On Aquatic Carnivorous Coleoptera or Dytiscidce. 805 



" Von gestalt des H. geniculatus, aber etwas kleiner und durcli die lielleren fliigeldecken iind beine 

 iinterschieden. 



" Kopf pecbbraim, sehr fein imd sparsam piinktirt, FlUiler rotbbraun. Halsscbild schwarz, die seiten 

 feiu und nicbt sehr dicht, auf der scheibe nur eiiizeln punktirt. Fliigeldecken dmikelbraun, nach den 

 seiten zu heller, fein punktirt. Beine rotlibraun." 



It is doubtful whether this be a good species ; it may prove a variety of H. morio (No. 598) or one of 

 the closely allied species. — D. S. 



I-IIO. Hydroporus oppositus, Say, Tr. Am. Phil. Soc. II, p. 102. North America. 



'' Blackish ; head and base of the thorax ferruginous ; elytra with six whitish marginal spots or sub- 

 fascia. Length rather less than three-twentieths of an inch. Body with very numerous, villous, minute 

 punctures, hairs adjjressed to the surface ; head rufous or ferruginous, four or six indented, frontal, 

 distant punctures ; thorax ferruginous, black at tip, about three indented punctures placed transversely ; 

 elytra black, each with an irregular humeral spot, another placed upon the margin beliind the middle, 

 and a third apical one yellowish, edge yellowish ; post pectus and venter blackish or deep piceous ; pectus 

 and feet yellowish-testaceous." 



This was rather doubtfully identified by Leconte as H. proximiis, Aub6, (No. 513), but the description 

 appears to me inapplicable to that species. — D. S. 



1411. Hydroporus orientalis, Clk., Tr. Ent. Soc. Loud. 3 ser. I, p. 423. China (Danes Island). 



" Ovalis, penitus circularis, depressus, punctatus, carbonarius, nitidus ; capite subtiUssime punctato, 

 rufulo ; thorace antice emarginato, lateribus obliquis rotuudatis, basi subsinuato, ad medium late angulato, 

 punctato, punctis crebris et distinctis, nigi'O, ad latera subrufulo ; elytris brevibus, hand punctato-striatis, 

 punctatis ; ad latera obscure marginatis, nigris, corpore subtus inifo-fusco : antennis pedibusque rufis. 

 Long. corp. 1 lin. ; lat. | lin." 



This is a Hydrovatus, near H. tinctus (No. 200). — D. S. 



1412. Hydroporus pectoralis, Motsch., Bull. Ac. Pet. I, p. 294. Western Siberia. 



" Voisine du H. nigro-lineatus ; ressemble par ses lignes noii-es plus fortes et plus longues plutot au 

 nigro-lineatus qu'au flaviventris, mais se distingue du premier par une taille d'un tiers plus considerable^ 

 La tete et le corselet sont lisses ainsi que les elytres, les lignes uoii-es y atteignant presque la base, surtout 

 les seconde et quatrieme. La poitrine est noire dans les deux sexes, mais I'abdomen enti^rement testace 

 chez la femelle. Chez la Fern, du nigro-lineatus I'abdomen n'est testace qu' a la base, le reste est noir." 



This insect, found in the salt lakes of Western Siberia, is no doubt a species of Coelambus. — D. S. 



1413. Hydroporus persimDis, Crotch, Tr. Am. Ent. Soc. IV, p. 395. North America. 



" Very close to H. collaris, but longer, more parallel, thorax smooth, elytra more sparingly punctate 

 ■without traces of the dorsal strife, humeral angles less prominent. Length '15 inch. Canada." 



An individual of this species sent recently to me by Dr. Leconte, appears to be closely allied to H. 

 oblitus and stagnalis (Nos. 638 and 639), but is a little more elongate and dejiressed, and has the upper 

 surface rather more punctate. — D. S. 



1414. Hydroporus piceus, Stepk, 111. Brit. Eut. II, p. 62. England. 



" Oblongo<pvatus, niger, vix pubescens, elytris piceis profunde punctatis, pedibus omnino ferrugineia 

 Long. Corp. 2J lin." 



" Oblong-ovate, depressed, black, scarcely pubescent ; head anteriorly nifo-ferruginous : thorax with 



