422 On Aquatic Carnivoroxis Coleoptera or DytiscidcB. 



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 moestus, Fairm., Ann. Soc. Fr. 1S59, p. 272. — Oblongo-ovalis 

 nigricans, opacus, dense niiiuis subtiliter pruinoso-pubescens, dense subtilissime 

 punctatus, et supra in thorace et elytris punctis majovibus plus minusve conspicuis, 

 (sed interdum fei'e nullis) ; elytris sine sulca longitudinali ; prothorace lateribus 

 basin versus baud vel leviter angustatis, angulis posterioribus leviter rotundatis ; 

 corpore subtus densissime reticulato-punctato. Long. 5, lat. 2 J, m.m. 



The sexual characters are very slight, the male is generally a little smaller than 

 the fsmale, 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 Fiance, Corsica, Sardinia, Majorca, 

 Malaga, Algeria). 303. 



457. Hydroporus bombycinus, Lej)., Ann. Soc. Fr. 1876, p. cxxii. — Ovalis, vix 

 omnino opacus, densissime subtiliter pruinoso-pubescens, nigricans, dense subtil- 

 issime punctatus, punctis majoribus vix conspicuis, vel omnino nullis ; prothorace 

 brevissimo, posterius baud angustato, sed angulis posterioribus late rotundatis ; 

 corpore subtus subtilissime dense reticulato-punctato; jjedibus vel nigricantibus 

 vel flavis. Long. 4i, lat. 2? m.m. 



The thorax appears in the larger specimens to be rather more narrowed towards 

 the front, and these are probablj' the females. 



This species is very close to Hydroporus moestus, 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 coxae are move approximate, and less divergent in front. 



Southern Europe, and Algeria, (Bcziers ; Lombardy ; Andalusia; Bou-Saada). 30G. 



458. Hydroporus 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 



