AMERICAN PHILOSOPHICAL SOCIETY. f.ll 



less dilated fonn, more gradually attenuated and more acute pon- 

 terior termination of the body. 



[A species of AijahuA^ afterwards described as A. inj'usvtUuf 



Aub6 : Colymhete^ distohr Harris, is probably the same. — Lkc] 



4. C. SERIATUS, — Black, immaculate, slij^htly purple-bronzed ; 



elytra with about three irregular series of punctures on each ; 



lateral edge of the thorax somewhat rectilinear. 



Length seven-twentieths of an inch. 



Body black; immaculate, above very slightly bronzed, divided 

 into very minute, suborbicular, depressed granules, beneath black ; 

 head, a transverse frontiil puncture each side, with double, parallel, 

 obsolete, smaller ones above ; antenna) and palpi rufous ; thorax, 

 submargin slightly depressed, dorsal line obsolete, lateral and basal 

 edges nearly rectilinear, posterior angles subacute ; elytra on each 

 three irregular series of villous punctures, and a submarginal leK.« 

 distinct one; cpipleura piceous; sternum acutely carinated, depres- 

 sed behind, slightly elevated, obtuse before ; feet rufous, posterior 

 pair piceous. 



This insect was sent me as distinct by Dr. J. F. Melsheimer. 

 It is very closely allied to C. nitidux, but is considerably larger. 



[Also an Agabus described as A. stn'atus AubC', and A. arctvs 



Mels.— Leg.] [98] 



5. C. NITIDUS. — Black; elytra with about three irregular serie.* 



of punctures on each ; lateral edge of the thorax arquated each 



side. 



Length three-tenths of an inch. 

 Dytiicus nitidus Melsh. Catal. 



Body black, immaculate, polished, and divided into very minute, 

 irregularly orbicular granules, beneath black ; head, a transverse, 

 abbreviated, frontal line each side, superior punctures obsolete or 

 wanting; antenna^ and palpi rufous; thorax, dorsal line abbre- 

 viated, central, lateral edge anjuatcd, posterior angles subacute ; 

 elytra with three irregular series of villous punctures, and a sub- 

 marginal and sutural less distinct one ; cpipleura black ; sternum 

 acutely carinated, depressed behind; feet piceous, anterior onos 

 rufous. 



The chief difference between this species and the preceding one 

 appears to rest in the general form and sisse of the body, the color 

 1823.] 



