On Aquatic Carnivorous Coleoptera or Dijtiscidce. 425 



The above description is made from Corsican individuals. The only specimen I 

 have seen from North Africa differs so much from them, that it may be another 

 species. 



Corsica, (E. Eeveliere) ; Tangier? 1142. 



Group 3. 



464. Hydroporus tessellatus, Aube, M.C — Elongato-ovalis, depressiusculus, dense 

 subtilissime pubescens, fere opacus, niger, supra indistiucte testaceo-variegatus, 

 antennis pedibusque rufescentibus ; thorace lateribus sat rotundatis, angulis 

 posterioribus distinctis, obtusis ; corpore dense subtilissime punctulato, thorace 

 basin versus punctis majoribus sat conspicuis. Long. 5i, lat. 2l m.m. 



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

 more developed than in the female and the anterior one is dilated at the base so as 

 to show there an angular projection ; in this sex the apex of the elytra is slightly 

 sinuate, while in the female there is a very indistinct tooth near the extremity 

 of each. 



Canary Islands. 249. 



Group 4. 



465. Hydroporus vigilans, WoU., M.C. — Ovalis, depressiusculus, vix pubescens, 

 yel sat nitidus (<?) vel fere opacus (p), capite thoraceque testaceis, plus minusve 

 infuscatis, elytris testaceis sed lineis confluentibus fuscis fere omnino obscuratis ; 

 elytris apice vix sinuato ; thorace lateribus fortiter rotundatis ; subtus niger ; 

 corpore dense subtilissime punctato. Long. 5, lat. 2i m.m. 



In the male the front and middle tarsi are moderately dilated, the claws of the 

 front ones are more developed than in the female ; the upper surface of the female 

 is duller than in the male, from the sculpture being more obsolete ; in the male 

 there are conspicuous scattered larger punctures on the basal portion of the 

 thorax, but in the female they are very obsolete. 



I suspect from Aube's description of Hydroporus dubius (Spec. p. 517) that this 

 species is the same as the H. vigilans, Woll., and that the locality given by Aube 

 (Africa) is erroneous. 



Madeira. 248. 



466. Hydroporus luctuosus, Aube, M.C. — Elongato-ovalis, minus convexus, 

 omnium subtilissime brevissime pubescens, minus opacus, niger, capite thorace 

 antennis pedibusque fuscis, capitis vertice thoracisque disco dilutioribus, antenn- 



