Aivalykus Nixon, 1938

Head subcubical; ocellar triangle with base larger than its sides; frons more or less flat and without median keel; eyes glabrous; occipital carina present, usually reduced below and not fused with hypostomal carina; postgenal bridge narrow; palpi formula 5-3; scape wide and short,without apical lobe; neck of promesosoma short, slightly convex dorsally; anterior surface of mesonotum subvertical, distinctly raised above pronotum; notauli more or less deep in anterior half, shallow or rarely absent in posterior half; sternaulus shallow, long and straight; prepectal carina distinct and complete; postpectal carina absent; propodeum with or without marginate areas; lateral tubercles and propodeal bridge absent; fore tibia with small spines arrange almost in single row; hind coxa small, without basoventral corner and tooth; all femora without dorsal protuberances; hind basitarsus 0.65-0.9 x as long as segments 2-5 combined; fore wing marginal cell slightly shortened; r-m absent; 1m-cu antefurcal or postfurcal; 1cu-a present, usually postfurcal; 3CU interstitial; first subdiscal cell closed apically; hind wing cu-a absent; subbasal cell absent; m-cu absent; basal cell narrow and closed; RS arising from R; marginal cell without r, first metasomal tergite wide, with dorsope; acrosternite about 0.2 x as long as first tergite; second suture shallow and straight or absent; second tergite without furrows or defined area; ovipositor long [1].

Body length, 2.5-8.0 mm; hind coxa rounded or broadly angled but without distinct antero-ventral basal tooth; fore tibia with row of 6-8 stout spines along anterior edge, 4-6 stout spines at apex; middle tibia with row of 4-5 stout spines along anterior edge; fore wing vein r-m absent, first subdiscal cell closed either by vein 2cu-a being present or vein 2-1A meeting 1CU before 1m-cu, vein 2CU on same line as 1CU, vein 1cu-a present; hind wing vein cu-a absent, vein 1A short and indistinct; first metasomal segment with basal sternal plate short, less than 0.25 length of tergum, dorsope distinct and deep; male metasoma often elongated, often more than twice as long as mesosoma, due to telescoping and extension of segments 4-7 [2].

References