On Aquatic Carnivorous Coleoptera or Dytiscide. 807 
narrow sides ; elytra broad, depressed, finely punctate, more distinctly so than in H. bryanstonii ; in colour, 
flavous, faintly clouded with fusco-flavous, the sutural line being distinctly black : abdomen and underside 
black ; legs and antennee pale flavous.” 
“ Allied to H. pustulatus, Melsh.; it is a trifle broader, not so convex, and more glabrous.” 
This is perhaps to be referred to Hydrovatus.— D. 8. 
1419. Hydroporus productus, Fairm., Ann. Soc. Fr., 1880, p. 248. Algeria. 
“Tong. 34m.m. Elongatus, subparallelus, antice posticeque fere equaliter angustatus, dorso planatus 
fusco-niger, nitidus, ore antennis pedibusque obscure testaceis ; capite lato, parum convexo ; prothorace 
brevi, antice angustato, lateribus leviter antice arcuatis, margine postico medio obtuse angulato, ante 
basin linea arcuatim transversa obsolete impresso, ad angulos posticos evidentius impresso; elytris 
elongatis ad apicem tantum angustatis, apice ipso obtuso, subtilissime vix perspicue sat dense punctulatis, 
utrinque lineis 2 fortius punctatis impressis.” 
Batna. 
“Remarquable par sa forme allongée, presque paralléle, et sa ponctuation excessivement fine, a peine 
distincte, mais assez serrée. Sa forme rappelle assez celle des H. notatus et neglectus, mais elle est plus 
allongée, plus paralléle, plus acuminée en arriére et la partie dorsale est plus déprimée ; la ponctuation 
est aussi toute différente et n’est visible qu’ avec un fort grossissement, aussi le dessus est-il plus brillant. 
La coloration, @’un brun noir foncé, est un peu rougeatre sur la téte, qui est trés finement et densement 
onctueé, avec les deux impressions bien marquées.” 
p > 
1420. Hydroporus pseudo-geminus, Regt., Ann. Soc. Fr., 1877, p. Ixxix. Manilla. 
“H, gemino, Fab., ex Europa valde affinis, sed magis elongato-oblongus ; prothorace ad latera 
rotundato, vix postice quam antice latiore, cum elytris angulum sat fortem preebente ; elytris oblongis, 
haud parallelis, ut in gemino pictis, sed magis aurato-pubescentibus ; prothoracis et elytri strigis omnino 
ad basin contiguis et angulum inter se latissimum prebentibus ; subtus omnino niger, pedibus testaceis ; 
antennis testaceis crassiusculis. Long. 2 m. m.” 
[At p. 360, op. cit., this diagnosis is supplemented by a description. | 
The species is no doubt a Bidessus, like Dytiscus geminus, to which it appears very similar.—D. 8. 
1421. Hydroporus puberulus, Lec., Agass. Lake Sup., p. 215. North America. 
«“ Blongato-ovalis, minus convexus, niger minus dense punctatus pubescens, thorace lateribus rotundatis 
cum elytris angulum formantibus, disco minus punctato, elytris parallelis, apice oblique attenuatis ; 
antennis palpis pedibusque rufis. Long. -12.” 
“ Resembles the two next (H. caliginosus and H. tartaricus), but is narrower, a little more convex, the 
posterior angles of the thorax are somewhat obtuse, and the sides form an angle with the elytra.” 
Crotch, “‘Rev. N. Amer. Dytise.” p. 395, considers this is the same as H. caliginosus (No. 1,348).—D. 8. 
1422. Hydroporus pudicus, Olk., Tr. Ent. Soc., 1863, p. 426. Java. 
“ Ovalis sat latus et convexus, punctulatus, haud striato-punctatus, rufus; capite pallide rufo, oculis 
magnis, impunctato ; thorace antice emarginato, lateribus tenue marginatis, basi ad medium late angulato, 
impunctato, rufo, ad basin fusco-rufo ; elytris convexis, robustis, punctulatis, rufis vel fusco-rufis ; pedibus 
antennis, corporeque subtus rufis. Long. corp. lin. 1; lat. lin. 4.” 
The type in the Brit. Mus. shows this to be a Hydrovatus, closely allied to H. fulvescens (No. 192), 
but narrower-—D. 8. 
