432 On Aquatic Carnivorous Coleoptera or Dijtiscidiv. 



In the male the thorax is broader at the base than it is in the female, the 

 front and middle tarsi are broader than in the other sex, and the claws of the 

 anterior ones are mucli more developed, the inner one being also rather longer than 

 the outer one. 



Soutlicrn Europe. (SpaLii, Guadai-rama, Rej nosa). 308. 



485. Hydroporus martini, Fairm., M.C. — Oblongo-ovalis, angustulus, omnium 

 brevissime subtilissimeque pubescens, subopacus ; subtus niger, supra minus dis- 

 crete coloratus, elytris fusco-ferrugineis, basi pallido, prothorace saspe lerrugineo 

 lateribus dilutioribus, capite, antennis pedibusque testaceis ; elytris apicem versus 

 muticis vix sinuatis ; corpore dense subtilissime punctato, prothorace basi punctis 

 majoribus conspicuis. Long. 4i, lat. 2J m.m. 



The male has the front and middle tarsi broad, and the claws of the front ones a 

 good deal more developed tlian in the female. 



I have a variety of the male in which the thorax is a good deal broader than 

 usual. 



I have no doubt this supposed species will prove to be a mere variation of H. 

 sardus, (H. sffinis, Aube), from which it differs only in colour ; the dai-k marks 

 of the upper surface cover a larger portion of the surface, and instead of being 

 black are of a ferruginous colour. 



Corsica. 247. 



4SG. Hydroporus sard us, Har., M.C. — Oblongo-ovalis, omnium subtilissime 

 brevissimecjue pubescens, subtus niger, suj^ra testaceus, prothorace parte basali 

 elytrisque signaturis magnis coufluentibus, nigricantibus ; elytris apice sinuato ; 

 prothorace elytris angustiore, lateribus plus minusve curvatis, angulis posterioribus 

 obtusis haud rotundatis ; corpore dense subtilissime punctulato, prothorace basin 

 versus punctis majoribus sat conspicuis. Long. 4^, lat. 2i m.m. 



The male has the front and middle tarsi broad, and the claws of the front ones 

 much more developed than in the female, and the sinuosity at the apex of the 

 elytra is not quite so strong, and the thorax is usually broader. 



The species is a very variable one in colour, and in some other respects ; the 

 black marks on the elytra sometimes extend to within a short distance of the base, 

 and in such individuals are less confluent than they are in others where the black 

 marks are widely absent on the basal part of tlie elytra, but form a very broad 

 irregular fascia across the middle. Large specimens of the male sex, are broader 

 and have the sides of the thorax more rounded than in other individuals. In this 

 species, as well as in the following one, the apex of the scutellum is very distinctly 

 exposed. 



Sardinia. (Cliilivani 5, 1879, and Ozieri 10. 10. 1879, Damry). 2.51. 



