CHARLES SCHAEFFER. 255 



tions on each side are much smaller, in form of a conical tubercle, and the whole 

 surface is more densely punctate than in the male. 



The elytral strise have an impressed line and relatively small rounded punc- 

 tures which are not closely placed. Length, male, 18 mm. ; female, 20 mm. 



Huachuca Mts., Arizoua. 



This species is readily distinguishable from remotus and machus 

 by the sides of thorax oblique in front, not sinuate near the front 

 angles, the larger size, the form of median prothoracic protuberance 

 of male and the relatively small rounded punctures of elytral strise, 

 which are rather transverse in mcechus and remotus. With the 

 Mexican species, having the sides of thorax near front angles not 

 sinuate, it can only be compared with klugi, the male of which is 

 said to have the thoracic fovese and disk smooth, and the female the 

 posterior part of thorax smooth. 



Small males and females o? laaxhus have the thorax more densely 

 punctate than the larger specimens. 



Baron Harold,* in the table given of the Mexican species, has 

 separated a small number from the rest of the species, which have 

 the sides of thorax very near the front angles sinuate, which gives 

 these a tooth like appearance. This character is very evident in 

 good preserved examples, but can also be traced in old worn speci- 

 mens. The following table, which I prepared from Dr, Horn's 

 material in Philadelphia for my own use, is given below with the 

 hopes that it may prove useful to others in the identification of the 

 North American species : 



TABLE OF THE SPECIES OF COPRIS. 



1. Sides of thorax near apical angles sinuate 5. 



Sides of thorax near apical angles not sinuate 2. 



2. Underside of thorax, at sides in front of the transverse carina, strongly decli- 



vous, smaller species, about 9-11 mm. .3. 



Underside of thorax, at sides in front of the transverse carina not or feebly 

 declivous, larger species, 15-20 mm 4. 



3. Head, thorax and elytra smooth or very feebly ohsoletely punctured, impressed 



basal marginal line almost impunctate, clypeal horn of male sliort. 



conical goplieri Hubbard. 



Head at sides and thorax rather coarsely punctured, elytral intervals finely 

 punctate, impressed basal marginal line coarsely punctured, clypeal 

 horn of male elongate minutus Drury. 



4. Thorax with a deeply impressed and coarsely punctured median line, male 



with two frontal horns, the posterior one small, projecting obliquely 

 forward prociduus Say. 



* Ann. See. Ent. Fr., 1863, p. 494. 



TEANS. AM. ENT. SOC. XXXII. .iUGU.ST, 1906. 



