118 GEO. H. HORN, M. D. 



in the maxillary palpi are also shown. Fig. 15 is a more enlarged view 

 of a portion of the under side. It will be observed that the structure 

 of the legs and antennae is decidedly Elmide, that of the under side 

 recalls strikingly some Dascyllidae. Psephenus seems to be a genus 

 with Elmide affinities pointing strongly in the direction of the Eubriide 

 series of Dascyllidae. 



LARA Lee. 

 At the time of the description of this genus, the only specimen 

 known was imperfect, having but three basal joints of the antennae 

 remaining. Having recently received a perfect specimen the outline 

 on plate VI, fig. 16, has been prepared with the view of illustrating the 

 missing organ and of giving a general idea of the species. The antennae 

 are rather long, scarcely at all serrate, first joint stouter, second oval 

 much shorter, 3 — 11 subequal. The legs and tarsi do not differ notably 

 from those of Psephenus. 



ONITI€EL,L,US Serv. 



O. caliloniicilS n. sp. — Oblong, black, feebly shining, elytra more opaque. 

 Thorax broad, emarginate in front, sides and base arcuate, surface with very 

 coarse punctures, regularly but not densely placed, the intervals with finer punc- 

 tures, a slight depression in front of the scutellum. Elytra finely seven-striate, 

 striae with punctures not closely placed, intervals opaque, very finely alutace- 

 ous and irregularly biseriately punctate, each puncture with a very fine hair. 

 Pygidium opaque, sparsely punctate. Body beneath shining, coarsely punctate. 

 Length .54 inch; 13.5 mm. 



Male. — Head broad ; clypeus expanded at the sides, slightly prolonged at middle 

 and arcuate in front, bearing a moderately long, slightly arcuate horn which is. 

 feebly emarginate at tip, behind the horn the head is smooth; occiput transversely 

 carinate and with a short compressed horn at middle; sides of head coarsely punc- 

 tured. Thorax convex, anteriorly with a broad but shallow depression behind 

 which is a small smooth tubercle. (PI. VI, figs. 3 — 4). 



Female. — Head oval, coarsely punctured ; clypeus nearly semicircular, obtusely 

 bidentate in front; vertex with a short obtuse horn situated immediately between 

 the eyes; occiput with a transverse carina on a line with the posterior border 

 of the eyes. Thorax regularly convex, more coarsely punctured than the male, 

 without the anterior concavity but with a slight tubercle at middle behind the 

 anterior margin. 



The genus Oniticellus is closely related to Onthophagus and differs 

 in having the antennae eight-jointed and by the presence of a very 

 distinct scutellum. This is the first instance of the occurrence of the 

 genus in our fauna, in fact there is but one other, from Cuba, in the 

 Western Hemisphere. 



For this interesting addition we are indebted to Mr. Henry Edwards, 

 who collected but one pair at the base of Mount Shasta, California. 



