On Aquatic Carnivorous Coleoptera or Dytiscide. 421 
The species is about the size of Hydroporus lareynei, (No. 454), but it is very 
readily distinguished from it by the narrower head and thorax, the latter having 
the sides simple without the broad explanate lateral portion. 
Asia Minor, (Natolia). 1141. 
453. Deronectes doriz, n. sp.—Oblongo-ovalis, sat angustus et depressus, 
nigricans, opacus, dense subtilissimeque pubescens, densissime subtilissimeque 
punctulatus, punctis majoribus obsoletis; antennis pedibusque rufis ; prothorace 
elytris multo angustiore, lateribus sinuatis, basin versus leviter angustato, angulis 
posterioribus rectis, posterius intra latus impresso. Long. 44, lat. 2 m.m. 
I do not know the sex of the only two individuals I have seen. 
Caucasus, (found by the Marquis Jacques Doria). 307. 
454. Hydroporus lareynei, Fairm., M.C.—Oblongo-ovalis, subdepressus, subtus 
nigricans, supra vel rufescens vel fusculus, antennis pedibusque rufis, opacus, dense 
subtilissime pubescens, subtilissime punctulatus, sed supra punctis majoribus sat 
numerosis et conspicuis; prothorace elytris paulo angustiore, lateribus sat ex- 
planatis, rotundatis, basin versus angustatis, angulis posterioribus obtusis. Long. 
5, lat. 2¢ m.m. 
The male has the front and middle tarsi strongly dilated, the antenne elongate, 
with the intermediate joints thickened, and the thorax gradually and gently 
narrowed from the midddle to the base, while in the female the contraction in 
front of the base is much greater and more abrupt: this difference in the form of. 
the thorax is so striking, that Reiche considered that sex to be a distinct species, 
and gave it the name of Hydroporus coarcticollis. 
Corsica. 299. 
455, Hydroporus opatrinus, Germ., M.C.—Oblongo-ovalis, nigricans, opacus, 
pruinoso-pubescens, antennis pedibusque rufescentibus, vel fere nigricantibus ; 
dense subtiliter reticulato-punctatus, supra punctis magnis, numerosis, conspicuis ; 
elytris sulca longitudinali sat distincta; coxis posterioribus punctis majoribus 
obsoletis ; thorace basin versus angustato, angulis posterioribus fere rectis. Long. 
5%, lat. 8 m.m. 
In the male the thorax is less narrowed at the base than it is in the female, so 
that the hind angles are distinctly obtuse; the prosternum bears on the middle 
between the front coxee an acute tubercle ; in the female the thorax is narrower at 
the base, and the hind angles forma sharp angle which is very nearly a right 
angle, and there is no prosternal tubercle. 
