AMERICAN PHILOSOPHICAL SOCIETY. 517 



6. H. AFFINIS.— Rufous, obscure ; a common impressed, longi- 

 tudinal line each side on the base of the thorax and elytra • 

 elytra varied with longitudinal black lines. 



Length more than one-twentieth of an inch. 



Body rufous, obscure, punctured ; thorax blackish at base and 

 in the middle, an impressed, acute line each side at base not at- 

 taining the anterior margin ; elytra with a blackish suture, base, 

 irregular submargin and intervening abbreviated lines, punctures 

 of the disk rather larger, distinct, impressed line of the middle 

 of the base of each elytron much abbreviated, obsolete. 



Differs from the preceding, to which it is very similar, in 

 having rather larger punctures on the disk of the elytra, more 

 distinct lines, and in having the impressed ones of the base very 

 short and indistinct. r 105] 



[Afterwards described as H. nanus Aube. — Lec] 



HYDROCANTHUS Say. 



Antennae rather longer than the head, somewhat thicker in 

 the middle ; scutel none ; maxillary palpi filiform ; labiales, 

 terminal joint dilated, subovate, compressed, entire; anterior 

 tibiae mucronate, tarsal joints of the male not patelliform; a 

 small pectoral scale covering the origin of the posterior feet. 



H. IRICOLOR. — Ferruginous; elytra dark reddish-brown, iri- 

 descent, attenuated behind. 



Length three-twentieths of an inch. 



Body pale ferruginous, above glabrous, impunctured, beneath 

 with villous punctures ; head obtusely rounded before ; eyes not 

 elevated above the surface; anteuna? eleven-jointed, originating 

 beneath; labrum rather large, abruptly deflected, or somewhat 

 inflected, entire ; palpi whitish ; thorax, posterior angles acute ; 

 sternum not prominent before, behind the origin of the anterior 

 feet dilated, depressed, and connate with the poststernum by a 

 rectilinear suture its whole width; poststernum dilated, depressed, 

 equilateral, concealing the origin of the intermediate feet, poste- 

 rior scales equilateral, obliquely truncate at tip, and concealing 

 the origin of the posterior feet; feet, anterior tibiae minutely 

 pectinate beneath, and terminated by a robust decurved hook; 

 1823.] 



