse lobes narrow, weakly attenuated apically.

Range. Nova Scotia west to British Columbia ( Fig. 155 ).

Additional material examined. CANADA: ALBERTA: 1♀ Writing-On-Stone P.P., Sedge-South , 12– 20.vi.1990 (D. McCorquodale); [ PMAE] ; BRITISH COLUMBIA: 1♀ 17.vii.2002 ; 1♀ 6.vii.2002; 1♀ 5.vii.2002; [ PCYU] ; NEW BRUNSWICK: 1♀ Tabusintac , 17.vi.1937 (J.W. Cadbury); [ ANSP]; NORTH- WEST TERRITORIES: 1♀ 1906 [ CNC] ; 2♂♂ Mackenzie Dist., Norman Wells , N65°15ʹ15 ʹ W126°41ʹ15 ʹ, 22.viii–1.ix.2005 (D. Currie & R. Popko); [ ROM] ; NOVA SCOTIA: 1♀ Kings Co., Wst. Blk. Rck. , N45.1296 W064.7383, 19.ix.2001 (C. Sheffield) ; 8♀ 1♂ Sable Island , N43.9319 W059.9985, 8.viii.2008 (P.M. Catling); [ PCYU] ; ONTARIO: 3♂♂ Hearst , 13.viii.1962 (G. Knerer) ; 1♀ 2♂♂ Upsala , 14.viii.1962 (G. Knerer); [ ROM] ; 1♀ Metcalf , 29.vii.1983 (B.E. Cooper); [ PMAE] ; PRINCE EDWARD ISLAND: 1♀ Queens Co., 7.vii.2006, 9:05h–9:35h ( V. MacPhail) ; 1♀ Queens Co., 15.vii.2006, 9:35h–9:50h ( V. MacPhail); [ PCYU] ; SASKATCHEWAN: 4♂♂ Sask. Landing , 23.vii.1956 (O. Peck); [ CNC] ; USA: MICHIGAN: 1♀ Saugatuck , 19.v.2004 (J. Tuell); [ ARC] .

Floral records. ASTERACEAE : Achillea , Anaphalis , Aster , Solidago , ONAGRACEAE : Epilobium , Oenothera , ROSACEAE : Fragaria , SALICACEAE : Salix .

Comments. Uncommon. This evidently a boreal species and one of two Lasioglossum species collected on Sable Island, Nova Scotia (see L. sablense below).

Figures

FIGURE 153. Lasioglossum novascotiae (Mitchell). Female (A) lateral habitus; (B) dorsal habitus; (C) face; (D) metapostnotum. Scale bars, A–C = 1 mm.

FIGURE 154. Lasioglossum novascotiae (Mitchell). Male (A) lateral habitus; (B) dorsal habitus; (C) face; (D) ventral view of genital capsule; (E) dorsal view of genital capsule; (F) S7, S8. Scale bars, A–C = 1 mm, F = 0.5 mm.

FIGURE 155. Distribution of Lasioglossum novascotiae (light grey and star) and L. oblongum (dark grey).