326 " On Aquatic Carnivorous Coleoptera or Dytiscidce. 



191. Hydrovatus acuminatus, Motsch., M.C. — Brevis, sat latus, parce subtiliterque 

 punctatus, testaceo-ferrugineus, supra magis castaneus, antennis tenuibus, simpli- 

 cibus. Long. 2, lat. vix. H m.m. 



Very closely allied to Hydrovatus clypealis (No. 179), but smaller and narrower, 

 and with the front and middle tibias, only about half as broad, the antennas more 

 slender but scarcely longer, the hind coxte are also a little broader. 



If, as I suppose, I have both sexes before me, these only differ by the male being 

 slightly more shining than the female. 



China, (Kiu Kiang, Lewis), Formosa, Celebes, Lombock, Sumatra. 6. 



192. Hydrovatus fulvescens, Motsch., M.C. — Oblongo-ovalis, brevis, sat latus, 

 valde nitidulus, castaneo-testaceus, sparsim subtiliter punctatus, antennis brevibus 

 simplicibus ; coxis posterioribus sat fortiter sed sparsim subincequaliter punctatis. 

 Long. If, lat. li m.m. 



A very small species, distinguished by its very shining surface, and sparse fine 

 punctuation : the front tibiae are comparatively slender. I have seen only two 

 individuals, which have the antennae short, the penultimate joints being not so long 

 as broad ; the species is most allied to Hydrovatus acuminatus, but is considerably 

 smaller, narrower, and less convex in form, more shining and more sparsely punc- 

 tured. 



East India, sent by Wehncke. 450. 



193. Hydrovatus fusculus, n. sp. — Brevis, sat latus, nitidus, confertim sat fortiter 

 punctatus, castaneus, antennis tenuibus simplicibus ; coxis posterioribus fortiter 

 crebre punctatis. Long. 2i, lat. l| m.m. 



This species is rather smaller and narrower than Hyphydrus cuspidatus (No. 180), 

 and is of more obscure and uniform colour ; it has the front tibicB much thinner, 

 and the antennae rather more slender. The sexual differences appear to be ex- 

 tremely slight. 



Macassar, Jan., 1874, (Beccari), Formosa, China. Though the specimens from these different localities 

 differ slightly, I cannot notice anything to distinguish them as species. 7. 



194. Hydrovatus fasciatus (Wehncke), n. sp. — Brevis, sat latus, nitidus, confertim 

 minus fortiter punctatus, ferrugineus, prothorace (lateribus exceptis), elytrisque 

 piceo-castaneis ; antennis tenuibus simplicibus ; coxis posterioribus fortiter crebre 

 punctatis. Long. £2, lat. 1§ m.m. 



Extremely similar to Hydrovatus fusculus, but slightly larger and more elongate, 

 a little different in colour, and with the elytra more finely punctured. 



Australia, (Brisbane, Rockhampton). 446. 



