A newly recorded Subgenus Sudila from China with description of two new species (Hymenoptera: Halictidae: Lasioglossum) Author Zhang, Rui Author Li, Qiang Author Niu, Ze-Qing Author Zhu, Chao-Dong text Zootaxa 2011 2937 31 36 journal article 46492 10.5281/zenodo.203940 7a510553-ae3c-4027-81a8-646b361dc60d 1175-5326 203940 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. 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. 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. 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. 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.