1. Apices of hemelytral clavi not or scarcly surpassing a line drawn through the costal margins at the nodal furrows (Fig.1.1); abdominal asymmetry of males sinistral, strigil on left; foretibia of male produced over base of pala; species smaller than 5.9 mm in length. . . Trichocorixa sp.
Apices of hemelytral clavi clearly surpassing a line drawn through the costal margins at the nodal furrows (Fig.1.2); abdominal asymmetry of males dextral, strigil on right; foretibia of male not produced over base of pala (Fig.1.3); species usually longer than 5.9 mm. . . . . . . 2
2. Pruinose (frosted ) area at base of claval suture (clavopruina) short and rounded, narrowly rounded or pointed, usually about one-half to two-thirds as long as postnodal pruinose area (postnodal pruina) (Fig.1.4); clavus rastrate (Fig.1.5) (having longitudinal scratches over the surface). . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hesperocorixa sp.
Pruinose area at base of claval suture (clavopruina) either broadly rounded, narrowly rounded or pointed distally; subequal to or longer than postnodal pruinose area (postnotal pruina) (except two-thirds in Corisella, which has smooth clavus). . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Palar claw of both sexes minutely serrate (sawlike) at base; upper surface of male pala deeply incised; vertex of male usually acuminate (tapering to a point); usually with hemelytral pattern indistinct or obscure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ramphocorixa sp.
Palar claw not serrate; upper surface of male pala not deeply incised; vertex of male not acuminate; hemeelytral pattern usually distinct. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5. Posterior marginn of head sharply curved, embracing very short pronotum; interocular space much narrower than width of an eye; median lobe of male abdominal tergite VII with a hookllike projection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . Palmacorixa sp.
Posterior margin of head not sharply curved, pronotum longer; interocular space at least subequal to width of an eye; median lobe of male abdominal tergite VII without a hooklike projection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6. Pronotum and clavus smooth and shining, at most faintly ruguose (wrinkled). . . Corisella sp.
Part or all of pronotum and clavus rough, either rastrate (with longitudinal scratches) or rugose, or both. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Sigara sp.
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Key to Corixidae Genera
