250 CALIFORNIA ACADEMY OF SCIENCES. 



parallel, evenly and very feebly arcuate throughout, not at all constricted at 

 base; apex broadly, very feebly and evenly emarginate throughout its width; 

 angles slightly acute, very narrowly rounded; base transversely truncate and 

 straight throughout its width; angles nearly right, not rounded; disk broadly, 

 feebly convex, more strongly so near the sides, not very densely covered with 

 rather fine, flat, somewhat indefinite tubercles. Scutellum large, triangular, 

 feebly, rather densely asperate. Elytra equal in width to the prothorax; 

 sides parallel, nearly straight, abruptly transversely truncate behind; outer 

 angles narrowly rounded; disk scarcely one-fifth longer than wide, very 

 slightly longer than the head and prothorax together, depressed in the mid- 

 dle, rather convex at the sides, finely, feebly, not very densely asperate; 

 asperities not definitelv arranged. Abdomen with four fully exposed seg- 

 ments, the fifth, the basal, also being almost completely exposed; together 

 as long as wide; outline parabolic; surface rather convex, rather finely, not 

 densely, very feebly asperate or subgranulose, margined laterally with a flat 

 border, becoming attenuated posteriorly; last segment as long as the three 

 I)receding together, rounded at apex. Legs rather short and robust. Length 

 0.9 mm. 



Texas; (Austin 1). 



The entire abdomen, extending under the elytra, is com- 

 posed of eight segments; the under surface is polished and 

 very feebly transversely asj)erate along the apex of each 

 segment, and the apical two-thirds of the terminal; the 

 latter at apex has a narrow, porrected, pale membranous bor- 

 der. The antennae in the type are missing with exception 

 of the two basal joints. 



The apex of the abdomen, more especially beneath, and 

 the sides of the elytra toward the base, are slightly pale. 

 The abdominal border beyond the elytra is not apprecia- 

 bly elevated, and its surface is almost continuous in con- 

 vexity with that of the upper surface; under the elytra and 

 toward the base of the abdomen it becomes thinner, deep 

 and erect. 



This species differs greatly from filicornis Fairm. in the 

 structure of the pronotum, which is not at all constricted 

 at base. 



DITAPHRUS n. gen. (Byrrbid^e.) 



Body oval, pubescent. Head deflexed, retractile; eyes large, rather coarsely 

 granulated, nearly hidden in repose, front excavated at the sides near the 



