Corixidae, Leach, 1815

Key to genera and species of Corixidae View in CoL from Pará

(adapted from Hungerford 1948; Nieser 1970)

1a. Head, in lateral view, with posterior margin of eye almost straight; hypo-ocular suture arising near midway along posterior margin of eye ( Fig. 9A View FIGURES 9–13 ); apices of clavi not exceeding a line drawn through nodal furrows of hemelytra in females and slightly exceeding in males ( Fig. 9B View FIGURES 9–13 ); male protibia strongly produced apically over pala ( Fig. 9C View FIGURES 9–13 ); male abdomen without prestrigil, with sinistral asymmetry and strigil on the left side ( Fig. 9D View FIGURES 9–13 )................... Trichocorixa orinocoensis Sailer, 1948 View in CoL

1b. Head, in lateral view, with posterior margin of eye concave; hypo-ocular suture arising from posteroventral angle of eye ( Fig. 10A View FIGURES 9–13 ); apices of clavi distinctly exceeding a line drawn through nodal furrows of hemelytra in both sexes (10B); male protibia not produced over pala ( Fig. 11A, 12A View FIGURES 9–13 ); male abdomen with prestrigil on dorsal segment V, with dextral asymmetry and strigil on the right side ( Fig. 11B, 12B, 13A View FIGURES 9–13 ) ( Heterocorixa White, 1879 View in CoL ).............................................. 2

2a (1b). Mesopretarsal claw at most as long as respective tarsus; hemelytra lacking short spines on corium; metaxyphus as long as or longer than inner line of metacoxae ( Fig. 10C View FIGURES 9–13 ); metafemur with little more than basal end pilose, with no more than 10–12 spines on ventral side; male with long prestrigilar comb and median lobe of tergum VII rounded ( Figs. 11B, 12B View FIGURES 9–13 )........ 3

2b. Mesopretarsal claw longer than respective tarsus; hemelytra with both slender setae and short spines on corium, hemelytral pattern very fine; metaxyphus with half the length of inner line of metacoxae ( Fig. 13B View FIGURES 9–13 ); metafemur pilose on basal two-fifths, with many spines on ventral side; male with short prestrigilar comb and median lobe of the tergum VII triangular ( Fig. 13A View FIGURES 9–13 )................................................................ Heterocorixa hesperia hesperia ( White, 1879) View in CoL

3a (2a). Posterolateral margin of head slightly sinuate; male protibia with a long flap resting in a depression of the pala ( Fig. 11A View FIGURES 9–13 ); posterior pruinose area of the embolar groove a little longer than that of claval suture; left paramere not strongly hooked apically ( Fig. 11C View FIGURES 9–13 )................................................... Heterocorixa boliviensis Hungerford, 1928 View in CoL

3b. Posterolateral margin of head slightly convex, not sinuate; male protibia without a flap as described above but with a carina on caudal side ( Fig. 12A View FIGURES 9–13 ); posterior pruinose area of embolar groove considerably longer than that of claval suture; left paramere strongly hooked apically ( Fig. 12C View FIGURES 9–13 )................................... Heterocorixa chapadiensis Hungerford, 1928 View in CoL