BUFFALO SOCIETY OF NATURAL SCIENCES 39 



broad triangular median notch. Mr. Palmer took a series of 

 males in North Carolina that differ only in being smaller with 

 the suprahumerals more acute and recurved, thus forming a 

 transition to Palmer i. The only female in the North Carolina 

 lot differs from the form noted above in having the hind margin 

 of the last ventral segment of the female broadly excavated 

 with the sides oblique and sinuated. Other examples with 

 about the same form of ventral segment I have taken at Ham- 

 burg, N. Y., and Ogden, Utah. I do not care to separate them 

 without more material. 



10. Ceresa basalis Walker. PI. i, fig. 34. 



This species like the last is subject to much variation and 

 is difficult to delimit. In the palest females the lower 

 surface and disk of the femora above are black while in the 

 darkest males the whole surface is deep shining black with the 

 middle and edges of the face, tibiae and tarsi, brown and the 

 elytra smoky hyaline becoming black toward their base. In all 

 the metopidium is transversely flat or nearly so, as in borealis 

 and bubalus, but here the suprahumerals are triangular and 

 horizontal, not distinctly elevated as in borealis like which 

 species the surface is covered with short stiff hairs. In basalis 

 the last ventral segment of the female is short, not surpassing 

 the sixth connexival segment, with its hind margin broadly 

 and deeply excavated almost from the lateral angles to the base, 

 the sides of this sinus rectilinear or nearly so. 



This species is very abundant throughout northern New 

 York, New England and Canada, where it attains its deepest 

 black color. Westward it occurs through Colorado and Sask- 

 atchewan to the Selkirk Mts. in British Columbia. Dr. Goding 

 has redescribed the pale form as Ceresa turbida and Prof. 

 Osborn an intermediate form as Ceresa melanogaster (Bui. Nat. 

 Hist. Lab. Iowa State Museum, II, p. 390, 1803). Stictocephala 

 semi-brunnea Buckton seems to be the same in so far as one can 

 judge from his description or figure. 



11. Ceresa albidospara Stal. 



In the Cornell University collection are two males and 

 four females taken at Palo Alto, California, in May 1892, that 

 agree in every particular with Stal's short description. This 



