2,6 STUDIES IN NORTH AMERICAN MEM BRACID.E 



diceros but may readily be distinguished by the whitish face 

 and metopidium, its more acute and recurved suprahumerals, 

 the longer and black-tipped pronotal apex, the shorter tylus, 

 the shorter plates in the male, the form of the last ventral seg- 

 ment of the female, and the almost hyaline elytra. 



3. Ceresa bubalus Fabr. PI. 1. fig. 26. 



Our largest native species of Ceresa and one of the most 

 abundant and widely distributed. It has large ■ triangular 

 suprahumerals with the metopidium flat between them. The 

 last ventral segment of the female is a little more oblique than 

 in albescens and rounded on either side of the shorter and more 

 obtuse median notch. The plates of the male are broad and 

 attain the tip of the anal tube. Mr. Marlatt has published an 

 excellent account of this insect in Insect Life, vol. 7, pp 8-14, 

 with a very good figure giving details. He however represents 

 the last ventral segment of the female as more deeply cleft 

 than in any specimen I have seen. It is common throughout 

 the eastern United States and southern Canada, and extends 

 its range west through Colorado and Utah to California. 



4. Ceresa brevity lus n. sp. PI. 1, fig. 13. 



Allied to basalis Walker. Male : Pronotum about as in borealis 

 Kairm. a little higher than in basalis; smooth, the metopidium convex, its 

 sides rising high above the head, divergent and nearly rectilinear to the 

 short subacute suprahumeral horns which point outward and backward: sur- 

 face evenly punctured with a strong median carina; semicircular impression 

 deep; anterior margin deeply but regularly sinuated, not subangulate near 

 the eyes as in the allied species; the callosities strongly distinguished. 

 Head unusually large and smooth, very closely and evenly rastrate-punctate; 

 anterior margin of the cheeks regularly convexly arcuated, almost attaining 

 the apex of the tylus; the latter large, reaching about one half way to the 

 base of the head; at apex scarcely longer than the cheeks and loree, and, 

 when viewed from before, truncated and obtusely and feebly emarginate. 

 Last ventral segment very short; plates of the male broad, quite regularly 

 narrowing to the obtuse apex which hardly attains the tip of the pygofers; 

 their surface feebly convex, not at all carinate. Color fulvo-testaceous 

 tinged with green in places, doubtless clear green in life, more or less strongly 

 marked with black on the pectoral pieces and femora. Elytra subhyaline, 

 faintly clouded toward their apex. 



Described from two males taken at Jamesburgh, N. J. 

 June 19th, and sent to me by Prof. J. B. Smith. From Prof. 

 Sherman I have received a specimen that I believe to be the 



