378 On AqUiUic Carnivorous Coleoptcra or Dytiscido'. 



adopted nevertheless the name used by Aube, feeling sui'e that the Fabrician 

 description must pass into oblivion as being insufficient for recognition. 



Madagascar, Bourbon. 33. 



341. Hyphydrus distiuctus, Aube, M.C. — Ovalis, minus convexus et latus, piceus^ 

 prothoracis lateribus dilutioribus, capite elytrisque ferrugineis ; his nigro-signatis, 

 stria discoidali ad basin satdistincta ; crebre, fortiter insequaliter punctatis ; thoracis- 

 lateribus sub-rotundatis, angulis posterioribus rotundato-obtusis. 



Mas, nitidus, pedibus crassis tarsorum quatuor anticorum ai'ticulo basali vald& 

 dilatato, trochauteribus anterioribus incisura magna, margine externo tenui ; 

 abdominis segmento apicali transversim impresso, apice medio prolongate et 

 leviter incrassato. Long. 4J, lat. Sj m.m. 



Fern., opaca, obsoletius punctata, pedibus abdomineque simplicibus. 



This species is less convex in form than its allies, and is very readily distinguished 

 by the great dilatation of the basal joint of the four front tarsi, especially of the 

 intermediate pair : the punctuation on the thorax is very close, and on the elytra 

 the large punctures are much developed, the smaller ones being moderate. 



I think Aube's description was drawn up from specimens belonging to more than 

 one species. A type of H. distinctus in Dejean's collection is a male of this species, 

 which appears to be veiy rare in collections. I have only seen a single female, 

 which differs from the male in colour and sculpture in a similar manner as does the 

 female of H. variegatus from its male. Aube says the female resembles the males,, 

 and it is possible there may be a shining form of the sex. 



Madagascar, Bourbon. 34. 



342. Hyphydrus grossus, n. sp. — Ovalis, convexus, nitidus, ferrugineus, prothorace 

 infuscato lateribus dilutioribus, elytris testaceis nigro-signatis, stria discoidali ad 

 basin distincta ; confertim, fortiter, valde insequaliter, punctatus, punctis majoribus 

 perconspicuis. 



Mns, trochanteribus anterioribus incisura sat magna, tibiis anterioribus evidenter 

 dilatatis, abdomine segmento apicali transversim impresso, apice medio tuberculato- 

 incrassato. Long. 4 J, lat. 3 m.m. 



Fein., Paulo minor, vix adeo fortiter punctata. 



This is a rather broad and convex species, and is remarkable for the very coarse 

 and numerous conspicuous large punctures on the upper surface, the finer punctures 

 between the large ones are distinct but not coarse, towards the apex of the elytra 

 the large punctures are more indistinct, and the finer ones coarser and more 

 numerous, so that there the unequal character of the sculpture is much less- 

 consoicuous than near the base of the elytra. 



South Africa ; Caffraria {Adoo bush) ; Cape Town. 35. 



