810 On Aquatic Carnivorous Coleoptera or Dytiscide. 
which it is contracted. Palpi, antenn, four anterior tibie 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 23 
lines.” 
It is possible this may prove to be a species of Deronectes.—D. S. 
1431. Hydroporus seminulum, Lec., 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 punctulate, 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. granum, but very different by the body 
being strongly narrowed behind the middle, and pointed at the posterior end. Differs 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, rare species.—D. 8. 
1432. Hydroporus sericatus, Say, Tr. Am. Phil. TV, 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 dilated, not profound, indentation each side, and numerous small 
punctures ; antennz 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 ; strie 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.” 
“Tt is closely allied to undulatus, Say, but is more sericeous, the elytral lines are not so dilated or 
conftuent, &c.” 
1433. Hydroporus stearinus, Kol., Melet. Ent. I, p. 84, pl. 2, f. 14. Caucasus. 
<‘ Hlongato-ovalis, convexiusculus, attenuatus, rufo testaceus ; infra niger, abdominis annulis posticis et 
apice obscure ferrugineis ; capite, antennis pedibusque rufis ; thorace ad latera vix rotundato, depressius- 
culo, rufo, postice anguste paululum 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, 23 lin.” 
This is probably an insect unknown to me; the figure given, /. ¢., is very inferior.——D. 8. 
1434. Hydroporus subalpinus, Th., Op. Ent., [V, p. 365. Sweden. 
“‘Oblongus, niger subconvexus, tenuiter pubescens; prothorace limbo punctato, lateribus tenuiter 
marginatis, fere in arcu continuo cum elytris rotundatis ; his subtilius, sat crebre punctatis. Long, 
14 lin.” 
“ Mas : unguiculis anticis inequalibus, muticis.” 
“ Statura, magnitudine et fere punctura H. glabelli, sed corpore paulo angustiore, prothoracis margine 
tenuiore, processu basali minus lato sed magis producto: ab H. acutangulo punctura elytrorum subtiliore 
prothorace lateribus fere in arcu continuo cum elytris rotundatis discedens ; ab H. geniculato iisdem 
notis, corpore minore, elytris postice haud dilatatis facillime distinguendus. Caput mediocre, nigrum, 
