On Aquatic Carnivorous Coleoptera or Dytiscida. 609 
presso; metasterni lateribus brevibus; tarsis posterioribus elongatis, unguiculis 
valde inzequalibus. Long. 10, lat. 5 m.m. 
The male has the front tarsi rather broadly dilated, and not compressed, the 
fourth joint being triangular; they are cluthed beneath with four series of narrow 
palettes, and on the basal portion with short sete ; their claws are rather short and 
stout, and strongly curved, the front one being rather shorter than the hind one; 
the middle tarsi are also dilated and clothed like the front feet, their fifth joint is 
elongate, but the claws are wanting in the only specimen known. The female is 
unknown. 
New Zealand, (Dunedin, Castlenau). 870. 
924. Colymbetes pulverosus, Steph., Rhantus pulverosus, M.C.—Ovalis, haud 
convexus, nitidus, subtus niger, prosterni processu plus minusve dilutiore, antennis 
pedibusque anterioribus testaceis, pedibus posterioribus piceis, supra testaceus, 
vertice nigro rufoque variegato, thorace in medio macula transversa fusco-nigra, 
elytris creberime nigro-irroratis; tarsis posterioribus haud elongatis, articulo quarto 
inferne haud posterius lobato-producto, unguiculo interno quam externo vix duplo 
longiore. Long. 12, lat. 65 m.m. 
The male has the basal joints of the front and middle tarsi a little incrassate 
and very compressed, and furnished beneath with four rows of narrow elongate 
palettes, the marginal hairs are but little developed; the claws on the front feet are 
short but unequal, the anterior one is a little the longer, and is swollen at the base 
and bent at a little distance beyond the swelling so as to give the appearance of an 
emargination close to the base, the hinder one is shorter and its basal thickening 
extends for about half the length of the claw; the claws of the middle tarsi are longer 
than those of the front feet, and are rather slender and nearly equal, the ner 
one however is rather shorter than the other, and is distinctly bisinuate beneath. 
The Australian specimens are generally larger and in proportion narrower than 
those from other localities, and often have the front claw on the middle male feet 
thicker ; these differences however are neither important nor constant. 
Australia, very abundant ; New Zealand, common ; New Caledonia, common ; South Japan, China, Java, 
Assam, Himalaya, Mesopotamia, Egypt, Algeria, Southern and Central Europe, but wanting or extremely 
rare in Northern Europe. 873. 
925. Rhantus elevatus, n. sp.—Ovalis, latiusculus, sat convexus, nitidus, subtus 
niger, prosterno rufescente, antennis pedibusque anterioribus testaceis, posterioribus 
piceis, supra testaceus, capite posterius nigro, rufo-bimaculato, prothorace in medio 
transversim fuscescente, elytris creberrime nigro-irroratis; tarsis posterioribus 
brevibus. articulo quarto inferne leviter posterius lobato-producto, unguiculo interno 
quam externo haud duplo longiore. Long. 113, lat. 6 m.m. 
