On Aquatic Carnivorouft CoLeoptcra or Dijtiscidce. 433 



487. Hydroporus canaliculatus, Lac, M.C. — Ovalis, latiusculus, brevissime 

 subtilissimeque pubescens, fere opacus, subtus niger, supra testaceus, elytris lineis 

 angustis minus distinctis fuscis, longitudinaliter subsulcatis ; prothorace basin versus 

 transversim subdepresso, basi elytris angustiore, lateribus subrectis, angulis 

 posterioribijs rectis baud rotundatis ; corpora dense subtilissime punctulato. Long. 

 4f, lat. 2| m.m. 



In the male the front and middle tarsi are only a little broader than in the 

 female. 



Southern and Central Europe, (Si)ain, Portugal, and France as far north as the Seine, Hildeslieim). 

 2G3. 



488. Hydroporus steppensis, Motsch., M.C. — Ovalis, angustulus, elytris dense 

 breviterque pubescentibus, fere opacus ; subtus niger, supra testaceus, elytris sutura 

 lineisque vix coalescentibus nigris ; prothorace postice latiore, lateribus obliquis 

 angulis posterioribus minus acutis ; corpore dense subtilissime punctulato. Long. 

 4i, lat. 2i m.m. 



In the male the front tarsi are rather strongly dilated. 



I have seen only three individuals (males in bad condition) of this species ; it is 

 closely alhed to H. ceresyi, but is smaller, and has the hind angles of the thorax 

 less acute. 



Kirstisia. 264. 



489. Hydroporus basticus, Scliaum, M.C. — Ovalis, angustulus, elytris tenuiter 

 pubescentibus, fere opacus ; subtus niger, supra albido-testaceus, prothorace basi 

 minus distincte nigro-notato ; elytris lineis baud vel vix confluentibus nigris ; 

 prothorace lateribus subrectis, pone medium baud latiore, angulis posterioribus 

 rectis, nuUo modo rotundatis ; corpore dense subtilissime punctulato. Long. 4 J, lat. 

 2 m.m. 



The male has the front and middle tarsi broader than in the female ; in the latter 

 sex the punctuation of the upper surface is almost absent. 



This species is rather smaller than H. ceresyi ; the thorax is straighter at the 

 sides with the hind angles less acute, it has a more distinct transverse impression 

 in the middle in front of the base, and the dark spots near this impression are 

 larger. I am very doubtful whether it be really a distinct species, for I am scarcely 

 able to distinguish certain individuals of a series of a small variety of H. ceresyi, 

 found by Van Volxem at Portimaio. 



South of Spain, and Algeria. 2G2. 



