4 jI' On Aquatic Curuicorous Cvltoptcra or Dytiscida. 



564. Hydroporus discretus, Fairm., M.C. — Ovalis, breviusculus, minus convexus, 

 subtiliter pubescens, subnitidus, niger, antennis pedibusquc rufis, illis extrorsum 

 fuscescentlbus ; thorace elytrisque crebre, ajqualiter, sat subtiliter punctatis ; coxis 

 posterioribus crebre fortiter punctatis. Long. 3, lat. If m.m. 



The sexua! differences are extremely slight. I find it so difficult to distinguish 

 between certain specimens of this and the H. corsicus and H. neuter, that I think 

 they may prove all one species. 



Europe, from Scotland to Alsasua, (Cantabrian mountains). 38G. 



5G5. Hydroporus corsicus, Wehncke, Berl. Ent. Zeit. XV, p. 1G3. — Ovalis, sat 

 convexus, subtiliter pubescens, nitidus, niger, antennis pedibusque rufis, illis vix 

 fuscescentlbus; thorace elytrisque crebre sequaliter distincte jounctatis ; coxis 

 posterioribus crebre, fortiter punctatis. Long. 3,1, lat. \l m.m. 



This species is very close to Hydroporus neuter, but is rather narrower and 

 more oblong, and generally has the punctuation of the elytra rather coarser and 

 less close. I see no sexual distinctions. 



Corsica. 385, 



5G6. Hydroporus neuter, Fairni. Faun. Fr. p. 205. — Ovalis, .sat convexus, 

 crebrius subtiliter pubescens, nitidus, niger, antennis pedibusque rufis, illis vix 

 f uscescentibus ; thorace elytrisque tequaliter, subtiliter fere dense punctatis ; coxis 

 posterioribus crebre fortiter punctatis ; abdomine nitido, medio parce subtilissime 

 punctato. Long. 3f, lat. 1? m.m. 



There seems to be scarcely any difference between the sexes. The species seems 

 to be variable, and is very closely allied to H. discretus (No. 564), but it is usually 

 larger and more finely punctured, but some specimens of the two forms approach 

 very closely to one another. 



A specimen sent me by M. Fairmaire, labelled " neuter, Paris," seems to be a 

 variety of this species with the ventral segments in the middle rather more closely 

 punctured. 



Europe ; (Pyrenees, Savoy). 384. 



5G7. Hydroporus fuscipennis, Kies., M.C. -Ovalis, sat convexus, subnitidus, 

 crebrius evidenter pubescens, crebre, tequaliter, minus subtiliter punctato, niger, 

 pedibus obscure rufis, antennis gracilibus, fuscis basi rufo, capite elytrisque fuscis ; 

 coxis posterioribus fortiter, sat crebre punctati.s, abdomine evidenter punctulato, 

 segmento ultimo distincte punctato ; tarsis anterioribus articulo tertio (prsesertim 

 in femina) sat elongato. Long. 3i, lat. Ig m.m. 



