808 On Aquatic Carnivorous Coleoptera or Dytiscide. 
1423. Hydroporus pulcher, Motsch., Bull. Mose. 1859, III, p. 163, pl. IV, f. 13. North America. 
“ Ovalis, postice subacutus, depressiusculus, subnitidus, ater, capitis macula frontali, ore, antennarum 
basi, thoracis macula trifida medio cum lateribus conjuncta, elytrorum basi, lineis abbreviatis maculisque 
quatuor postice testaceis; capite antice levi, postice sparsim punctato ; thorace transverso, basi bisinuato, 
punctato, angulis posticis rectis, lateribus utrinque impressis ; elytris thorace latioribus, utrinque longitu- 
dinaliter bisulcatis, punctatis, epipleuris atris ; pedibus testaceo annulatis ; mesopleuris grosso punctatis. 
Long. 14 1, lat. 3 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, Lec.—D. 8. 
1424, Hydroporus rofti, Clk., Ann, Nat. Hist., 1862, p. 176. Mexico. 
“ Latus, robustus, impubescens, punctato-striatus, niger ; elytris ad basin rufo 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 high power the surface is finely 
punctate, the apex and line of the base being more or less distinctly marked with rufous: thorax broadly 
transverse, the sides slightly rounded and much constricted 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, with three distinctly 
impressed rows of strive, and a few single deep punctures near the line of the base between the first and 
second strie ; the surface (when seen under a high power) is very finely granulated, 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 with red: abdomen and underside black: legs fuscous: antennse rufous, the apical 
joints being rufo-fuscous.” 
“Var, A. The elytra in colour entirely black ; in all examples, however, there is an indication, however 
faint, of rufous colouring at the apex. Several examples before me exhibit every shade of colouration, 
from the typical pattern to the almost black variety.” 
This species is allied to Hydroporus mexicanus (No. 527).—D. 8. 
1425. Hydroporus rufinasus, Mann., Bull. Mose., 1852, IT, p. 305. Sitkha. 
« Oblongo-ovatus, subdepressus, nigro-piceus, subnitidus ; thorace antice et postice elytrisque profunde 
punctatis, subtus niger, fronte antrorsum triangulariter, antennarum basi pedibusque anterioribus rufis. 
Long. 14 lin., lat. 3 lin.” 
This is said to be near Dytiscus tristis (No. 602). It is not alluded to by Crotch in his “ Revision of 
the North American Dytiscide.”—D. 8. 
1426. Hydroporus sabaudus, Fauy., Bull. Soc. Lin. Bord. IX, 1863, p. 276. Savoy. 
“ Ovalis, depressiusculus, nitidulus, dense subtiliter punctatus, niger, antennarum basi, geniculis late, 
tarsisque rufis, thorace fortiter transverso, lateribus obliquis, elytris vitta lateraii basi dilatata medio 
q ? ? ’ ’ 
nigro-lineolata, rufescenti, apice rotundatis. Long. 34 m.m.” 
“Taille et forme du palustris L., mais un peu plus court, plus déprime et plus large, noir; les quatre 
Pp ? 9 S& > q 
premiers articles des antennes d’un testace rougedtre, le dernier plus clair 4 la base. Téte noire, a 
ponctuation tres fine, assez serrée ; deux impressions trés-nettes en avant des yeux. Prothorax fortement 
transversal, un peu convexe dans son milieu, fortement sinue a la base qui se prolonge obtusement sur 
Vécuscon ; edtés subdéprimés, obliques, trés legérement rebordés ; angles postérieurs droits ; ponctuation 
; I p 7 s ; ) 
