174 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



border moderately arcuate; apical border slightly rounded and feebly 

 sinuate just external to the apical lobe, the latter small and trian- 

 gular; internal border broadly arcuate. The apical margin has a 

 feAV long set?e. 



Appendage rather short and transversely semi-elliptical, fijiely 

 setose, and equal in width to the outer two-thirds of the dorsal plate. 

 Fossa transverse and narrow. 



Basal pr'ominenees not evident. The external border is angulate 

 at the base. 



SupeHor jjxdimdal 7nemhrane reaching to the middle of the dorsal 

 plate, finely and more or less regularly longitudinally rugulose. 



Ventrolateral surfaces are evenly and moderately convex, glabrous. 

 The snbmarginal grooves are very broad beneath the explanate ex- 

 ternal borders of the dorsal plates. Each curves inward around to 

 the inner lobe of the apex, so that the apical margin appears explanate 

 when viewed from below; surface very sparsely punctate and setose; 

 genital fissure very narrowly fusiform. 



Habitat. — Texas. Specimens without definite locality labels and 

 collected by C. V. Kiley, others by Hubbard and Schwarz are the 

 largest in the series before me. One specimen from Dallas is also 

 large and Avell developed. A pair collected in Bexar County by 

 Charles Drury agree in size with other examples from this State. 

 Many years ago I received similar specimens that were collected in 

 Bosque County by G. W. Belfrage. — Wyoming. Specimens taken at 

 Cheyenne b,y H. Soltau are the smallest specimens before me. Two 

 specimens with indistinct labels, but apparently from this locality, 

 are larger and moderate in size. Dr. George Horn stated that this 

 species is never very abundant, and also as occurring on the plains 

 of Nebraska and southward into New Mexico. — Kansas (Wallace- 

 W. Kuans). Professor Wickham, in his "List of the Coleoptera 

 of Colorado," writes that it occurs at Bellevue, and at La Junta on 

 authority of Bowditch. 



Number of specimens studied, 24. 



The type in the LeConte collection bears a green disc label, and 

 was prol)ably collected in Colorado, in the Platte River Valley, near 

 Fort Laramie. 



Salient type-characters. — Fusiform. Thorax trapezoidal, narrow- 

 ing anteriorly; posterior angles rounded with the base; anterior 

 angles acute; disc finely punctate. Elytra with base emarginate, 

 clasping the base of the ))rothorax; humeri anteriorly produced; 

 disc rather densely subser-iately punctate. Antenna* slightly incras- 

 sate. l^rosternum produced (LeConte). 



Diagnostic characters. — Distinguished from all of the other species 

 of the subgenus — except opaca — by the mutic anterior femora. From 



