1. Tibia and tarsus of hind leg strongly compressed, thin, much broader than middle tibia and tarsus; basal segment of beak about half length of 2nd; length 40 mm or more. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lethocerus sp.
Tibia and tarsus of middle and hind leg similar; basal segment of beak subequal to 2nd; length 37 mm or less. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Belostoma sp.
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Key to Belostomidae Genera