On Aquatic Carnivorous Coleoptera or DytiscidcB. 623 



pedibusque anterioribus rufis, pedibus posterioribus piceis ; corpore fere Isevigato in 

 elytris obsoletissime reticulate; prothoracis mai'gine laterali distincto ; tarsorum 

 posticorum articulis extus fere truncatis. Long. 16, lat. 7i m.m. 



The male has the front and middle tarsi with the three basal joints distinctly 

 incrassate but much compressed, and furnished beneath with four series of quite 

 small palettes, the marginal hairs only moderately developed, the claws are only 

 moderately long, simple and equal. There is no sexual distinction in sculpture. 



South Africa, (Cape of Good Hope). 903. 



957. Colymbetes capensis, Aube, Rhantus capensis, 31.0. — Ovalis, convexus, 

 nitidus, subtus piceus, prosterno, pectore medio abdominisque fasciis transversis 

 rufescentibus, supra capite thoraceque rufo-testaceis, illo vertice nigro-variegato, 

 hujus disco plaga nigra in medio divisa, elytris testaceis, maculis parvis nigris 

 creberrime irroratis, antennis pedibusque testaceis, pedibus posterioribus rufis ; 

 corpore fere Isevigato, elytris feminse exterius in parte basali conspicue reticulatis ; 

 pi'othorace margine laterali lato et obsolete ; tarsis posterioribus articulis extus 

 breviter lobatis. Long 15, lat. 7i m.m. 



The male has the basal joints of the front and middle tarsi much incrassate and 

 compressed, and furnished beneath with moderately large palettes placed on long 

 hairs, the marginal hairs very elongate and with curled extremities ; the front claws 

 are elongate, the anterior one with its basal portion incrassate, the posterior 

 distinctly shorter and nearly simple ; the claws of the middle feet are very unequal 

 the outer beinsr much longer and thicker than the more curved inner one. The 

 upper surface of this species might be described as smooth, were it not for the 

 reticulate sculpture of the outer portion of the elytra in the female ; these reticula- 

 tions are indistinctly divided into two patches by a smooth space. 



South Africa, (Caffraria). 904. 



958. Rhantus goudoti, (Dej.) n. sp. — Ovalis, convexus, nitidus, sublsevigatus, 

 subtus nigricans, supra rufus, vertice nigro-variegato, prothorace lateribus palli- 

 dioribus, vitta discoidali nigricante, elytris versus suturam nigro-vermiculatis, versus 

 latera nigro-irroratis, antennis rufis, pedibus piceo-rufis, posterioribus piceis ; pro- 

 thorace sine margine laterali; tarsis posterioribus extus vix lobatis. Long. 13f, 

 lat. 7i m.m. 



In the male the front tarsi are distinctly incrassate and much compressed, and 

 a,re furnished beneath with four rows of narrow palettes placed on long stalks, the 

 marginal hairs inconspicuous, the front claws are very slender and elongate, the 

 posterior one is a little shorter than the anterior and has its basal portion more 

 arched, and its outline more sinuate ; the middle tarsi are clothed beneath in a 



