378 Annals Entomological Society of America [Vol. X, 



Section II. 



The species of Ilololeptince are all black, elongate and more or 

 less flattened, with a large projecting head which is more or less 

 retractile, but not depressible; the mandibles are long and 

 projecting, subequal and not crossing, except in Oxysternus, 

 in which the left mandible is longer than the right and crosses 

 it when closed. Labrum short, arcuate on each side of the 

 median notch, viewed from above; excavated in front from 

 b^low; closes the mouth by being apphed to the anterior edge 

 of the mentum, into the emargination of which it exactly fits; 

 the maxillae are inserted behind the mentum, their palpi lying 

 in grooves on the mandibles. The prosternum is unlobed, 

 although in certain of the genus Hololepta there is an impressed 

 line dividing the prosternum into two parts, the anterior of 

 which simulates a lobe. The propygidium is horizontal, or 

 slightly depressed. 



Key To The North American Hololeptinae. 



Prosternum not carinatc, rounded or truncate anteriorly. Teeth on middle 

 and hind tibiae unequally spaced, the two lower arising from the same 

 process, more distant from the upper than from each other. .C7enus Hololepta 



Prosternum flattened, broadly rounded anteriorly Subgenus Hololepta 



Prosternum elevated, narrower at apex and often truncate .. Subgenus Leionota 

 Prosternum carinate, terminating apically in a sharp point. Teeth of hind 

 and middle tibiae, rising from different processes, equally spaced, long, 

 spiniform Iliotona n. g. 



Genus Hololepta Payk. 



Elongate, flattened. Head porrect, mandibles subequal. 

 Tibiae dentate, the anterior quadri-, posterior and intermediate 

 tridentate, the two lower teeth of the intermediate and posterior 

 tibiae borne on the same process, closer to each other than to 

 the upper tooth; on the intermediate tibiae there is also, in 

 some species, a small additional tooth at the base of the upper 

 and middle crests. 



SUBGENUS HOLOLEPTA. 



Strongly depressed, elongate. Prosternum very broad and 

 flat ; anterior margin broadly rounded. A fovea-like impression 

 behind the eyes; supraorbital stria entirely lacking. In our 

 forms there is always a transverse line on the prosternum about 

 one-third of the distance from apex to base. 



