248 GEO. H. HORN, M. D. 



the fourth. Legs rather short, tibiaj slightly broader to tip, outer 

 edge rounded, posterior terminated by a short spur, tarsi stout, chiws 

 appendieulate at base. Elytra striato-punctate ; surface glabrous. 



The antennce are dissimilar in the sexes. In the male they are 

 more than thi'ee-fourths and in the female shorter and more slender. 



This genus was instituted by Crotch for two species, one of which 

 cannot remain, in such a brief and unsatisfactory manner that it 

 would not be possible to refer it with certainty to any group, except 

 by inference from the position in which it was placed in the paper. 



It is closely related to Crepidodera, and differs especially in the 

 form of the ante-basal groove and the very long antennae dissimilar 

 in the sexes. The form is similar to Pseudepitrix, but more convex. 



Two species are known to me which may be separated in the fol- 

 lowing manner : 



AntenuiB rather stout in both sexes; punctures of striie confused on eacli side of 

 scutellum; ante-basal impression moderately deep, but not sharply im- 

 pressed; color usually piceous or brownish; front punctate copaliiia. 



Antennse slender (in both sexes?) ; striie entire, not confused near the scutellum ; 

 ante-basal impression deep and sharply defined ; color pale rufotestaceous ; 

 front smooth iiieiiiia. 



O. copaliiia. Fab. — Elongate parallel, moderately convex, shining, brownish 

 or piceous, in the latter case the head and thorax paler. Antennse rufotestace- 

 ous. Head shining, coarsely punctate, front ratlier flat. Thorax one-half wider 

 than long, base scarcely broader than apex, sides arcuate, more distinctly in 

 front, margin finely serrate, disc convex, the punctuation coarse and deep, but 

 not dense, ante-basal sulcus moderately deep, feebly arcuate, joining the basal 

 margin near the hind angles. Elytra distinctly broader than the thorax, hu- 

 meri rather prominent, umbone distinct, limited within by a slight depression, 

 disc convex, with nine strife of coarse, closely placed punctures, the outer distant 

 from the margin, those of the inner series confused near the scutellum, intervals 

 narrower than the striae and slightly convex. Body beneath colored as above. 

 Abdomen with very few punctures. Legs rufotestaceous. Length .08— .10 inch. ; 

 2—2.5 mm. 



In the male the antennse are rather more than three-fourths the 

 length of the body, first joint stout, clavate, second conical, more 

 slender, half as long, third and fourth equal, a little longer than 

 second, fifth distinctly longer than either fourth or sixth, joints 6-10 

 very gradually shorter and slightly stouter, eleventh one half longer 

 than the tenth, acuminate at ti|). 



In the female the antennne are about half the length of body, 

 rather more distinctly thickened toward tip; joints 1-2 as in male, 

 third as long as second, but more .slender, joints 4-10 shorter than 

 third, equal in length, eleventh longer and acuminate. 



