1L8 THE CANADIAN ENTOMOLOGIST. 



7. Paler stridulator composed of pegs ranging from bristles to short 



"peg-tops," the transition gradual 6, Glcenocorisay Thomson. 



7a. Paler stridulator never with bristles, although the " pegs " may be 



elongate (not to be confused with the lower fringe of bristles. .(8). 



S. Asymmetry on right side (9). 



8a. Asymmetry on left side. Pronotum and tegmina smooth, 



shining 9, Corixa, Geoffroy. 



9. Tegmina with short, black hairs (immaculate, 



nonlineate) 8, Agraptocorixa, Kirkaldy. 



9a. Tegmina without short black hairs 7, Arctocorisa, Wall. 



A. Pronotum transversely lineate, generally rostrate ; tegmina 



more or less rostrate (B). 



AA. Pronotum immaculate, smooth ; tegmina smooth, 



polished subg. 3, Hesperocorixa, nov. 



B. Tegminal hairs normal, tibiae ( ^ ) rarely produced 



triangularly subg. i, Arctocorisa, s. str. 



BB. Tegminal hairs of two sorts, tibiae ( ^ ) triangularly produced 

 {iy^Q pyg?fi(Ea, Fieber) . . ..subg. 2, Tric/iocorixa, nov. 



10. Face flattened (n)- 



I oa. Face convex (14)- 



1 1. Pronotum immaculate ; face smooth 4, Cymatia. 



1 la. Pronotum with impressed transverse lines ; face 



hairy 6, Glceiiocorisa. 



12. Pronotum immaculate (i3)- 



12a. Pronotum lineate (14)- 



13. Tegmina with short black hairs 8, Agraptocorixa. 



13a. Tegmina not with short black hairs . . (subg.) Hesperocorixa. 



14. Pronotum and tegmina smooth, shining 9, Corixa. 



14a. Pronotum and tegmina more or less rostrate (^S)- 



15. A conspicuous black spot usually on hind tarsi 5, CalUcorixa. 



15a. Hind tarsi pale, fringing hairs dark in some species. . 7, Arctocorisa. 



A. Tegminal hairs normal Arctocorisa, s. str. 



A A. Tegminal hairs of two sorts (subg.) Tric/iocorixa. 



I do not know the Brazilian Heterocorixa^ White, of which the types 



are apparently lost. 



Arctocorisa, Wallengren. 



This genus was originally founded for certain species with a percurrent 

 pronotal keel {Cari?iata, etc.), which, however, are scarcely even sub- 

 generically separable from Linnei, fossarum, etc., so that it has been 



