456 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Nebraska (locality unknown) ; one specimen, in Dr. Horn's collection. 



This species and the three following belong to a division of Dr. Horn's 

 group L, with A. poliUis, characterized by having the base of the 

 prothorax not margined. The species are separated mainly bj' the 

 I)unctuation of the prothorax and the degree of flattening of the sides. 



20. Aphodius marginatus, n. s;p. 



Elongate, cylindrical, of the same size and form as A. hrevicoUis, black, 

 shining; elytra dark brown. Head not tuberculate, finely punctured, 

 epistoma broadly emarginate, angles very obtase and rounded, sides 

 oblique, explanate, and reflexed : genae prominent, rounded at tip. Pro- 

 thorax twice as wide as long, sides strongly margined, nearly straight, 

 front and hind angles rounded, base bisinuate, not margined: surface 

 deeply but not very coarsely punctured, punctures more distant towards 

 the middle. Scutellum sparsely punctured. Elytra at the base nar- 

 rower than the prothorax, strise punctulate, interspaces slightly convex, 

 sparsely but distinctly punctulate. Mesosternum opake, alutaceous, not 

 carinate. Spinules of hind tibiae unequal. Length S'^'^ (0.30 inch). 



Eastern Nevada ; one specimen, in the collection of Dr. Horn. 



21. Aphodius phjeopterus, n. sp. 



Of the same form as A. cruentatus, but differs by the gense being more 

 prominent, and much less rounded, and by the vertex more distinctly 

 elevated at the middle ; by the punctures of the prothorax being more 

 numerous, and the sides being more distinctly flattened along the mar- 

 gin, especially near the front angles : the base is very indistinctly and 

 imperfectly margined. The color is piceous, with the sides of the head 

 and prothorax brownish. Antennae, palpi, legs, and elytra dull ferru- 

 gineous. Blytral striae well-impressed, finely punctulate, interspaces 

 slightly convex, obsoletely sparsely punctured. Mesosternum flat, 

 opake, finely alutaceous, not carinate. Spinules of hind tibiae unequal. 

 Length 7™"" (0.28 inch). 



Atlanta, Idaho, (7,800 feet) ; one specimen, given me by Mr. Eeinecke. 



22. Aphodius cruentatus, w. sp. 



Elongate, convex, shining black, elytra dark dull red, legs very dark 

 brown. Head not tuberculate, but with the vertex slightly elevated, 

 very finely punctulate, clypeus very broadly and feebly emarginate in 

 front, angles obtuse, much rounded, sides broadly flattened, feebly 

 punctured, reflexed edge very narrow ; genae rounded. Prothorax nearly 

 twice as wide as long, sides broadly rounded, especially in front of the 

 middle; base rounded, slightly bisinuate, finely margined; at the sides 

 near the base is a small shallow impression ; disc finely punctured, with 

 somewhat larger jjunctures intermixed more densely at the sides and 

 along the base. Elytra deep red, striae finely punctured, interspaces 

 slightly convex, scarcely perceptibly punctulate. Mesosternum opake, 



