Al4 On Aquatic Carnivorous Coleoptera or Dytiscide. 
the middle tibiz 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 differences 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, haud latus, brevissime 
pubescens, densissime punctatus, fere opacus, niger, pedibus antennisque rufes- 
centibus, capite anterius, prothorace lateribus elytrisque signaturis transversis 
undulatis testaceis; capite angustulo; prothorace medio haud omnino subtiliter 
punctato ; corpore subtus densissime punctulato, fere opaco. Long 42, lat. 22 m.m. 
The male has the front tarsi moderately, the middle ones broadly dilated, the 
front tibiz are only moderately stout, and have a moderately deep notch in the 
middle of the inner edge, the middle tibize 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. 2 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 tibize are very thick, and have a large 
excision in the middle of the inner edge, the middle tibiz 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. woliastoni ; but is 
rufous beneath, and has the marks of the elytra more separate than in H. dispar, 
the front tibiz are not so extremely broad 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. dispar female. The male is 
readily distinguished from that sex of H. wollastoni, by the thick front tibize with 
very large excavation; the female appears to differ from the corresponding sex of 
H. wellastoni only by the rather more coarsely punctured upper surface. 
Australia. (Clyde River). 433. 
Hydroporus undecimlineatus, Bab., was stated by its describer to have been found in South America, 
but I feel no doubt that this locality was given in error, 
