On Aquatic Carnivorous Coleoptera or Dytiscide. 805 
* Von gestalt des H. geniculatus, aber etwas kleiner und durch die helleren fliigeldecken und beine 
unterschieden. 
“ Kopf pechbraun, sehr fein und sparsam punktirt, Fiihler rothbraun. Halsschild schwarz, die seiten 
fein und nicht sehr dicht, auf der scheibe nur einzeln punktirt. Fliigeldecken dunkelbraun, nach den 
seiten zu heller, fein punktirt. Beine rothbraun.” 
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. 
1410. 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 adpressed 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 behind 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. proximus, Aubé, (No. 513), but the description 
appears to me inapplicable to that species.—D. 8. 
1411. Hydroporus orientalis, Clk., Tr. Ent. Soc. Lond. 3 ser. I, p. 428. China (Danes Island). 
“‘ Ovalis, penitus circularis, depressus, punctatus, carbonarius, nitidus ; capite subtilissime punctato, 
rufulo ; thorace antice emarginato, lateribus obliquis rotundatis, basi subsinuato, ad medium late angulato, 
punctato, punctis crebris et distinctis, nigro, ad latera subrufulo ; elytris brevibus, haud punctato-striatis, 
punctatis ; ad latera obscure marginatis, nigris, corpore subtus rufo-fusco : antennis pedibusque rufis. 
” 
Long. corp. 1 lin. ; lat. $ lin. 
This is a Hydroyatus, near H. tinctus (No. 200).—D. 8. 
1412. Hydroporus pectoralis, Motsch., Bull. Ac. Pet. I, p. 294. Western Siberia. 
“ Voisine du H. nigro-lineatus ; ressemble par ses lignes noires 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 téte et le corselet sont lisses ainsi que les élytres, les lignes noires y atteignant presque la base, surtout 
les seconde et quatriéme. La poitrine est noire dans les deux sexes, mais abdomen entitrement testacé 
chez la femelle. Chez la Yem. du nigro-lineatus ’abdomen n’est testacé qu’ 4 la base, le reste est noir.” 
This insect, found in the salt lakes of Western Siberia, is no doubt a species of Ceelambus.—D. 8. 
1413. Hydroporus persimilis, 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 striz, 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 depressed, and has the upper 
surface rather more punctate.—D. 8. 
1414, Hydroporus piceus, Steph., Ill. Brit. Ent. IJ, p. 62. England. 
“ Oblongo-ovatus, niger, vix pubescens, elytris piceis profunde punctatis, pedibus omnino ferrugineis. 
Long. corp. 2} lin.” 
“ Oblong-ovate, depressed, black, scarcely pubescent ; head anteriorly rufo-ferruginous: thorax with 
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