39G G. R. CROTCH, M. A. 



J. — Above glabrous, elonqate, extremely, minutely and sparingly punctulate. 

 II. COiiciilHUS, Lee. Pr. Acad., 1855, p. 297, 55 ; pulcher, Lee. 1. c. n. 56. 

 Very distinct by the glabrous apparently impunctate surface. H. 

 pulcher is not specifically distinct. Canada. Illinois, Nebraska. 



K. — Glabrous, elongate, antennae of % thickened in the middle. 

 H. couoitleus, Lee. Lake Sup., p. 216.— Elongate, wedge-shaped, unequal- 

 ly and sparingly punctate, beneath nearly smooth. L. '2 inch. 

 Lake Superior, Canada, Vancouver. 



H. difformiS, Lee. Pr. Acad., 1855, P . 298. 



Larger than preceding and equally, though still, sparingly punc- 

 tate. Georgia, Boston. (Harris.) 



H. aulicus, Aitoe", Spec, vi., 572. — Alutaceous. brow, head, thorax and two 

 interrupted fascia* on the elytra reddish-orange. L. -17 inch. 



Tennessee. Distinct from any Hydroporus that I am acquainted 

 with by the distinct groove on the anterior portion of the meta- 

 sternum. 



L. — Slightly pubescent, very deeply and sparingly punctate, elytra with two smooth 

 longitudinal spaces. 



H. striatopunctatus, Mels. Pr. Acad, ii., 28. — Very distinct by the 

 peculiar sculpture; it is rufescent and deeply punctate beneath; above black 

 ■with yellow markings. L. \13 inch. 



Middle States. 



Tribe 3. — Nbterini. 

 HYDROCANTHUS, Say, Tr. Am. Phil, ii., 105. (Type tricolor.) 

 Labial palpi with the last joint securiform, very large; anterior 

 tibiae with a strong spur; thorax margined; prosternum flat, broad, 

 truncate behind ; metasternum short, laciniae triangular, episterna 

 reaching the coxae; posterior femora short, apical margin strongly 

 ciliated, tibise short, smooth, claws equal. 



H. iricolor, Say, 1. c, p. 105. — Ovate, convex, attenuate behind, rufo-tes- 

 taceous ; elytra piceous ; the three dorsal series of punctures evident, irregular. 

 L. -16— -20 inch. 



Pennsylvania, Georgia, Louisiana. I have only seen one species 

 from the United States; Say's R. atricoldr was described from 

 Mexico, and probably equals //. nigrinus, Aube\ The North Ameri- 

 can species is also noted from the West Indies and Senegal ! 



SUPII1S, Aube", Spec, vi., p. 412. (Type cimicoides.) 

 Very near to Jlydrocanthus, but maxillary palpi with the apex bifid. 



