3« STUDIES IN NORTH AMERICAN MEMBR ACID/E 



broad and deep with a rounded apex and slightly arcuated sides. 

 In this species the suprahutnerals are long and acute, sloping a 

 little upward and strongly recurved. The color shades to a 

 clear yellowish brown dorsally becoming fuscous on the carinate 

 edges. 



8 Ceresa Palmeri VanDuzee. PI. r, fig, 33. 



I have described this species in the Canadian Entomologist 

 for May 1908 from material taken by Mr. W. J. Palmer of 

 Buffalo in the region about Lake Temagami and Quinz Lake in 

 northern Ontario. It is very close to borealis Fairm. as I now 

 determine that species but is smaller and more slender and 

 differs in having the humeral horns more terete and acute, the 

 sinus of the last ventral segment of the female less abrupt and 

 the sides more nearly rectilinear, the plates of the male narrower 

 and more slender toward their apex where they are laterally 

 compressed and the stiles distinctly shorter than the plates. 

 Cornell University has an example of this species taken at 

 Ithaca and Prof. J. B. Smith has sent me an example taken at 

 Hebron, N. Y. 



In July 1890 Mr. Palmer collected at Mt. Balsam, N. C, 

 a Ceresa that is intermediate between this species and borealis 

 as found in New York, Ohio, Kansas and Colorado. It is just 

 possible that these three forms will eventually have to be 

 united as varieties of one species but that cannot be done with 

 the material now at hand. 



9. Ceresa borealis Fairmaire. PI. 1, figs. 8,32. 



All writers since Fairmaire's time have placed this name 

 as a synonym of bitbahis but his description cannot be so con- 

 strued as to fit any specimen of that species. It certainly refers 

 to a smaller and darker species and must be applied either to 

 this species or the paler specimens of basalts I prefer to apply 

 it here and believe later investigations will uphold this decision. 

 In this species, which is abundant throughout New York State 

 and is found in Canada, Ohio, and Kansas, as represented in 

 my collection, the outer angles, of the last ventral segment of 

 the female are a little longer than the sixth segment of the 

 connexivum and are rounded; the hind margin is slightly 

 oblique and feebly rounded or truncated either side of the 



