414 On Aquatic Carnivorous Colcoptera or DytiscidcB. 



the middle tibiae are greatly curved. The female has the second and third joints 

 of the front tarsi each longer than broad, and slender at the base. The species 

 much resembles those oval varieties of Hydroporus penicillatus in which the 

 elytra are quite even, but is readily distinguished by the diflerences in the front 

 tarsi, and the more developed sexual characters. The female is broader behind 

 the middle, and is subsinuate at the sides before the extremity. 



Australia, (King George's Sound). 431. 



438. Necterosoma schmeltzi, (Wehncke), n. sp. — Ovalis, baud latus, brevissime 

 pubescens, densissime punctatus, fere opacus, niger, pedibus antennisque rufes- 

 centibus, capite anterius, prothorace lateribus elytrisque signaturis transversis 

 undulatis testaceis ; capite angustulo ; prothorace icedio baud omnino subtiliter 

 punctato ; corpore subtus densissime punctulato, fere opaco. Long 4i, lat. 2i ni.m. 



The male has the front tarsi moderately, the middle ones broadly dilated, the 

 front tibia3 are only moderately stout, and have a moderately deep notch in the 

 middle of the inner edge, the middle tibite are a little curved. In the female the 

 front tarsi are slender with the second and third joints elongate. The species is 

 readily distinguished by the colour and markings. 



Australia, (Sidney). 432. 



439. Hydroporus undecimlineatus, Bab., M.C — Ovalis, brevissime pubescens, 

 densissime punctatus, opacus, rufus, elytris lineis maculisque interjectis nigris ; 

 corpore subtus densissime punctato, opaco. Long. 4, lat. 21 m.m. 



In the male the front and middle tarsi are much dilated, but the third joint of 

 the front ones is longer than broad, the front tibiae are very thick, and have a large 

 excision in the middle of the inner edge, the middle tibiae are a little curved. In 

 the female the front tarsi are elongate and slender, the second and third joints 

 having a peculiarly elongate and slender basal portion. The species is very close 

 to Hydroporus dispar, and is just intermediate between it and H. wollastoni ; but is 

 rufous beneath, and has tbe marks of the elytra more separate than in H. dispar, 

 the front tibiai are not so extremely Isroad in the male and have the notch less ; 

 and in the female the second and third joints of the front tarsi are much more 

 constricted on their basal portion, than in H. disjmr female. The male is 

 readily distinguished from that sex of H. wollastoni, by the thick front tibiae with 

 very large excavation ; the female appears to differ from the corresponding sex of 

 H. wollastoni only by the rather more coarsely punctured upper surface. 



Australia. (Clyde River). 433. 



Hydroporus undecimlineatus, Bab., was stated bj- its describer to have been found in South America, 

 but I i'eel no doubt that this locality was given in error. 



