On Aquatic Carnivorous Coleoptera or Dytiscide. 349. 
infuscato; elytris nigro-fuscis, fascia lata interrupta sub-basali, maculaque magna ante- 
apicali testaceis ; elytris cum thorace dense, distincte, fere equaliter punctatis ; coxis 
posterioribus crebre fortiter punctatis ; clypeo anterius marginato. Long. 2, 
lat. 13 m.m. 
North America. 138. 
257. Hydroporus plicipennis, Crotch, Tr. Am. Ent. Soc. IV, p. 388.—Oblongo- 
ovalis, sat latus, fere opacus, brevissime pubescens, fuscus, thorace testaceo, basi et 
margine anteriore fuscis ; elytris fascia lata, interrupta, sub-basali, et macula magna 
ante-apicali testaceis, cum thorace equaliter dense et distincte punctatis, sutura 
sat elevata, disco plica longitudinali, lata, elevata ; antennis pedibusque obscure 
rufis ; pectore rufo, dense fortiter punctato ; clypeo anterius marginato, Long. 2, 
lat. 1¢ m.m, 
The only specimen I have seen is a male, and has the front and middle tarsi 
rather strongly dilated. 
California. 139. 
258. Hydroporus flavicollis, Lee., M.C.—Oblongo-ovalis, opacus, brevissime evi- 
denter pubescens, testaceus, elytris fuscis, fasciis latis duabus interruptis testaceis ; 
elytris cum thorace densissime subtiliter punctatis, coxis posterioribus crebre fortiter 
punctatis. Long. 13, lat. 1 m.m. 
The outline of this peculiar little species is much that of Dytiscus duo- 
decempustulatus, (No. 462) ; in the male the front and middle tarsi are distinctly 
dilated : the hind tibise seem to approximate to those of Deronectes and Hydropovus ; 
in the only individual I have been able to examine the wings are abortive, so that 
this will probably prove to be a very distinct and important species. The hind tibize 
seem to make a link between Bidessus and Deronectes ; in the specimen I broke 
up, the wings as stated were undeveioped. 
North America, (Illinois, Pennsylvania, Massachusetts). 141. 
259. Bidessus obesus, n. sp.—Latus, ovalis, convexus, brevissime pubescens, fere 
opacus, obscure testaceus, elytris obsolete fusco-signatis, thorace et elytris dense 
subtiliter, equaliter punctatis ; coxis posterioribus dense fortiter punctatis ; clypeo 
minus distincte marginato. Long. 2, lat. 13 m.m. 
This species is similar in appearance to Hydroporus cribrosus, Schaum, (No. 242), 
but the upper surface is much more densely, finely, and evenly punctured. The 
‘male has the front and middle tarsi distinctly dilated. 
North America, (Texas). 142. 
222 
