On Aquatic Carnivorous Coleoptera or Dytiscide. 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. Reveliére) ; Tangier? 1142. 
Grotp 38. 
464. Hydroporus tessellatus, Aubé, M.C.—Elongato-ovalis, depressiusculus, dense 
subtilissime pubescens, fere opacus, niger, supra indistincte 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. 53, lat. 2s 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, Woll., M.C.—Ovalis, depressiusculus, vix pubescens, 
vel sat nitidus (6) vel fere opacus (), 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. 22 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 Aubé’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, Aubé, M.C.—Elongato-ovalis, minus convexus, 
omnium subtilissime brevissime pubescens, minus opacus, riger, capite thorace 
antennis pedibusque fuscis, capitis vertice thoracisque disco dilutioribus, antenn- 
