Lasioglossum (Evylaeus) latifacies Murao

Murao, Ryuki, Tadauchi, Osamu, Goubara, Masashi & Maeta, Yasuo, 2010, Taxonomy of the carinaless group of Lasioglossum (Evylaeus) (Hymenoptera, Halictidae) from the Ryukyu Islands, Japan, with description of seven new species, Zootaxa 2669, pp. 1-33 : 16-18

Lasioglossum (Evylaeus) latifacies Murao sp. nov.

( Figs. 4 E, 4F, 9)

Description. Female. Body length 4.7–5.3 mm, wing length 4.1–4.5 mm (n= 5).

Color. Tegula yellowish brown translucent. Posterior margins of metasomal terga broadly yellowish brown translucent.

Pilosity. T1 ( Fig. 4 F) medially with sparse simple and short hairs. Metasomal terga with neither basal hair bands nor apical fimbriae.

Structure. Head wider than long; head length/width ratio 0.85–0.92 (n= 10). Interocellar distance subequal to ocellocular distance. Frons and paraocular area dull, reticulate-punctate. Supraclypeal area ( Fig. 9 B) dull, with dense PP and IS with weak tessellation on the entire surface. Clypeal length 1.3x distance between lower rim of antennal socket and upper margin of clypeus, with moderately dense PP on upper 2/3, and with sparse larger shallow PP on lower 1/3; IS with weak tessellation on upper 2/3, and smooth on lower 1/3. Basal area of labrum 2.6x as wide as long; distal process without lateral projection; keel of distal process broad, apically bluntly pointed in frontal view. Scape length approximately 0.6 mm (n= 5). Mesoscutum ( Fig. 9 C, D) shiny, with dense PP and IS with distinct tessellation on the entire surface. Mesoscutellum ( Fig. 9 E) shiny, marginally and longitudinally with moderately PP; IS with weak tessellation on the entire surface. Mesepisternum ( Fig. 9 F) shiny, with dense PP and IS nearly smooth on upper area, and with weak rugulae on lower area. Propodeal dorsum ( Fig. 9 H) nearly as long as mesoscutellum, and 1.2x metanotum, dorsomedially with longitudinal ridges on basal 2/3 and weak tessellation on apical 1/3; lateral slope, propodeal side, and shield with weak tessellation. Inner hind tibial spur ( Fig. 9 I) with 2–5 teeth (n= 5). T1 ( Fig. 4 F) with weak lineolation on the entire surface, and medially with sparse obscure PP. T2–T4 similar lineolation with T1 on the entire surface.

Male. Unknown.

Remarks. The species code sp. Y–1 reported by Maeta et al. (2004) corresponds to this new species. Within the sexstrigatum -group, this species is similar to Lasioglossum (Evylaeus) zipangu Ebmer & Sakagami from the southern Ryukyus. For the differences between the species see the key. So far as the first author surveyed in Iriomote-jima, this species was found from open land to humid or dry subtropical forest.

Etymology. The specific name is derived from the broad head.

Distribution. Japan (southern Ryukyus: Ishigaki-jima, Iriomote-jima).

Flight records. Female: February to November.

Flower records. The flowering plants visited by this species were six species in five families listed as follows. Apiaceae : Oenanthe javanica var. japonica . Aquifoliaceae : Ilex rotunda . Euphorbiaceae : Mallotus japonicus . Rubiaceae : Ophiorrhiza kuroiwae . Rutaceae : Tetradium glabrifolium var. glaucum ; Zanthoxylum ailanthoides var. ailanthoides .

Type material. Holotype (Type No. ELKU 3307): female, Shirahama-rindô, Iriomote-jima, Okinawa Pref., Ryukyus, JAPAN, 18. v. 2007 (R. Murao leg., RMPC). Paratypes: [Ryukyus: JAPAN] Ishigaki-jima, Okinawa Pref.: 2 females, Botanical Garden Banna, 6. vi. 1974 (H. Makihara, ELKU); 1 female, Mt. Karayama, 14–18. iii. 1964 (M. Yoshimoto, ELKU); 1 female, Mt. Kawara-dake, 14. iii. 1964 (S. Kimoto, ELKU); Yonehara, 15. iii. 1964 (T. Shirôzu, ELKU). Iriomote-jima, Okinawa Pref.: 6 females, 12–15. vii. 2002 (Y. Maeta, MCDS), 14–18. ix. 2003 (Y. Maeta, MCDS), 6–9. xi. 2003 (Y. Maeta, MCDS), 22–27. vii. 2007 (Y. Maeta, MCDS); 4 females, Funaura, 5. ii. 2008 (K. Mitai, RMPC), 15. iv. 1979 (H. Makihara, ELKU); 26. vii. 2005 (O. Tadauchi, ELKU); 8 females, same data as the holotype; 3 females, Shirahama, 4. x. 1963 (Y. Hirashima, ELKU), 7. x. 1963 (Y. Hirashima, ELKU); 2 females, Shirahama, Shirine, 23–27. iv. 2004 (T. Mita, RMPC); 6 females, same locality as the holotype, 18. v. 2007 (R. Murao, RMPC), 20. v. 2007 (R. Murao, RMPC), 21. v. 2007 (R. Murao, RMPC); 1 female, TBRC campus, 7. iv. 2004 (H. Hannan, MCDS); 1 female, Ushiku-mori, 3–7. xi. 1963 (G. A. Samuelson, ELKU).

Type depository. The holotype and 29 paratypes are deposited in ELKU, and seven paratypes in MCDS.

Figures

FIGURE 9. Lasioglossum (Evylaeus) latifacies Murao, sp. nov. A – F: holotype, female. G – I: paratype, female. A: lateral habitus. B: lower face. C: mesoscutum. D: sculpture on mesoscutum. E: mesoscutellum. F: mesepisternum. G: labrum. H: propodeal dorsum. I: inner hind tibial spur. Scale bars: H, 0.5 mm; G, 0.2 mm; I, 0.1 mm.

FIGURE 4. A, B: Lasioglossum (Evylaeus) bicornutum Murao, sp. nov. C, D: Lasioglossum (Evylaeus) silvicolum Murao, sp. nov. E, F: Lasioglossum (Evylaeus) latifacies Murao, sp. nov. A – F: holotypes, females. A, C, E: head in frontal view. B, D, F: first metasomal tergum (left half, sculpture; right half, hair pattern). Scale bar: 1 mm.