412 On Aquatic Carnivorous Coleoptera or Dytiscide. — 
In the male the front and middle tarsi are rather elongate and moderately broad, 
the front ones furnished with a single abruptly curved claw, which bears a tooth 
at the base ; the hind femora are dilated towards the extremity and furnished with 
a sharp hooked tooth. In the female the front tarsi are very slender and com- 
pressed, the second and third joints showing a well marked constriction, or neck, 
at the base. | 
Australia. 427. 
434, Hydroporus blakei, Clk., M.C.—Oblongo-ovalis, latiusculus, brevissime 
pubescens, densius subtiliter punctatus, opacus, ferrugineus ; elytris fuscis, signa- 
turis externis lineaque suturali vage ferrugineis ; prothorace basi squall; elytris 
apicibus subprolongatis, sinuatim truncatis ; corpore subtus densius punctato, opaco, 
coxis posterioribus interne fortius punctatis, Long. 45, lat. 23 m.m. 
In the male the front and middle tarsi are a good deal dilated, the third joint is 
divided nearly to the base so that the lobes are elongate and slender ; on the front 
feet there is a single unguiculus, which is short, thick, and sinuate, and has a sharp 
tooth at the base; the intermediate tibie are curved and incrassate, and bear a 
large angular projection on the middle externally. 
Australia and Tasmania. 428, 
435, Antiporus curtulus, n. sp.— Latus, brevis, omnium brevissime pubescens, 
densissime subtiliter punctatus, opacus, testaceus, prothorace anterius et posterius 
infuscato, elytris nigro-fuscis, sutura, margine externo signaturisque versus latera 
testaceis ; elytris apicibus sub-prolongatis, emarginato-truncatis ; corpore subtus 
densissime subtilissime punctato, opaco. Long. 35, lat. vix 2 m.m. 
I have seen only females, which are very similar to that sex of Hydroporus 
blakei, but the species is readily distinguished by the smaller size and shorter and 
broader form, the distinct markings of the elytra, and the rather finer and denser 
punctuation of the under surface. 
It is possible that this species may prove to be the Hydroporus bakewelli, Cik. 
Australia, (Sidney). 429. 
I. 38.—Genus NECTEROSOMA. 
The true fourth joint of the front tarsus is conspicuously exposed at the base 
of the terminal joint. This character is more conspicuous in the males than in the 
females, and is frequently accompanied by a great elongation of the terminal 
