0)1 Aquatic Carnivorous Coleoptera or Dytiscidce. 793 



" Von der grosse des H. platyiiotus, aber von anderer form, farljp, punktirimg. Dem H. opatrinus 

 iind liispanicus ain meisten iihnlich, sehr ausgezeiclinet durch flaclien Korper, sehr diclite punktirimg, 

 durch welche der ganze Kafer matt erscheint, braunrothe farbe, sehr flaches lialsschild, welclies 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 niiildeuartig ausgeflacht. ..." 



" Bei Algeciras in fliessendem wasser im Marz gesammelt ; ich besitze mir ein einziges exemplar." 



This appears to be a species of Deronectes allied to Hydroporus bicostatus, Schm. — D. S. 



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 

 2 L long, 1 1. 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 : antennae, palpi, feet, pleursu and epipleurse, 

 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 

 (" Rev. N. Am. Dytisc." p. 394) to be " recognizable by its broad form, pointed behind, head and thorax 

 often rufous, punctuation very fine." — D. S. 



1362. Hydroporus discicollis. Say, Tr. Am. Phil. IV, 1834, p. 446. North America. 



" Reddish brown, somewhat sericeous, minutely piinctured, middle of the thorax without punctures." 



" Inhabits 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, Lee, Proc. Ac. Phil. 1855, p. 299. North America. 



" Latior ovalis fere depressus (minus nitidus) subtus niger, antennis pedibus corporeque supra testaceus, 

 oapite 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 pallithoribus, 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 bead 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, Leo., (No. 

 399) but this opinion, in view of the fact that Leconte considered the indi^'idual described to be a female, 

 requires confirmation. — D. S. 



