On Aquatic Carnivorous Coleoptera or Dytiscide. 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 
posterioribus rectis haud rotundatis ; corpore dense subtilissime punctulato. Long. 
Az, lat. 23 m.m. 
In the male the front and middle tarsi are only a little broader than in the 
female. 
Southern and Central Europe, (Spain, Portugal, and France as far north as the Seine, Hildesheim). 
263. 
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. 
4, lat. 23 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 1s 
closely allied to H. ceresyi, but is smaller, and has the hind angles of the thorax 
less acute. 
Kirgisia. 264. 
489. Hydroporus beeticus, Schaum, M.C.—Ovalis, angustulus, elytris tenuiter 
pubescentibus, fere opacus; subtus niger, supra albido-testaceus, prothorace basi 
minus distincte nigro-notato; elytris lineis haud vel vix confluentibus nigris ; 
prothorace lateribus subrectis, pone medium haud latiore, angulis posterioribus 
rectis, nullo modo rotundatis ; corpore dense subtilissime punctulato. Long. 44, 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. 262. 
