612 On Aquatic Carnivorous Coleoptera or Dytiscide. 
The male has the front and middle tarsi a little incrassate and compressed, and 
furnished beneath with moderately small palettes, the front claws are moderately 
Jong and slender, and nearly equal, the front one being nearly straight, the hind 
one scarcely longer, but more bisinuate ; the middle claws are short, and of about 
equal lengths, the outer one being remarkably thick. 
I have seen but a single male individual of this species, it seems allied to 
Colymbetes vicinus, but to be rather longer and less convex, to have the claws on 
the hind tarsi shorter and thicker, and the claws on the front and middle feet 
different : a female in Wehncke’s collection, probably belonging to this species, has 
the posterior tarsi shorter ; in other respects it resembles the male, the thorax not 
being in the least constricted in front. 
| obtained this species in the collection of W. W. Saunders, Esq. Although 
labelled Peru, I think it may possibly be from Mexico: Wehncke’s female is labelled 
SIC nila 
South America, (Peru). 878. 
930. Colymbetes divisus, Aubé, Rhantus divisus, M.C.—Ovalis, elongatus, haud 
convexus, sat nitidns, subtus niger, supra testaceus, vertice nigro rufoque variegato, 
thorace in disco maculis duabus parvulis fuscis, elytris creberrime nigro-irroratis, 
minus subtiliter reticulatis, antennis fusco-testaceis, basi testaceo, pedibus rufis, 
posterioribus magis obscuris ; prosterno in medio minus elevato ; pedibus posteriori- 
bus gracilibus, articulo 4° gracili, unguiculo externo parvo quam interno triplo 
breviore. Long. 102, lat. 54 m.m. 
The male has the front and middle tarsi considerably incrassate and moderately 
compressed, and furnished beneath with rather large palettes, the claws of the front 
feet are moderately long and stout, and are somewhat thickened and bisinuate 
beneath, the front one being a little longer, and less sinuate than the other ; the 
middle claws are of very unequal length, the outer one being about twice as long 
as the greatly curved inner one. The species is known to me only from the type 
out of Dejean’s collection ; itis remarkable from the fact that the coxal processes are 
deeply divided, and the coxal lines less turned outwards, so that the form of the 
coxal processes is more slender in the transverse direction, than it is in the allied 
species ; this character is a slight approximation to Lancetes. 
North America, (Norfolk Sound). 879. 
931. Rhantus longipes, n. sp.—Ovalis, elongatus, haud convexus, sat nitidus, 
subtus niger, prosterno anterius cum processu testaceo, supra testaceus, vertice 
rufo nigroque variegato, thorace in disco maculis duabus parvulis fuscis, elytris: 
creberrime nigro-irroratis, antennis fusco-testaceis basi testaceo; pedibus rufis 
