40 " STUDIES IN NORTH AMERICAN MEMI3R ACID.45 



species is very close to borealis Fairm. but the metopidium is 

 flat or even a little convex between the suprahumerals, thus 

 giving it somewhat the appearance of a small bubalus. The 

 dorsal outline is also more like that of the bubalus being more 

 arcuated with the attenuated apex more depressed than in 

 borealis. The clypeus is more strongly produced than in that 

 species and the vertex is very conspicuously striate. Here the 

 apical sinus of the last ventral segment of the female has an 

 abrupt and rounded apex and almost attains the base of the 

 segment. In borealis this sinus is acutely pointed. In the 

 males the disk of the sternum and the venter, excepting the 

 genital pieces and the slender edges of the segments, are black. 

 In the female this black color is sometimes barely indicated. 



Dr. Ball has just sent me, among other interesting Memb- 

 racids, a male of this species taken by Prof. Wickham at Carson 

 City, Nevada, in which the suprahumerals are a little shorter 

 than in those from California. 



12. Ceresa brevis Walker. PI. i, figs. 35,36. 



In August 1888 I took at Gowanda, N. Y. two females that 

 I identify as Walker's brevis but with some doubt. These 

 are larger, have the pronotum more elevated and the supra- 

 humerals shorter than they really should be to match with his 

 description The face is large, unusually smooth, with conspic- 

 uous vertical striae between the ocelli and eyes. They are 

 marked with black exactly as described by Walker bat the 

 pronotum is dotted with pale green on fulvous ground, a con- 

 dition however often found in other species. Here the ultimate 

 ventral segment of the female is short with a broad shallow 

 sinus and short median notch about as in bubalus. Three 

 males taken by me in Colorado I have doubtfully placed as the 

 other sex of this species They differ from the females des- 

 cribed above in being smaller with the suprahumerals reduced 

 to obtuse angular projections. The peculiar characters of the 

 face, the elevated pronotum and the arrangement of the black 

 color beneath are identical. Further material from both 

 localities must be studied before their identity can be decided. 



13. Ceresa brevicornis Fitch. PI. 1, fig. 37. 



In this species the suprahumerals are small and bluntly 

 triangular as in brevis but the metopidium is broader, the 



