llo COLEOPTERA OF NORTH AMERICA. 



Ill all of our species, except in those of Myzia, the claws are 

 broadly toothed, or appendiculated. The epipleural character 

 seems of but little value, the extension to the sutural tip is 

 nearly as distinct in Anisocalvia as in Psyllobora. 



Group III.— Chilochori. 



This is one of the best defined groups in the family, and is at 

 once recognized by the antennae being inserted under lateral 

 dilatations of the front. The body is also remarkable in form, by 

 the very small size of the prothorax, which is deeply emarginate 

 in front, and rounded behind, by the great convexity of the elytra, 

 which extend laterally beyond the body, with very broad con- 

 cave epipleurse, extending to the sutural tip. The under surface 

 of the sides of the prothorax is also deeply concave, and the 

 metasternal and first ventral curved lines are well defined. The 

 legs are short, and moderately retractile, the thighs sulcate 

 beneath for the partial I'oception of the tibi«, which are deeply 

 .sulcate externally for the reception of the tarsi : claws appendi- 

 culate. 



There are l)ut two genera, each represented on both sides of 

 the continent : — 



/Vnterior tibiae witli a small tooth on the outer margin ; lahrum not \-\:<i- 



blc. Chilocorus 



Auterior tihia? without tootli ; lahrum apparent. Exochomus. 



Group IV. — Hyperaspes. 



In this grouj) the contractile power of the glabrous Coccinellse 

 reaches the greatest development. The species are of small, or 

 very small (Cryptognaiha, Pentilia) size : the antenme are inserted 

 upon the front, at the anterior margin of the eyes, and are very 

 short. The body is hemispherical, compact; the prothorax emar- 

 ginate in front, rounded behind, sufficiently concave beneath to 

 receive the front legs. The elytra are convex, not dilated as in 

 the preceding group, but with narrow epipleune not I'eaching the 

 tip: on the inner surface beyond the e|)iplenr;e is a strongly 

 marked ridge (as in llhynchophora, and some Buprestida?) for the 

 purpose of fixing more closely the elytra on th(( edge of the 

 abdomen : the epipleurie are usually foveate for the reception of 

 the knees of the middle and hind pair of legs : the tip is occa- 

 sionally subtruncate. T''lie metasternal and first ventral lines are 



