AMERICAN IMIILOSOPHICAL SOCIETY. 015 



1. n. UNDULATUs. — Ferruj^inous ; elytra trifasciate witli black. 

 Length about three-twentieths of an inch. 



Dijtiscus iindulatits Melsh. Catal. 



Body ferru'^'inous, very numerou.s, minute, villous punctures', 

 hairs adpressed to the surface ; head destitute of large, indented, 

 frontal punctures ; antennae and palpi ])alcr ; thorax at base and 

 tip black, lateral edge very slightly anjuatcd ; elytra, suture and 

 three undulated irregular bands black, of the latter, one is basal, 

 one central, and the other subtenninal. 



The bands sometimes occur dilated and decurrent, so as to 

 form a common black disk to the elytra. 



[Also described subsefjuently as 7/. /(f.st/'<//«s Harris ; tiie % i.>* 

 II. puhijicnnis, and the 9 JI- velutimis Aube. — Lec] 



2. H. orrosiTUS. — Blackish ; head and base of the thorax 

 ferruginous ; elytra with six whitish marginal spots or subfascia. 



Length rather less than three-twentieths of an inch. 



Body with very numerous, villous, minute punctures, hairs 

 adpressed to the surface ; head rufous or ferruginous, four or 

 six indented, frontal, distant punctures ; thorax ferruginous, 

 black at tip, about three indented punctures, placed transversely; 

 elytra black, each with an irregular humeral spot, another placed 

 upon the margin behind the jniddle, and a third apical one yel- 

 lowish, edge yellowish ; postpectus and venter blackish or deep 

 piceous; pectus and feet yellowish-testaceous. 



This was sent to me as a distinct species by Dr. J. F. Mcl- 

 sheimer. It is very like luitlalittus. 



[This seems to be the species afterwards described as H.proxi- 

 mxis Aub6. — Lec] 



3. 11. NIGER. — Black, villous, obscure, immaculate ; head and 

 lateral margins of the thorax and elytra obscure rufous. [103] 



Length more than three-twentieths of an inch. 



Dydscus niger Melsh. Catal. 



Body black, obscure, very numerous, minute, villous punctures, 

 hairs adpressed to the surface ; head ob.scure rufous, paler be- 

 neath, dusky each side of the front, a slightly indented spot 

 each side before instead of the impressed line and punctures ; 

 antonnnc dusky towards the tip of each of the terminal joints ; 

 palpi, terminal joints blackish ; thorax black, very obscure rufuus 

 1823.] 



