808 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



1423. Hydroporus pulcher, Motscli., Bull. Mosc. 1859, III, p. 163, pi. IV, f. 13. Nortli America. 



" Ovalis, postice subacutus, depressiusculus, subnitidus, ater, capitis macula frontali, ore, antermarum 

 biisi, thoracis macula trifida medio cum lateribus conjuncta, elytrorum basi, liueis abbreviatis macidisque 

 quatuor postice testaceis j capite antice laevi, postice spai'sim pimctato ; tliorace transverso, basi bisinuato, 

 punctato, anguUs posticis rectis, lateribus utrinque impressis ; elytris thorace latioribus, utrinque longitu- 

 diualiter bisiilcatis, punctatis, epipleuris atris ; pedibus testaceo annulatis ; mesopleuris grosso punctatis. 

 Long. U 1., lat. I 1." • 



Ross Colony, New Helvetia. 



This very variegate species is perhaps allied to H. eximius, Motsch. (No. 522). The name cannot be 

 used on account of the prior H. pulcher, Lee. — D. S. 



1424. Hydroporus roffi, Clk., Ann. Nat. Hist., 1862, p. 176. Mexico. 



" Latus, robustus, impubescens, punctato-striatus, niger ; elytris ad basin i-ufo notatis, ad apicem juxta 

 marginem rufo-maculatis, pedibus fuscis. Long. corp. 2 lin., lat. 1 lin." 



" . . . . Head broadly transverse; ■when seen from the front, two distinct depressions are 

 apparent on either side near the inner surface of the eyes ; under a liigh power the surface is finely 

 punctate, the apex and line of the base being more or less distinctly marked ^^■ith iiifous : thorax broadly 

 transvei-se, the sides slightly rounded and much consti-icted towards the front ; the surface is subglobose ; 

 parallel to the anterior and also the posterior margin is a depressed line of punctures, those at the base 

 being more distinctly apparent : elytra broad, attenuate towards the apex, subglobose, ^-ith three distinctly 

 impressed rows of stria\ aud a few single deep punctures near the line of the base between the first and 

 second striaj ; the surface (when seen under a high power) is very finely gi'anulated, in colour black, the 

 line of the base being marked with rufous (in some examples this basal marking is almost obsolete) ; 

 towards the apex, near the margins, are two or three well-defined red spots ; the apex itself also is 

 distinctly marked mth red : abdomen and underside black : legs fuscous : antennie rufous, the apical 

 joints being rufo-fuscous." 



" Var. A. The elytra in colour entii-ely black ; in all examples, however, there is an indication, however 

 faint, of rufous coloui-ing at the apex. Several examples before me exhibit every shade of colouration, 

 from the typical pattern to the almost black variety." 



This species is aUied to Hydroponis mexicanus (No. 527). — D. S. 



1425. Hydroponis nifinasus, Mann., Bull. Mosc, 1852, II, p. 305. Sitkha. 



" Oblongo-ovatus, subdepressus, nigro-piceus, siibnitidus ; thorace antice et postice elytrisque profunde 

 punctatis, subtus niger, fronte antrorsum triangulariter, antennaiiim basi pedibusque anterioribus rufis. 

 Long. IJ Hn., lat. f lin." 



This is said to be near Dytiscus tristis (No. 602). It Ls not alluded to by Crotch in his " Revision of 

 the North American Dytiscidie." — D. S. 



1426. Hydroporus sabaudus, Fauv., Bull. Soc. Lin. Bord. IX, 1863, p. 276. Savoy. 



" Ovalis, depressiusculus, nitidulus, dense subtUiter pimctatus, niger, antennarum basi, genicvdis late, 

 tai-sisque mfis, thorace fortiter transverso, lateribus obliquis, elytris vitta laterali basi dilatata, medio 

 nigio-lineolata, infescenti, apice rotundatis. Long. 34 m.m." 



"Taille et fonne du palustris L., mais un peu plus court, plus deprime et plus large, noir ; les quatre 

 premiers articles des anteuues d'uii testace rougeatre, le dernier plus clair a la base. Tete noire, h 

 ponctuation tres fine, assez serree ; deux impressions tres-nettes en avaut des yeux. Prothorax fortement 

 transvei-sal, un peu convexe dans son milieu, fortement sinue h. la base qui se prolonge obtusement sur 

 I'ecusson ; cutes subdeprimes, obliques, tres legerement rebordes ; angles posterieurs di-oits ; ponctuation 



