220 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Number of specimens studied, 150. 



Type destroyed. 



Tyfe-locality. — " Inhabits Missouri," a badly defined a^eographical 

 region in Say's day. 



Forma nupta LeConte. — Elytra with the dorsum slightly and the 

 sides strongly convex (LeConte). The elytra are more or less evenly 

 convex from one epiplenra to the other, usually somewhat inflated, 

 sometimes quite strongly so. Some of the smaller examples are quite 

 cychriform. 



Meastirements. — Males: Length, 21-27 mm.; width, 9.5-11,2 mm. 

 Females: Length, 19-29 mm.; width, 9.8-14 mm. 



Number of specimens studied, 15. 



Type in the LeConte collection. 



Type-Jocallty. — Laredo to Ringgold Barracks, Texas. 



Forma sculptilis. — Integuments didl and rather thick. Head 

 and thorax more or less shining. Elytra more or less convex, sulci 

 usually opaque and deep, with the intervals strongly conA'ex, shining 

 and conspicuous, quite abruptly limiting the grooves. 



Measurements. — il/aZes; Length, 19-23 mm.; width, T.8-8.5 riim. 

 Females: Length, 19-24 mm.; width, 8-10 mm. 



Number of specimens studied, 40. 



Forma elongata. — General form distinctly elongate and narrd^'er 

 as compared to the other forms; black. Elytra are sulcate, but less 

 strongly so than in sculptilis: the intervals at times are feebly convex. 

 The prothorax is noticeably larger and the legs stout. 



Measurements. — Males: Length, 2G.5 mm.; width, 9 mm. Females: 

 Length, 29 mm. ; Avidth, 10.2 mm. 



Number of specimens studied, 6. 



Forma convexa LeConte. — Elongate, black and bright. Thorax 

 moderately punctulate, sides rounded, anterior angles acute and 

 slightly prominent; basal angles obtuse. Elytra elongate oval, in- 

 tervals subconvex and rugose ; subacute posteriorly. 



Measurements. — Length, .9; width of elytra, .32; thorax, .23 (Le- 

 Conte). 



Specimens not at hand. 



Type is in the LeConte collection. 



Type-locality. — Prairie Paso, Texas; collector, Dr. Cooper. 



Forma laevis. — Robust, integuments decidedly black, thick and 

 alutaceous, also (juite smooth. Thorax ratlier large. Elytra usually 

 evenly convex from side to side, sulci very shallow, intervals very 

 feebly convex, subobsoletely sculptured. Legs somewhat slender. 



Measurements. — Males: I^tMigth, 23 mm.; width, 8 mm. Females: 

 Length, 23-26 mm.; width, 9.2-10 mm. 



Number of specimens studied, 8. 



