Istiochrysis gen. nov., a new chrysidid genus from Oriental China (Hymenoptera, Chrysididae) Author Rosa, Paolo Author Feng, Jun Author Xu, Zai-Fu text Zootaxa 2016 4111 5 591 597 journal article 39042 10.11646/zootaxa.4111.5.5 c748b3ea-936c-4b08-b383-8562550266a5 1175-5326 263662 C4F0DD2F-4230-4E05-8236-CFE78DDF26EE Key to the genera related to Trichrysis Lichtenstein 1. Genital capsule with aedeagus bearing longitudinal crest ( Figs 1A–1 C); S2 with large black spots connected to lateral margins of sternum ( Fig. 3 B). Oriental species..................................................... Istiochrysis gen. nov. - Genital capsule without subsidiary structure ( Figs 1 D–1F); S2 with small black spots distinctly separated from lateral margins of sternum ( Figs 3 C, 3D)................................................................................ 2 2. Genital capsule with articulate gonostyle ( Fig. 1 F); female scapal basin laterally with fovea or depression.—Nearctic and Neotropical species.............................................................. Caenochrysis Bohart & Kimsey - Genital capsule with gonocoxa not subdivided and without articulate gonostyle ( Figs 1 D, 1E); female scapal basin without depression or fovea................................................................................... 3 3. Fore wing discoidal cell complete; apex of T3 with three teeth, sometimes lateral tooth like simple angle; black spots on S2 usually medially fused, or nearly so, only separated by thin metallic line; gonocoxa of genital capsule with unmodified apex ( Fig. 1 D).–Palaearctic and Oriental species)............................................... Trichrysis Lichtenstein - Fore wing discoidal cell usually incomplete with outer veins faint; apex of T3 usually medially rounded or sinuous between two lateral teeth or angles, rarely with median tooth; black spots on S2 usually separated by 1–2 MOD; gonocoxa of genital capsule with bilobed apex ( Fig. 1 E).–Palaearctic, Oriental and Afrotropical species.................. Chrysidea Bischoff