On Aquatic Carnworows Coleoptera or Dytiscide. ALL 
plus minusve testaceo-ornatus, antennis pedibusque rufo-testaceis, illis versus 
apicen plus minusve infuscatis, corpore subtus densissime eequaliter punctato, 
subopaco. Long. 4%, lat. vix 2} m.m. 
The male has the front and middle tarsi rather broader than in the female; the 
front ones with a single unguiculus, which bears a tooth at the extreme base, the 
middle tibize are a little curved, and the hind femora have a large triangular dila- 
tation near the extremity. The species though extremely similar to Hydroporus 
interrogationis can scarcely be considered a variety of it, as the sculpture is very 
distinctly coarser. 
New Zealand, (Canterbury). 424. 
431. Hydroporus duplex, Sharp, Ent. Mo, Mag. XIII, p. 21.—Oblongo-ovalis, 
vix pubescens, dense zequaliter sat fortiter punctatus, subopacus, niger, vel fuscus, 
antennis, pedibus prothoracisque lateribus testaceis, elytris obsolete testaceo-ornatis, 
corpore subtus densissime eequaliter punctato, subopaco. Long. 4%, lat. 2 m.m. 
This species is extremely close to Hydroporus wakefieldi, but is a little larger, 
and more indistinctly ornamented with yellow, and the thorax is a little more 
rounded at the sides; the male characters are the same as in H. wakefieldi, and 
it is possible that specimens from other localities may prove the two not to be 
distinct. 
New Zealand, (Auckland). 425. 
432. Hydroporus uncifer, n. sp.—Oblongo-ovalis, brevissime pubescens, dense 
eequaliter sat subtiliter punctatus, subopacus, niger, supra testaceo fuscoque 
variegatus, antennis pedibusque testaceis ; prothorace elytris angustiore ; corpore 
subtus densissime zequaliter punctulato, fere opaco. Long. 5, lat. 2? m.m. 
The male is larger than the female, and has the front and middle tarsi broadly 
dilated, the front ones bear each a single claw, which is abruptly curved and has a 
tooth at the extreme base ; the middle tibiz are a little curved; and the hind 
femora have near the extremity a large angular dilatation the apex of which is 
acute and often a little hooked. Though the species is in most respects allied to 
H. wakefieldi, yet it differs by the prosternal process being broader and much less 
compressed towards the extremity. 
New Zealand, (Wellington and Dunedin). 426. 
433. Hydroporus gilbertii, Clk., M.C.—Oblongo-ovalis, brevissime pubescens, 
densissime subtiliter punctatus, opacus, ferrugineo-testaceus, elytris minus distincte 
nigro-lineatis, thorace basi utrinque rugositatibus distinctis ; corpore subtus omnium 
densissime subtilissimeque punctato, opaco. Long. 54, lat. 2? m.m. 
TRANS. ROY, DUB. SOC., N.S., VOL. IT. 3) Hi 
