On Aquatic Carnivorous Coleoptera or Dytiscade. 793 
“ Von der grésse des H. platynotus, aber von anderer form, farhe, punktirung. Dem H. opatrinus 
und hispanicus am meisten uhnlich, sehr ausgezeichnet durch flachen Korper, sehr dichte punktirung, 
durch welche der ganze Kifer matt erscheint, braunrothe farbe, sehr flaches halsschild, welches seitlich 
nur sehr wenig gerundet und fast gerade ist. Auf den fliigeldecken sind die aiisseren rippen nur kurz, 
die innerste sehr stark, die naht ebenfalls kielartig erhaben, der Raum zwischen dieser und der ersten 
Rippe muldenartig ausgeflacht. 3” 
“ Bei Algeciras in fliessendem wasser im Mirz gesammelt ; ich besitze nur ein einziges exemplar.” 
This appears to be a species of Deronectes allied to Hydroporus bicostatus, Schm.—D., &. 
1361. Hydroporus dichrous, Melsh., Proc. Ac. Philad. II, p. 28. North America. 
“Dusky, finely punctured, slightly pubescent ; head and thorax rufous ; body beneath black.—Hardly 
21. long, 11 wide. Pennsylvania.” 
“ Body ovate, finely and densely punctured, and slightly pubescent : head dull rufous, with an oblique 
shallow indentation each side between the eyes, which are black: thorax colour of the head, with the 
middle of the anterior margin dusky ; much and finely punctured, particularly the posterior margin and 
sides ; the latter slightly rounded : elytra dark reddish-brown, paler towards the sides ; finely and densely 
punctured, and slightly pubescent ; apex acutely rounded : antenne, palpi, feet, pleurze and epipleure, 
rufous: venter and pectus black, distinctly punctured, the former with three or four lateral rufous spots.” 
“ Var.—Larger ; head tinged with black ; thorax nearly the colour of the elytra.” 
This is placed by Crotch between H. modestus (No. 627), and H. Americanus (No. 619), and said 
(Rey. N. Am. Dytise.” p. 394) to be “recognizable by its broad form, pointed behind, head and thorax 
often rufous, punctuation very fine.”—D. 8. 
1362. Hydroporus discicollis, Say, Tr. Am. Phil. IV, 1834, p. 446. North America. 
“Reddish brown, somewhat sericeous, minutely punctured, middle of the thorax without punctures.” 
« Inbabits North West Territory.” 
“ Body entirely dark-reddish brown, with minute punctures ; head ——-—— ; thorax with the disc 
impunctured, polished, and a little more convex ; elytra darker than the thorax, more obviously sericeous ; 
lateral margin a little paler ; spot at the tip dull yellowish ; post pectus black piceous. Length three- 
twentieths of an inch.” 
Found during Long’s expedition to the source of St. Peter’s River. The species intended has not been 
recognized by Leconte or Crotch.—D. S. 
1363. Hydroporus discoideus, Lec., Proc. Ac. Phil. 1855, p. 299. North America. 
«“ Tatior ovalis fere depressus (minus nitidus) subtus niger, antennis pedibus corporeque supra testaceus, 
capite lateribus et occipite infuscato ; thorace elytris angustiore macula magna basali infuscato, lateribus 
late rotundatis tenuiter marginatis cum elytris angulum formantibus, elytris confertissime punctulatis 
‘disco maximo communi infuscatis, sutura lineolisque anticis paucis pallidioribus, margine late testaceo 
relicto. Long. ‘15.” 
“ One female found at Fort Laramie. Broader and flatter than the allied species, and (in case the male 
should be more shining and more coarsely punctured) distinguished by the large basal spot of the thorax. 
The head and thorax are moderately punctured ; the dark portion of the elytra is very well defined, and 
does not fade at all into the broad pale margin.” 
According to Crotch (Tr. Am. Ent. Soc. IV, p. 389), this is a male of Hydroporus patruelis, Lec., (No. 
399) but this opinion, in view of the faet that Leconte considered the individual described to be a female, 
requires confirmation.—D. 8. 
