On Aquatic Carnivorous Colcoptcra or JhjtiscidcB. 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). 1 141. 



453. Deronectes dorite, n. s^). — 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. 41, 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 

 nuraerosis et conspicuis ; prothorace elytris paulo angustiore, lateribus sat ex- 

 planatis, rotundatis, basin versus angustatis, angulis posterioribus obtusis. Long. 

 5, lat. 2f m.m. 



The male has the front and middle tarsi strongly dilated, the antennas 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 coarcticoUis. 



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. 3 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 presternum bears on the middle 

 between the front coxse an acute tubercle ; in the female the thorax is narrower at 

 the base, and the hind angles form a sharp angle which is very nearly a right 

 angle, and there is no prosternal tubercle. 



:! I -i 



