446 On Aquatic Curnivorous Coleoptera or Dytiscide. 
528. Hydroporus addendus, Crotch, Tr. Am. Ent. Soc. IV, p. 393.—Ovalis, latus, 
sine pubescentia, opacus, rufescens, elytris testaceis nigro-signatis; prothorace 
anterius et posterius nigricante ; elytris seriebus punctorum rudimentalibus ; corpore 
subtus opaco, impunctato, rugis irregularibus; prosterni processu lato, obtuso. 
Long. 44, lat. 23 m.m. 
The four individuals I have seen of this species show me no sexual distinctions. 
California. 223. 
524, Hydroporus funereus, Crotch, Tr. Am. Ent. Soc. IV, p. 392.—Ovalis, 
elongatus, minus evidenter pubescens, nigricans, supra plus minusve rufo-signatus ; 
pedibus fuscis, antennis testaceis extrorsum infuscatis; corpore dense subtiliter 
punctato, subtus rugis irregularibus obsoletis ; prothorace versus latera subrugoso, 
elytris seriebus punctorum interne distinctis externe obscletis. Long. 54, lat. 3 m.m. 
I have seen only one individual which has the front tarsi broad, but the claws 
small ; I do not know its sex. 
California. 267. 
525. Hydroporus sequinoctialis, Clk., M.C.—Ovalis, sat angustus, subtilissime 
pubescens, fere opacus, nigricans, thorace lateribus et in medio testaceis, elytris 
signaturis parvis minus discretis testaceis, capite in medio indistincte fusco, pedibus 
antennisque fuscis, his basi testaceo; prothorace lateribus leviter curvatis, basi 
elytris angustiore, angulis posterioribus sat obtusis; corpore dense subtilissime 
punctato, prothorace minus «quali utrinque subrugoso, elytris seriebus punctorum 
impressorum sat profundis. Long. 4%, lat. 23 m.m. 
The individual described is a female. 
Mexico. 265. 
526. Hydroporus libens, n. sp.—Ovalis, brevis, convexus, niger, sine pubescentia, 
vertice, thoracis medio elytrisque prope basin obscure testaceo-signatis, antennis 
testuceis versus apicem fusco-maculatis, pedibus anterioribus et intermeduiis fuscis ; 
corpore obsolete punctato, quasi subleevigato, haud omnino opaco, capite thoraceque 
subnitidis, hoc basi utrinque longitudinaliter ruguloso ; elytris seriebus suturali 
aliisque discoidalibus minus distinctis punctorum impressorum. Long. 4, lat. 
23 m.m. 
In this species the punctuation of the wing-cases and undersurface is excessively 
obsolete and dense, on the head and thorax it is not so dense and they are distinctly 
shining ; the rough sculpture at the base of the thorax on each side has amongst 
it one longer stria which reaches more than half way to the front of the thorax. 
