Lasioglossum (Sudila) semiruginosum Zhang et Zhu

Zhang, Rui, Li, Qiang, Niu, Ze-Qing & Zhu, Chao-Dong, 2011, A newly recorded Subgenus Sudila from China with description of two new species (Hymenoptera: Halictidae: Lasioglossum), Zootaxa 2937, pp. 31-36 : 34-36

Lasioglossum (Sudila) semiruginosum Zhang et Zhu , sp. nov.

( Figs. 9–14 )

Diagnosis. This species can be distinguished from all other Sudila species by the following combination of characters: body black; hairs very sparse; sculpture coarse, especially on mesoscutum; genal margin round, eye a trifle wider than genal; basal 1/2 of propodeal dorsum with longitudinal ridges.

Description. Female. BL= 6.5 mm. Body black without metallic tint; apical of mandible, wing vein dark brown; tegula, tarsus except basitarsus brown; tibial spur fawn; wing brown and transparent. Hairs whitish and sparse; apical of clypeus with a raw simple, pale yellow brown bristles; eye with glabrous hairs; tibia, basitarsus and apical of T5 with yellowish brown hairs; scopa well developed.

Head nearly as long as wide. Labrum with basal tubercle. Clypeus anterior margin truncate; clypeal tooth mild, anterior with fastigiated punctures become longitudinal furrows; punctures on supraclypeal area coarse, IS= 1; sculptures on ocellocular area disɭΓibuɭed uneven, IS= 0.5–2; punctures on frons area coarse, IS= 0.25; frontal carina distinct, upward exceeding the anterior ocellus lower margin; inner upper margin of eyes concave, lower convergent; scape attaining the lateral ocellus. Frontal view of head as in Fig. 9 . seen laterally, gena margin round ( Fig. 10 ), EW: GW= 9: 8, with longitudinally striate; HL: HW= 66: 67; IOD: OOD: Od: OCD= 11: 13: 7: 6; UOD: MOD: LOD= 49: 54: 37; scape L: pedicel L: F1L: F2L: F3L: F4L: F5L: F6L: F7L: F8L: F9L: F10L= 33: 6: 5: 2: 3: 4: 5: 5: 6: 6: 7: 9; F2L: F2W= 3: 7. Antenna as in Fig. 11 .

Mesoscutum and scutellum with coarse punctures, IS= 1–2 ( Fig. 15 B); medianmesoscutal line and parapsidal line distinct; mesepisternum finely granular, upper area with transverse striation, lower area with a mild but characteristic tubercle ( Fig. 12 ); metepisternum, lateral surface of propodeum with transverse striation; propodeal dorsum truncate apically, basal 1/2 with longitudinal ridges as in Fig. 13 and Fig. 15 D; not separated with carina from lateral and posterior surface; MCL: MTL: PDL= 32: 13: 15.

WL= 5.5 mm. Fore wing with veins 1r-m, 2r-m, 2m-Cu and M-b narrower than Rs-a and M-a; 2m-Cu and M-b narrower than 1r-m; hamuli arranged in 2-1-2.

Basitibial plate elongate oval, apically pointed; inner hind tibial spur with 5 distinct, fastigiated, pectinate teeth ( Fig. 14 ).

Metasoma elongate oval. Posterior areas of T1–T5 straightforwards, the wrinkle not obvious. T1 fine and sparsely punctures on anterior area nearly smooth, middle area IS= 2; T2, T3 and T4 IS= 2–3, anterior area coarser than posterior areas; T5 IS= 1; T6 hidden in T5 below, with U-shaped pygidial plate; sting L= 0.35 mm.

Male. Unknown.

Type material. Holotype, Ƥ, China, Hainan, Baisha County, Nankai Down, 19°13ʹN 109°42ʹE, 249m, 21 November 2008, Rui Zhang. Paratypes, 1Ƥ, China, Hainan, Ledong County, Jianfeng Mountain, 18°74ʹN 108°86ʹE, 828m, 20 May 2009, Rui Zhang; 1Ƥ, China, Hainan, Baisha County, Hongkan Damsite, 19°08ʹN 109°50ʹE, 516m, 18 November 2008, Rui Zhang; 1Ƥ, China, Hainan, Ledong County, Jianfeng Mountain, 18°74ʹN 108°86ʹE, 828m, 21 May 2009, Rui Zhang.

Type series were deposited in the Insect Collections of Institute of Zoology, Chinese Academy of Sciences, Beijing, China.

Distribution. China (Hainan)

Etymology. The name semiruginosum is derived from the Latin semi- (= semi-) and Latin ruginosum (= ridges), basal 1/2 of propodeal dorsum with longitudinal ridges.

Figures

FIGURES 15. Lasioglossum (Sudila) genotrigonum Zhang et Zhu, sp. nov. (A, C) and L. (S.) semiruginosum Zhang et Zhu, sp. nov. (B, D), both holotypes, female. A, B: Mesoscutum; C, D: Propodeal dorsum.

FIGURES 9 – 14. Lasioglossum (Sudila) semiruginosum Zhang et Zhu, sp. nov., holotype, female. 9, frontal view of head; 10, lateral view of head; 11, lateral view of antennal; 12, lateral view of mesepisternal tubercle; 13, propodeal dorsum; 14, inner hind tibial spur. Scale line for figure 9 – 13, 0.5 mm; for 14, 0.25 mm.