438 On Aquatic Carnivorous Coleoptera or Dytiscide. 
The coxal cavities are distinctly not contiguous, and the coxal lines are very 
little divergent in front. 
North America, (Canada, Illinois, Nebraska, fide Crotch). 291. 
498. Hydroporus pulcher, Lec., M.C_—Oblongo-ovalis, parcius subtiliter pubes- 
cens, vix nitidus, obsolete haud dense punctatus, rufescens, subtus infuscatus 
pectore apice medio dilutiore, supra prothorace (medio excepto) elytrisque fuscis, 
his fascus latis, vagis, interruptis testaceis ; elytris stria suturali distincta; coxis 
posterioribus minus crebre, sat fortiter sed subobsolete punctatis. Long. 33, lat. 
vix 2 m.m. 
I do not know the sex of the only individual I have seen. The coxal cavities 
are evidently not quite contiguous; the coxal lines are very little divergent 
in front. 
North America, (Pennsylvania). 289. 
499. Hydroporus integer, n. sp.—Oblongo-ovalis, subtiliter pubescens, vix nitidus, 
obsolete punctatus, fuscus, subtus pectore apicem versus, capite, antennis pedi- 
busque, etiam prothorace medio et lateribus rufescentibus, elytris fascia vaga 
sub-basali signaturisque externis testaceis ; coxis posterioribus minus crebre, sat 
fortiter sed sub-obsolete punctatis. Long. 3%, lat. 2 m.m. 
I do not know the sex of the only individual I have seen. The coxal cavities 
are evidently not quite contiguous ; the coxal lines are more divergent in front 
than they are in H. pulcher, to which species H. integer is extremely similar. 
North America, (Pennsylvania). 299. 
500. Hydroporus vittatipennis, Har., M.C.—Ovalis, subtiliter pubescens, nitidulus, 
testaceus, elytris vittis plurimis elongatis plus minusve confluentibus fuscis, obsolete 
punctatis ; coxis posterioribus obsolete punctatis; prothorace margine laterali 
tenuissimo. Long. 3, lat. 1) m.m. . 
I do not know the sex of the only individual I have seen of this species, the front 
tarsi are small, their third joint but little developed. The species in most points 
of iss structure appears allied to H. concinnus, Lec. (No. 497) although it has the 
lateral margin of the thorax very fine even in front ; the coxal cavities are distinctly 
not contiguous. 
This species was described by Leconte under the name of H. lineolatus, but the 
name has been changed by Harold on account of the prior H. lineolatus, Boh. 
North America. 292. 
