On Aquatic Carnivorous Coleoptera or Dytiscide. 813 
1443. Hydroporus tinctus, Clk., Ann. Nat. Hist. 1862, X, p. 326. Britain. 
“H. oblongo-ovalis, subparallelus, sat convexus, post medium paulo latior, ad apicem modice et rotunde 
productus, crebre punctulatus leviter pubescens, subopacus, niger, obscure rufo-notatus ; capite inter 
oculos undique late et distincte depresso, sparsim punctulato, adapicemrufo tincto; thorace antice emarginato, 
lateribus leviter rotundatis, basi sinuata ad medium (scutelli regione) angulata, sparsim et fortiter 
punctato, antice juxta marginem transverse punctato-striato, ad basin plus minus transverse depresso, ad 
baseos angulos plus fortiter plerumque foveolato, nigro; elytris thorace latoribus, cum thoracis margine 
angulum obtusum formantibus, post medium latioribus, leviter punctatis, sparsim pubescentibus, nigris, 
fascia lata inequali apud humeros, vitta marginali (post medium in maculam triangularem dilatata) haud 
apicem attingente, rufis vel rufo-fuscatis, hee macule aliquando obsolete sunt, aliquando omnino absunt ; 
corpore subtus nigro; antennis fusco-nigris ; pedibus fusco-nigris, tarsorum articulis anteriorum latis.” 
“ Magnitudine variat. Long. corp. 13-14, lat. 4.” 
I believe this is a variety of Dytiscus palustris (No. 612), but it may possibly be H. incognitus (No. 611). 
—D.8. 
1444, Hydroporus truncatus, Mann., Bull. Mose., 1853, ITI, p. 162. Russian North America. 
“ Elongato-ovalis, subellipticus, depressiusculus, subtilissime et creberrime recticulato-strigulosus, tenue 
griseo-pubescens ; capite rufo-ferrugineo, in fronte infuscato; thorace antrorsum angustato ibique 
latitudine postica dimidio angustiore, lateribus haud rotundatis ferrugineis, postice aequali, supra 
‘scutellum rotundatim producto ; elytris basi et lateribus obsolete, epipleuris vero laete ferrugineis, apice 
oblique truncatis; antennis pedibus abdomineque pallide testaceis. Longit. 25 lin., latit. 1 lin.” 
This is not alluded to by Crotch either in his Check List, or “Revision of N. American Dytiscide.”—D.S. 
1445. Hydroporus undecimlinellus, Fairm., Pet. Nouv., I, p. 141. North Africa. 
“Tong. 4 m.m.—H. cerisyi certe affinis, sed minor, glaber, antice posticeque magis attenuatus, 
prothorace basi minus lato, elytrorum stria suturali minus obsoleta et lineis nigris basi magis abbreviatis. 
Tougourt.” 
This is probably a variety of Hydroporus ceresyi (No. 490).—D. 58. 
1446. Hydroporus undecimmaculatus, Clk., Journ. Ent., I, p. 412. Australia. 
“ Ovatus, latus, subdepressus, crebre punctatus niger vel fusco-niger, rufo-fusco maculatus. Long. corp. 
vix. 14 lin., lat. vix. $ lin.” 
“ Ovate, broad, of greatest breadth behind the middle, subattenuated towards the apex ; very thickly 
punctate, of a reddish, dull black colour, with rufous maculations ; head short, broad ; near the inner 
margins of the eyes ave two shallow depressions ; thorax broad, subparallel, the anterior angles largely 
rounded; the surface in front of the middle is laterally subdepressed ; the sides are broadly marginate, 
the marginations being defined by a sharp, deeply-cut fovea extending from the front to the line of the 
base ; at the basal line are three suffused circular markings of fusco-rufous, one on either side, and a third 
medial ; elytra broad, with four lateral subcircular fusco-rufous markings, three lateral at the emargina- 
tion, and a fourth opposite the one nearest the base ; legs and antenn» rufo-fuscous.” 
This is a very distinct species, the sides of the thorax are elevated so as to give it some resemblance to 
our European H. mestus (No. 456).—D. 8. 
1447. Hydroporus (Celambus) unguicularis, Crotch, Tr. Am. Ent. Soc. V, p. 73. North America. 
«“ Elongate ovate, fulvous, breast and abdomen black ; head finely punctulate with smooth spaces ; thorax 
transverse, sides slightly rounded, punctulate, disc nearly smooth, with a small black central mark and 
a linear fovea, base and apex faintly black ; elytra regularly elongate-ovate, closely and finely punctate 
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