WICKHAM: NEW MIOCENE COLEOPTERA FROM FLORISSANT. 453 
SCARABAEIDAE. 
OXYOMUS NEARCTICUS, sp. nov. 
Plate.-7,. fig. 1. 
Form oblong-oval, moderately stout. Head roughly and coarsely 
punctured, clypeus broadly arcuate, not angled nor emarginate. 
Prothorax broader than long, sides arcuate but not sufficiently well 
preserved to admit of exact description, disk with coarse, close, deep, 
eribrate punctures which are circular or elliptical in outline and leave 
a well-defined, nearly straight but narrow, almost cariniform median 
longitudinal line. Scutellum triangular. LElytra broader behind the 
middle, conjointly rounded at tip, strongly costate, the costae nar- 
row, alternate ones better defined, .the intervening grooves, which 
represent the striae, each with a row of strong, deep, transversely 
elliptical punctures. The stronger costae appear to reach the elytral 
tips, while the weaker are somewhat abbreviated apically. Legs 
moderately stout, but none are sufficiently perfect for description. 
Length, 3.20 mm. 
Described from a single specimen. 
Type.— No. 2,528 M. C. Z. Florissant, Col. (No. 222 S. H. 
_Seudder Coll. ). 
The small size, coarse cephalic a thoracic sculpture, and costate 
elytra lead me to place this pretty aphodiide in Oxyomus. The genus 
is now known in North America only from the introduced European 
0. porcatus. I have compared the fossil with European specimens of 
O. silvestris, received years ago from Dr. Natterer, and find that the 
former differs in having a morevstrongly punctate head, the median 
thoracic line not sulcate, and the elytral costae much more distinctly 
alternating in height. Both agree in the possession of a vague ante- 
median lateral pronotal impression. The coarse sculpture distin- 
guishes O. nearcticus at once from all of the other Florissant Aphodiini. 
ATAENIUS PATESCENS Scudder. 
Seven specimens are assigned here, bearing the No. 2,529-2,535 
M. C. Z. (No. 8,411, 8,571, 10,160, 10,408, 11,796 S. H. Scudder 
Coll., and two in which the numbers are illegible or wanting). I 
here included under this name all the aphodiids of a little over 4 mm. 
