234 [March, 



concave, epistoma -with two rather large triangular teeth in front, the sutural line 

 arched ; antennary orbits prominent and somewhat angularly roimded ; the two 

 horns, placed as in E. ferrugineus, are elongate, tapering and somewhat dirergeiil 

 from the base, curred backwardly, and slightly inwardly at their summits, rather 

 broadly connected at the base by a transverse elevated ridge ; behind the horns, the 

 head is somewhat prolonged, and it is seen to be decidedly convex, the deep rounded 

 excavation behind the upper portion of each eye in E. ferrugineus is in this species but 

 faintly indicated ; prothorax minutely and not closely punctulate, strongly trans- 

 verse, sub-quadrate, very convex (almost gibbous), sides regularly and moderately 

 rounded, base rather strongly bi-sinuate ; elytra strongly sinuate at the base, scarcely 

 80 wide as the prothorax at its widest part, seriate-punctate, the punctures rather ■ 

 close together, the usual short scutellar row obsolete, intervals finely punctured, the 

 punctures arranged somewhat in lines ; anterior tibiae rather strongly serrate at 

 their outer edge from near the base, the intermediate serrate at their apical third 

 only. Long. corp. 3 lin. 



$ . Unknown. 



Sal). : "Colombia ;" one example. 



I refer this species to EiwjjJus, iiotwitlistandiiig the excavation 

 behind the eye (characteristic of the type species) is but feebly indi- 

 cated rather than existent ; but the position and character of the horns, 

 the form of the eyes, which (more especially in the^^) are narrowed 

 in their upper portion behind by an expansion of the cheeks, the 

 more regularly rounded sides of the prothorax, with its apex decidedly 

 sinuous and the angles strongly rounded, ai-e alike in both species, 

 and different from the great majority of the species in the very 

 closely related genus Jloplocejjhala (the members of which have 

 usually the vertex and occiput deeply excavated in the (J), the only 

 other genus to which the present species could possibly be referred.. 

 It is, nevertheless, a question whether, having regard to the weakening 

 of certain characters as perceived in JE. Lecontii and in H. lateralis, 

 the two genera had not better be considered as but one. 



Dr. Horn, in his recently published work (' Revision of the 

 Tenebrionida) of America, North of Mexico '), places Evoplus with 

 the Ulomicles ; and Dr. Le Conte, in his description of the genus 

 ('New Species of North American Coleoptera,' p. 128), says '^ costs 

 " mcdiis ejnsfemis arete inclusis, trochantino milloy In the four 

 examples of E. fcrrucjineus before me, I find the mesocoxal cavities 

 open externally, and the trochautin distinctly visible ; the genus is 

 therefore undoubtedly referable to the Diaferides, and must, if main 

 tained as distinct from, be placed close to, Hojilocepliala, with which 

 genus and its allies it also agrees in having the presternum very short, 

 compressed, and convex, and the head somewhat loosely fitting in 

 its cavity (apparent when viewed on the under-side). 



