Illustrated key to genera and catalogue of Mymaridae (Hymenoptera) in America north of Mexico Author Huber, John T. Author Read, Jennifer D. Author Triapitsyn, Serguei V. text Zootaxa 2020 2020-05-12 4773 3 1 411 journal article 22231 10.11646/zootaxa.4773.1.1 d1ca4b58-0fd8-4bcb-8f81-12fc2c106b55 1175-5326 3821373 B1D8D67C-4FDC-477E-872F-E8BCD4D027FB GONATOCERUS Nees, 1834 ( Figs 452–466 ) Gonatocerus Nees, 1834: 192 . Type species: Gonatocerus longicornis Nees, 1834 , by monotypy. Diagnosis . Body length 640–1665 μm. Funicle with fu 2 and fu 3 usually the longest segment and often fu 2 with apex slightly oblique ( Fig. 457 ); fore wing relatively narrow and as setose behind venation as beyond venation, with the microtrichia fairly dense ( Figs 452 , 464 ); stigmal vein with apex oblique ( Fig. 464 ); dorsellum rhomboidal ( Fig. 458 ), often with margins slightly lighter in colour laterally than medially; propodeum without submedian carinae ( Fig. 458 ), but sometimes with faint converging sulci. FIGURE 452 . Gonatocerus rivalis Girault , habitus. Canada, Ontario, Buckham’s Bay West, 45°29'36"N 76°6'38"W, v–x.2010, J. Read. Scale bar=500 μm. Discussion . Among the four genera in the Gonatocerus group ( Cosmocomoidea , Gastrogonatocerus , Gonatocerus , and Lymaenon ) that share the following combination of features: tarsi 5-segmented, funicle 8-segmented, face with subantennal sulci, and parastigma with hypochaeta about midway between proximal and distal macrochaetae ( Huber 2015a ), Gonatocerus is superficially most similar to Lymaenon , but the pronotal lobes abut medially and the dorsellum is triangular as in Cosmocomoidea and Gastrogonatocerus but in contrast to Lymaenon . Nearctic hosts . Hemiptera : Cicadellidae . Important references . Girault (1929 [428]), Huber (1988, 2015a, 2017), Triapitsyn et al. (2010), Triapitsyn (2013a , b).