Isegama sinica Li & Xu

Li, Shuang-Shuang & Xu, Zai-Fu, 2016, First record of Isegama Krombein (Hymenoptera, Chrysididae, Amiseginae) from China, with description of a new species, Zootaxa 4189 (1), pp. 189-195 : 190-192

Isegama sinica Li & Xu , sp. nov.

( Figs 1–10 )

Material examined. Holotype: ♀, CHINA: Guangxi, Nanning, Shanglin , Longshan Nature Reserve (23°24'72''N, 108°31'91''E), 1–2.VII.2011, leg. Zaifu Xu ( SCAU) . Paratype: 1♂, CHINA: Guangxi, Nanning, Shanglin, Longshan Nature Reserve (23°24'72''N, 108°31'91''E), 1–2.VII.2011, leg. Zaifu Xu ( SCAU) ; 2♀, CHINA: Hainan, Bawangling National Nature Reserve (19°7'31''N, 109°14'6''E), 7–11.VII.2006, leg. Jingxian Liu & Liqiong Weng ( SCAU) ; CHINA: Yunnan, Gaoligongshan National Nature Reserve (25°50'23''N, 98°51'23''E), 16–17.VII.2006, leg. Jie Zeng, Juanjuan Ma & Bin Xiao ( SCAU) .

Diagnosis. Body without metallic tints ( Figs 4 , 6 , 8, 10 ); F1–F11 black with ventral side blackish-brown; head width 1.13 × as height in frontal view ( Fig. 5 ); vertex slightly convex ( Fig. 5 ); gena with genal carina ( Figs 1 , 3 ); pronotum shorter than mesoscutum in median length; dorsal surface of metapectal-propodeal complex with pair of polished and impunctate enclosures about as long as wide ( Figs 4 , 8, 9 ).

Description. Holotype ( Figs 1–7 ). Female. Body length 4.9 mm; forewing length 2.9 mm; MOL=2.0 MOD; MS=3.0 MOD; OOL=0.4 MOD; POL=2.0 MOD; SD=0.6 MOD; relative length of F1:F2:F3=10.0:5.0:6.0.

Head. Head width 1.13 × as height in frontal view ( Fig. 5 ); face and vertex polished with sparse and small punctures, 1.0–3.5 PD apart; vertex slightly convex ( Fig. 5 ); ocellar triangle obtuse isosceles; eyes bulging and with short microtrichiae, not encircled by carina; scapal basin moderately concave, with polished median stripe and short transverse rugulae laterally; sides of lower face strongly converging; clypeus short, rounded apically; F1 2.5 × as long as wide; F2 0.6 × as long as wide; F3 0.8 × as long as wide; F11 2.3 × as long as wide.

Mesosoma. Relative ratio of median length of pronotum, mesoscutum, mesoscutellum and metanotum=5.5:7.0:3.0:3.0; pronotum slightly convex, polished with sparse and small punctures about 1.0–3.0 PD apart; mesoscutum polished with sparse and small punctures about 1.0–3.0 PD apart; mesopleuron with dense and large punctures about 0.5–1.0 PD apart on anterior two-third, with sparse and small punctures about 3.0–5.0 PD apart on posterior one-third; scrobal sulcus straight and parallel-sided; mesoscutellum polished with sparse and small punctures about 1.0–3.0 PD apart; metanotum polished with sparse and small punctures about 1.0–3.0 PD apart, median enclosure with pair of anterior pits; metapleuron polished with fine ridges below hind wing; metapectal-propodeal complex with strong transverse carina between dorsal surface and posterior surface; dorsal surface polished with pair of impunctate enclosure areas; posterior surface rugose with polished longitudinal median carina.

Metasoma. T1–T2 polished with dense and small punctures about 0.5–1.5 PD apart, with impunctate longitudinal median stripe ( Fig. 6 ); T3–T4 polished with dense and small punctures about 0.5–1.5 PD apart.

Color. Head, mesosoma and metasoma black, without metallic tints; scape and pedicel reddish-brown; flagellomeres black with ventral side blackish-brown; mandible reddish-brown, apex dark brown; coxae dark brown, trochanters, tibiae and tarsi yellowish-brown, femora with outer surface dark brown and inner surface reddish-brown.

Variations. Female paratypes ( Figs 8–10 ). Body length 4.8–5.0 mm; forewing length 2.8–3.0 mm.

Male. Body length 5.1 mm; forewing length 3.1 mm. Characteristics as in female expect MS=4.0 MOD, SD=1.0 MOD, relative ratio of median length of pronotum, mesoscutum, mesoscutellum and metanotum=6:7:3:3.

Distribution. Oriental part of China (Guangxi, Hainan, Yunnan).

Etymology. The new species name is referred to the type locality, China.

Figures

FIGURE 1. Isegama sinica sp. nov., ♀, holotype, habitus, lateral view.

FIGURES 2 – 4. Isegama sinica sp. nov., ♀, holotype. 2. Antennae, head and pronotum, dorsal view; 3. Antennae, ventral view; 4. Head and mesosoma, dorsal view.

FIGURES 5 – 7. Isegama sinica sp. nov., ♀, holotype. 5. Head, frontal view; 6. Metasoma, dorsal view; 7. Forewing.

FIGURES 8 – 10. Isegama sinica sp. nov., ♀, paratype from Hainan. 8. Head and mesosoma, dorsal view; 9. Metanotum and metapectal-propodeal complex, postero-dorsal view; 10. Metasoma, dorsal view.