212 THE UNIVERSITY SCIENCE BULLETIN. 
Females. 
A. Scutellum covered by pronotum only at the anterior margin. Pro- 
notum roundly emarginate behind. Tenagobia. 
AA. Scutellum covered (except sometimes at posterior angle) by pro- 
notum. 
B. Face flattened, foveate, pale deeply furrowed. 
Ramphocorixa. 
BB. Face convex. 
C. Hind wings aborted usually. Palmacoriza. 
CC. Hind wings normal. 
D. Pronotum and tegmina smooth, shining. 
Corixa. 
DD. Pronotum and tegmina not smooth and shining. 
E. Hind tarsi pale, fringing hairs dark in some 
species. Arctocorixa. 
EE. Hind tarsi usually marked by conspicuous 
black spot. Callicorixa. 
Genus TENAGOBIA Bergroth 1899. 
Minute species never over 5 mm. long. The scutellum is covered by 
the pronotum only at the anterior margin, and the pronotum is roundly 
emarginate behind. One species, Pacific. 
Genus CALLICORIXA White 1873. 
Three species of bugs, all from Alaska, are in our list. The scutellum 
is covered, except sometimes at the posterior angles by pronotum. Strigil 
is absent. A stridular area is present. The hind tarsi usually marked > 
conspicuously with black. Three species, all from Alaska. 
Genus CORIXA Geoffrey 1762. 
Pronotum and tegmina are smooth and shining. The male asymmetry 
is on left side. Strigil is present. Scutellum is covered (except sometimes | 
at posterior end) by pronotum. Palar stridulator never with bristles, al- — 
though the “pegs” may be elongate. 
Genus RAMPHOCORIXA Abbott 1912. . 
Peculiar in the sexual dimorphism of the head, the male very acumi-— 
nate, the female normal. See plate XXVII. The asymmetry is right and 
strigil minute. The pronotum is lenticular rastrate. The male pale are 
dorsally deeply cleft, much longer than tibiw, and terminated by a long 
serrated spine. Femur with large stridular area or of minute spines. 
Face of the female foveate. 
Genus PALMOCORIXA Abbott 1912. 
“Body elongate, tegmina tapered posteriorly, with vermiculate mark-— 
ings. Male pale thin, plate-like, pegs variable. Large stridular area 
* The writer’s insertion. 
