810 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



wliich it is contracted. Palpi, antenuse, four anterior tibiae and tarsi tawney. Elytra smooth, each with 

 the basal third part testaceous, which hue is much excavated ; two posterior elongated testaceous dots, 

 and a large elliptical, subapical, nearly complete testaceous ringlet. Length of the body 2^ 

 lines." 



It is possible this may prove to be a species of Deronectes. — D. S. 



1431. Hydroporus seminulum, Lee, Proc. Am. Phil. Soc. 1878, p. 377. North America. 



" Broadly ovate, obliquely attenuate behind, rounded in front, not very convex ; rufo-testaceous, 

 shining. Prothorax scarcely perceptibly punctidate, with a fine short basal stria each side, which does 

 not extend upon the elytra ; the latter very finely though distinctly punctulate, Beneath sparsely but 

 strongly punctulate. Length 1-3 m.m." 



" Enterprise, Florida, one specimen. Of the same size as H. gramim, but very different by the body 

 bein" strongly narrowed behind the middle, and pointed at the posterior end. Difiers also from all pre- 

 viously known small species of the United States, by the thorax having a very short basal stria not 

 continued on the elytra." 



From the above description I believe this is a Bidessus belonging to the second group, consisting of a 

 few peculiar, rai'e species. — D. S. 



1432. Hydroponis sericatus. Say, Tr. Am. Phil. IV, 445. Mexico. (In a small river beyond Vera- 

 Cruz). 



" Yellowish ; elytra blackish with abbreviated lines and margin dull yellowish. Dull honey-yellow, some- 

 what sericeous above ; head with a dUated, not profound, indentation each side, and numerous small 

 punctures ; antenna; also honey-yellow ; thorax a little dusky on the anterior and posterior margins, 

 with numerous, small, slightly impressed punctures ; elytra dark brownish, almost black, more obviously 

 sericeous than the thorax ; striae none ; lateral margin dull-honey, dilated near the base into a band of 

 about four abbreviated, unequal, longitudinal lines, excepting the inner one, not reaching the base, 

 another somewhat similar band behind the middle and slight double dilatation at tip of the same colour. 

 Length less than one-fifth of an inch." 



" It is closely allied to undulatus, Say, but is more sericeous, the elytral lines are not so dilated or 

 confluent, &c." 



1433. Hydroporus steaiinus, Kol., Melet. Ent. I, p. 84, pi. 2, f. 14. Caucasus. 



" Elongato-ovalis, convexiusculus, attenuatxis, rufo testaceus ; infra niger, abdominis annulis posticis et 

 apice ol)Scure ferrugineis ; capite, autennis pedibusque rufis ; thorace ad latera vix rotundato, dejiressius- 

 cido, i-ufo, postice anguste pa\dulum piceo et in Integra disci circumferentia pone margines obscure im- 

 presso, in medio disci punctis tribus impressis ; elytris tribus costulis subtilissimis concoloribus, pone 

 suturam stria unica obsolete punctata, apice subrotundis. Long, 2^ lin." 



This is probably an insect unknown to me ; the figure givu, I. c, is very inferior. — D. S. 



1434. Hydropoi-us subalpinus, Th., Op. Ent., IV, p. 365. Sweden. 



" Oblongus, niger subconvexus, tenuiter pubescens; prothorace limbo punctato, lateribus tenuiter 

 marginatis, fere in arcu continue cum elytris rotundati.s ; his subtilius, sat crebre punctatis. Long. 

 IJ lin." 



" Mas : ungiiiculis anticis iuKqualibus, muticis." 



" StatuvM, iiiagnitudine et fere pimctura H. glabelli, sed corpore paulo angustiore, prothoracis margine 

 tenuiore, pi-oceasu basali minus lato sed magis producto : ab H. acutangulo pimctura elj-trorum subtiliore 

 prothorace lateribus fere in arcu continuo cum elytris rotundatis discedens ; ab H. geuiculato iisdem 

 iiotis, corpore minore, elytris postice hand dilatatis facQlime distinguendus. Caput mediocre, nigrum, 



