378 On Aquatic Carmvorous Coleoptera or Dytiscide. 
adopted nevertheless the name used by Aube, feeling sure that the Fabrician 
description must pass into oblivion as being insufficient for recognition. 
Madagascar, Bourbon. 33. 
341. Hyphydrus distinctus, Aube, M.C.—Ovalis, minus convexus et latus, piceus, 
prothoracis lateribus dilutioribus, capite elytrisque ferrugineis ; his nigro-signatis, 
stria discoidali ad basin sat distincta ; crebre, fortiter inzequaliter punctatis ; thoracis 
lateribus sub-rotundatis, angulis posterioribus rotundato-obtusis. 
Mas, nitidus, pedibus crassis tarsorum quatuor anticorum articulo basali valde 
dilatato, trochanteribus anterioribus incisura magna, margine externo tenul ;. 
abdominis segmento apicali transversim impresso, apice medio prolongato et 
leviter incrassato. Long, 4%, lat. 33 m.m. 
Fem., 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 Aubé’s description was drawn up from specimens belonging to more than 
one species. A type of H. distinctus in Déjean’s collection is a male of this species, 
which appears to be very 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. Aubé says the female resembles the mates, 
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 inzequaliter, punctatus, punctis majoribus 
perconspicuis. 
Mas, trochanteribus anterioribus incisura sat magna, tibiis anterioribus evidenter 
dilatatis, abdomine segmento apicali transversim impresso, apice medio tuberculato- 
incrassato. Long. 4%, lat. 3 m.m. 
Fem., 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. 
conspicuous than near the base of the elytra. 
South Africa ; Caffraria (Adoo bush); Cape Town. 35. 
