On Aquatic Carnivorous Coleoptera or DijtisciJcii. 411 



plus minusve testaceo-ornatus, antennis pedibusque rufo-testaceis, illis versus 

 apiceni plus minusve infuscatis, corpore subtus densissime sequaliter punctato, 

 subopaco. Long. i\, lat. vix 2i m.m. 



The male has the front and middle tarsi rather broader than in the female ; the 

 front ones with a single uiit>'uiculus, which bears a tooth at the extreme base, the 

 middle tibise are a little curved, and the hind femora have a large triangular dila- 

 tation near the extremity. The species though extremely similar to Hydroporus 

 inter rogationis 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 requaliter sat fortiter punctatus, subopacus, niger, vel fuscus, 

 antennis, pedibus protlioracisque lateribus testaceis, elytris obsolete testaceo-ornatis, 

 corpore subtus densissime cequaliter punctato, subopaco. Long. 4f, lat. 2i- m.m. 



This species is extremely close to Hydrojiorus 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 

 sequaliter sat subtiliter punctatus, subopacus, niger, supra testaceo fuscoque 

 variegatus, antennis pedibusque testaceis ; prothorace elytris angustiore ; corpore 

 subtus densissime sequaliter punctulato, fere opaco. Long. 5, lat. 2i 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 tibice arc 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 prostei'nal process being broader and much less 

 compressed towards the extremity. 



New Zealand, (Wellington and Dunedin). 42G. 



433. Hydroporus gilbertii, Clk., M.C. — Oblongo-ovalis, brevissime pubescens, 

 densissime subtiliter punctatus, opacus, ferrugineo-testaceus, elyti'is minus distincte 

 nigro-lineatis, thorace basi utrinque rugositatibus distinctis ; corpore subtus omnium 

 densissime subtilissimeque punctato, opaco. Long. 5l, lat. 2! m.m. 



TRANS. ROT. DUB. SOC, N.S., VOL. II. 3 U 



