212 THE UNIVERSITY SCIENCE BULLETIN. 



Females. 

 A. Scutellum covered by pronotum only at the anterior margin. Pro- 

 notum roundly emarginate behind. Tenagobia. 



A A. Scutellum covered (except sometimes at posterior angle) by pro- 

 notum. 

 B, Face flattened, foveate, palse deeply furrow^ed. 



Ramphocorixa. 

 BB. Face convex. 



C. Hind wings aborted usually. Palmacorixa. 



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. Arctoeorixa. 



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 palas are 

 dorsally deeply cleft, much longer than tibiae, 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 palas thin, plate-like, pegs variable. Large stridular area 

 on femur. Metathoracic wings aborted in both sexes (usually*). Male 



* The writer's insertion. 



