On Aquatic Carnivorous Coleoptera or.Dijtisckhv. 595 



the male tarsi are less dilated, and the fine aciculations or scratches on the elytra 

 of the female are even less conspicuous, so that they can he scarcely said to be 

 present. 



South America, (Cayenue). 625. 



895. Colymbetes sulcipennis, Cast., M.C. — Ovalis, subdepressus, niger, prothorace 

 ad angulum anteriorem, antennis pcdibusque anterioribus rufis, posterioribus nigro- 

 piceis ; prothorace crebre profundequo strigoso ; elytris singulo striis undecim basi 

 perprofuudis, ad apicem fere continuatis, aliaque ad marginem exteriorem anterius 

 abbreviata. Long. 9, lat. 4| m.m. 



The male of this species has the three basal joints of the front and middle tarsi 

 greatly dilated ; and the interstices of the elytra quite smooth ; in the female the 

 interstices, except the three or four sutui-al ones, bear e.xtremcly fine scratches or 

 aciculations, these however are confined to the basal portion. 



8oiitli America, Cayenne. 624. 



Group 1 4. (No. 896). 



Elytra with a subraarginal stria, and twelve other striae on each. 



In this interesting species the striation of the elytra attains its maximum ; the 

 strife are very regular and equidistant and deej), except that at the apex there are 

 some detached fragments, which strongly suggest that this species has arrived at 

 its perfect striation by a development from a condition similar to that still existing 

 in No. 847 (C. interruptus). 



896. Copelatus aubei (Montr, forte), M.C. — Ovalis, sat depressus, niger, capite 

 prothoracisque lateribus piceo-testaceis, antennis pedibusque rufescentibus ; capite 

 transversim in medio prothoraceque ,strigulis brevibus profundis; elytris striis 

 duodecim per-profundis, vix ad apicem disintegratis, aliaque margiuali anterius 

 abbreviata. Long. 5h, lat. 2f m.m. 



This species is very distinct by the coarse sculpture of the upper surface. The 

 male is not easy to distinguish from tlic female, there being no differences of 

 sculpture, and the front and middle tai-si are only obscurely incrassate (not 

 dilated). Montrouzier's description can scarcely l^e cited as the authority for the 

 name of this insect. 



New Caledonia. 679. 



TBANS. KOT. DUB. SOC, N S , VOL. ]I. 4 H 



