392 On Aquatic Carnworous Coleoptera or Dytiscide. 
This species at first sight exactly resembles Hydroporus nigro-adumbratus, (No. 
372) but it has the punctuation of the upper surface less; the only individual | 
have seen, I judge, from its short broad front tarsi, to be a male; the claws are 
quite small. 
West Australia. 420. 
374. Hydroporus insculptilis, Clk., M.C.-—Ovalis, convexus, sine pubescentia, 
nitidus, piceus, capite pedibus antennisque rufis, his versus apicem fuscis ; thorace 
elytrisque sparsim subtiliter punctatis ; coxis posterioribus fere impunctatis. Long. 
94, lat.13 m.m. 
I have seen but a single individual of uncertain sex, it has the front tarsi moder- 
ately broad. The species has the front tibie more slender than the two preceding 
species, and has quite the appearance of a small Hydroporus such as H. melanarius 
(No. 555). 
Australia, (Victoria). 421. 
I. 34.—Genus HEROPHYDRUS. 
Elytral ridge gradually raised till near the extremity, then suddenly diminishing ; 
hind coxal cavities approximate ; hind portion of epipleura very narrow, humeral 
area limited behind by a well marked raised line. Mesosternal fork not connected 
with the intercoxal process of the metasternum. 
Only six species are known, they inhabit Madagascar and continental Africa, and 
one extends its range to southern Hurope. 
375. Herophydrus heros, (Dej.) n. sp.—Sat angustus, convexus, nitidus, piceus 
elytris rufo-signatis, crebre fortiter punctatus, antennis pedibusque rufis ; clypeo 
mmarginato, thoracis angulis posterioribus obtusis. Long. 6, lat. 32 m.m. 
The head is finely and moderately sparingly punctured, rather paler in colour than 
the other parts. The punctures of the thorax are coarse and numerous. The elytra 
also are evenly and rather coarsely punctured ; the red marks on them are variable, 
and consist chiefly of a larger irregular mark near the shoulder, anda smaller one 
near the apex, with one or two others near the outer margin between them, The 
