458 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



geuse prominent, slightly rounded. Frothorax about twice as wide as 

 long, densely punctured, punctures larger towards the sides, which are 

 rounded at base and near the front angles, with a faintly impressed 

 dorsal line behind the middle : disk broadly explanate at the sides, 

 which are finely margined; base finely margined, slightly bisinuate^ 

 Scutellum brown, slightly concave. Elytral strise impressed, punctured, 

 interspaces slightly convex, distinctly puuctulate ; mesosternum flat, 

 opaque, alutaceous, carinate near the coxie. Spinules of hind tibite 

 much worn, but apparently unequal. Length S.Q"""^ (0.34 inch). 



Colorado; one specimen, collected by the Scientific Expedition of 

 the University of Kansas, given me by Prof. F. H. Snow. This is a 

 fine species, easily distinguished by the flattened sides of the prothorax 

 and the carinate mesosternum. The tubercles of the head are very 

 faint, and indicate that it should be placed near group I of Dr. Horn. 

 The color gives it a superficial resemblance to A. nibriijennis Horn, but 

 the characters are very dilferent. 



26. Aphodius rudis, n. sp. 



Elongate, cylindrical, chestnut-brown, shining. Head punctulate,not 

 tuberculate; epistoma broadly and feebly emarginate in front, angles 

 dentiform acute, sides nearly straight, oblique, flattened, finely margined, 

 sparsely fimbriate with short stiff setee ; gense prominent, subacute. 

 Prothorax more than twice as wide as long, sides slightly rounded, flat- 

 tened, and strongly margiue;], obliquely truncate and sinuate near the 

 base, which is also slightly bisinuate and not margined ; surface finely 

 punctulate, and with large shallow punctures, which are absent from a 

 transverse space extending from the front margin for one-fourth the 

 length, prolonged backwards along the middle to within one-fourth of 

 the base ; there are also two small smooth spaces at the basal margin. 

 Elytral strise finely punctured, interspaces nearly flat "and smooth, 

 humeri rounded, not dentiform. Mesosternum strongly and densely, 

 punctured, not carinate. Spinules of hind tibise unequal. Length 

 (J 4mm (0 25 inch). 



Colorado ; one specimen, given me by Prof. F. H. Snow. This spe- 

 cies belongs to the same group (O) with A. ovipennis Horn, but is abun- 

 dantly distinct by form and color, by the sides of the prothorax being 

 strongly margined, by the non-dentiform humeri, and by the more 

 coarsely punctured mesosternum. The two following species belong to 

 the same group, and may here be conveniently described, though they 

 do not occur in the same zoological province. 



27. Aphodius sparsus, n. sp. 



Elongate, subcylindrical, black, shining. Head finely punctulate, with 

 a few small punctures intermixed ; epistoma broadly emarginate in front, 

 angles broadly rounded, sides oblique ; gense prominent, subacute. Pro- 

 thorax more than twice as wide as long, narrower behind, sides strongly 



