On Aquatic Carnivorous Coleoptera or Dytiscide. 443 
The only two specimens I have seen are no doubt males, though the front tarsi 
are but slender. The coxal lines are very nearly parallel in this species. 
North America. (ex Mus. Dejean.) 280. 
514. Hydroporus vitiosus, Lec., M.C.—Ovalis, sat elongatus, fere depressus, parce 
pubescens, sat nitidus, ferrugineus, prothorace basi elytrisque obscurioribus, his 
signaturis rufis vagis, sat crebre sed vix fortiter punctatis, coxis posterioribus sat 
fortiter et sat crebre punctatis. Long. 3%; lat. vix 2 m.m. 
The only individual I have seen is no doubt a male, though the front tarsi are 
quite slender ; according to Crotch the female is “very closely punctate.” 
The species is closely allied to H. proximus, but is more elongate and depressed, 
and has the punctuation of the hind coxze less, and the coxal lines more divergent 
at their apex. 
North America. 281. 
515. Hydroporus vittatus, Lec., M.C.—Ovalis, parcius tenuiter pubescens, niti- 
dulus, testaceus, prothorace antice et postice elytrisque fuscis, his vittis duabus 
longitudinalibus testaceis, sat crebre subtiliter punctatis; prothorace tenuiter 
marginato ; coxis posterioribus sat fortiter fere sparsim punctatis. Long. 4, lat. 
24 m.m. 
The only individual I have seen is a male, it has the front and middle tarsi 
moderately dilated, and the claws of the front ones unequal, the anterior being a 
little shorter and thicker. The coxal lines are a little divergent both in front and 
at the extremity. 
North America ; (Fort Laramie). 283. 
516. Hydroporus sericeus, Lec., M.C.—Ovalis, minus elongatus, testaceus, pro- 
thorace antice et postice elytrorumque vittis fuscis ; prothorace omnino tenuiter 
marginato ; coxis posterioribus dense sub-fortiter punctatis. Long. 4, lat. 22 m.m. 
The only individual I have seen is a female, the upper surface bears a dense fine 
yellow pubescence, and the sculpture is quite obsolete. The coxal lines are scarcely 
divergent at the apex. 
North America, (Lake Superior ; Illinois sec. Crotch). 284. 
517. Hydroporus dimidiatus, Har., M.C.—Ovalis, densius brevissime pubescens, 
opacus vel subopacus, testaceus, elytris lineis hinc inde przesertim ante apicem 
dilatatis et conjunctis nigvis ; densius subtilius punctatis ; prothorace margine haud 
tenui; coxis posterioribus dense fortiter punctatis. Long. 4, lat. 24 m.m. 
TRANS. ROY. DUB. SOC., N.S., VOL. II. SEM 
