200 GEO. H. HORN, M. D. 



the statement that an ante-basal impression is present, and to admit 

 an exception in which the most conspicuous species are included 

 would be, at least, confusing. 



Two genera are known to me as occurring in our fauna : 



Thorax with an oblique sinuatiou each side of base; prosternum moderately 

 separating the coxse aud not depressed between them ; second joint of an- 

 tennae much shorter than third Disonyclia. 



Thorax regularly arcuate at base; prosternum very narrow between the coxse 

 and depressed between them ; second joint of antennse very little shorter 

 than third Heiiiiphryiius. 



The latter genus is instituted for Fhrynocepha intermedia Jacoby 

 and some allied forms which cannot remain as placed. Fhrynocepha, 

 having piUchella as the type, has broadly sulcate and bicarinate hind 

 tibi?e, and must be placed in the Aspicelites. It is I'emarkable that 

 so obvious a character should have escaped notice. 



DISONYCHA Chev. 



Head inserted as far as the eyes, front declivous, frontal carina 

 distinct, sometimes acute, joining the thickened border of the clypeus 

 in front, above the end of the carina are two tubercles usually well 

 marked, separated by a tine line. Antenme slender, rarely longer 

 than half the body, the fourth joint longer than the third, except in 

 the species with blue elytra, where they are about equal. Thorax 

 as wide at base as the elytra, narrowed in front, the apex truncate, 

 or feebly emarginate ; anterior angles not prominent, base either 

 rounded at middle or slightly emarginate opposite the suture, the 

 sides obliquely sinuate, although at times feebly ; disc convex, with- 

 out distinct ante-basal transverse depression in any of our species. 

 Scutellum triangular, broader than long. Elytra oblong, or oval ; 

 the epipleuriB gradually narrower from base to apex. Prosternunj 

 variable in width between the coxse, usually narrow, the cavities 

 open behind, angulate externally, exposing the trochantin. Meta- 

 sternal side pieces moderate in width, with parallel sides. Legs 

 moderate, posterior thighs fusiform, grooved beneath ; tibiae more or 

 less distinctly bisulcate on the outer face without trace of sinuation 

 or tooth above the tarsi, terminated by a moderate spur (Plate VII, 

 fig. 16). Tarsi slender, moderately long, the first joint of the pos- 

 terior pair as long as the next two ; claws appendiculate at base. 



