422 On Aquatic Carnivorous Coleoptera or Dytiscide. 
The female seems to be the Hydroporus hispanicus of Rosenh., and is considered 
a distinct species by Leprieur. 
Southern Europe ; from Geneva to Spain. 301. 
456. Hydroporus meestus, Fairm., Ann. Soc. Fr. 1859, p. 272.—Oblongo-ovalis 
nigricans, opacus, dense minus subtiliter pruinoso-pubescens, dense subtilissime 
punctatus, et supra in thorace et elytris punctis majoribus plus minusve conspicuis, 
(sed interdum fere nullis) ; elytris sine sulea longitudinali ; prothorace lateribus 
basin versus haud vel leviter angustatis, angulis posterioribus leviter rotundatis ; 
corpore subtus densissime reticulato-punctato. Long. 5, lat. 22, m.m. 
The sexual characters are very slight, the male is generally a little smaller than 
the female, and the sides of the thorax being a little less rounded or contracted 
behind its angles are more nearly rectangular. 
This species varies greatly according to locality ; the individuals from Corsica 
and Majorca at first sight appear quite distinct from those from the Western 
Pyrenees, as they are smaller, and have the coarse punctuation much reduced, but 
all the intermediate steps may be found when the specimens from north-western Italy 
and Sardinia are examined. I believe Hydroporus fairmairei and H. inconspectus, 
Lep. (Nos. 1370 and 1380) are varieties of this species. 
Europe and Egypt, (Bondy, Paris ?; Geneva, Lombardy, South of France, Corsica, Sardinia, Majorca, 
Malaga, Algeria). 305. 
457, Hydroporus bombycinus, Lep., Ann. Soc. Fr. 1876, p. exxii—Ovalis, vix 
omnino opacus, densissime subtiliter pruinoso-pubescens, nigricans, dense subtil- 
issime punctatus, punctis majoribus vix conspicuis, vel omnino nullis; prothorace 
brevissimo, posterius haud angustato, sed angulis posterioribus late rotundatis ; 
corpore subtus subtilissime dense reticulato-punctato; pedibus vel nigricantibus 
vel flavis. Long. 44, lat. 27 m.m. 
The thorax appears in the larger specimens to be rather more narrowed towards 
the front, and these are probably the females. 
This species is very close to Hydroporus mestus, but the rounding of the hind 
angles of the thorax is greater, and the surface is more silky and less opaque, and 
the minute punctuation is rather different in character, and the coxal lines of the 
hind coxze are more approximate, and less divergent in front. 
Southern Europe, and Algeria, (Beziers ; Lombardy ; Andalusia ; Bou-Saada). 306. 
458. Hydroporas semirufus, Germ., M.C.—Oblongo-ovalis, vel rufescens, vel 
fusculus, vel niger, antennis pedibusque rufis, subtiliter pruinoso-pubescens, dense 
subtilissime punctatus, et in thorace elytrisque fortiter punctatus ; elytris sulca basali 
