.■)D2 On Aquatic Carnivorous ColeojAcra or Jhjtiscidce. 



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 I 

 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, 

 uitidus, piceas, capite pedibus antennisque rufis, his versus apicem fuscis ; thorace 

 elytrisque sparsim subtiliter punctatis ; coxis posterioribus fere impunctatis. Long. 

 2i, lat.l.^i m.ra. 



I have seen but a single individual of uncertain sex, it has the front tarsi moder- 

 ately broad. The species has the front tibiie 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. 3A.— Genus HEROPBYDEUS. 



Elytral ridge gradually raised till near the extremit}', 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 Europe. 



375. Herophydrus heros, (Dej.) n. sp. — Sat angustus, convexus, nitidus, piceus 

 elytris rufo-signatis, crebre fortiter puuctatus, antennis jDedibusque rufis ; clypeo 

 immai'ginato, thoracis angulis posterioribus obtusis. Long. 6, lat. 3i 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 el3't)a 

 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, and a smaller one 

 near the apex, with one or two otliers near the outer margin between them. The 



