On Aquatic Carnivorous Coleoptera or DytiscidcB. 409 



transversim in medio, elytrorum signaturis, f.nteanis pedibusque rufescentibus ; 

 clvpeo antice rotundato, sed vix marginato, cajiite dense strigoso-punctato ; thorace 

 elytrisque crebre fortiter punctatis ; corpore sultus fortiter punctato. Long. 3 J, 

 lat. 2 m.m. 



The marks on the elytra consist of a broad irregular sub-basal fascia which does 

 n.)t quite reach the suture, and some irregular marks towards the extremity which 

 vary in their extent. 



The four individuals I have examined all have the tarsi simple. 



Australia, (New South Wales, Sidney). 190. 



425. Chostonectes latus, n. sp. — Ovalis, latiusculiis, sat convexus, posterius sub- 

 acuminatus, subopacus, evidenter pubescens, nigricans, eapite, thoracis lateribus, 

 elytrorum signaturis basalibus et externis, antennis pedibusque feiTugineis ; clypeo 

 antice rotundato sed vix marginato, eapite crebre punctato ; thorace elytrisque 

 crebre sat fortiter punctatis ; corpore subtus fortiter punctato. Long. 4t, lat. 

 2 1 m.m. 



Mas, tarsis anterioi'ibus et intermediis articulis sat fortiter dilatatis. 



Fern., tarsis anterioribus et intermediis latiusculis, articulis basalibus baud 

 dilatatis. 



Australia, (Victoria, Mens Miicedon). 191. 



426. Hydroporus nebulosus, MacLeay, Tr. N.S.W. 1871, p. 123. — Late ovali-s, 

 brevis, sat convexus, opacus, evidenter pubescens, ferrugineus, elytris ferrugineo 

 fuscoque obscure variegatis ; clypeo rotundato, sat distincte marginato, eapite 

 subtiliter striguloso ; elytris crebre fortiter minus profunde punctatis, corpore 

 subtus fortiter punctato. Long. 31^, lat. 2|-, m.m. 



The three individuals I have seen of this species have the tarsi slender, and are 

 perhaps females. 



Australia, (Sidney). 189. 



427. Hydroporus gigas, Boh., M.C. — Ovalis, sat latus et convexus, subnitidus, 

 evidenter pubescens, pectore abdomino, antennis pedibusque rufis, supra nigricans, 

 eapite anterius et in medio, prothorace lateribus, elytris fascia interrupta basali 

 maculisque externis ferrugineis ; corpore creberrime sat fortiter fere cequaliter 

 punctato ; clypeo anterius subrotundato, indistincte incrassato, sed baud marginato, 

 Long. 61, lat. 3|, m.m. 



Mas, tarsis anterioribus et intermediis bene dilatatis parallelis, unguiculis 

 (prEesertim anterioribus) magis elongatis. 



Australia and Tasmania, (Clarence River, INIelbourne, Sidney). 192. 



