388 On Aquatic Carnivorous Coleoptera or DijtiscidiP. 



Mas, antennis apicem versus incrassatis ; tibiisanterioribus leviter curvatis, tarsis 

 articulis basalibus fortiter dilatatis ; tarsis intermediis clongatis, articulis basalibus 

 subdilatatis. 



Fem., antennis ijracilibus ; tarsis auterioribus et intermediis basi sat dilatatis. 



Intermediate between Sternopi'iscus tarsalis, and H3'droporus multimaculatus (No. 

 365), smaller than the former, and with the antennae of the male not so long, and 

 the middle tarsi much less elongate : rather broader than Hydroporus multimaculatus, 

 with the yellow colour more predominant on the head and thorax, the sculpture of 

 the elytra not quite so fine ; with the antennae of the male having the apical joints 

 thicker than the middle ones, and the intermediate tarsi a good deal more elongate. 



Australia, (received from Herr Welmcke). IGG. 



367. Sternopriscus oscillator, n. sp. — Ovalis, subopacus, densissime punctatus, niger, 

 supra testaceo nigroque irregulariter variegatus, pedibus testaceis, antennis basi 

 testaceo, apice fusco ; prothorace utrinque plica bene elevata, medio leviter 

 transversim impresso. Long. 2f, lat. If m.m, $. 



Mas, major, antennis longioribus, fere simplicibus, tibiis auterioribus leviter 

 curvatis, tarsis evidenter . 5 -articulatis, articulis basalibus dilatatis; tarsis intermediis 

 elongatis articulis basalibus leviter dilatatis. 



Fcm., antennis gracilibus brevibiis, tarsis auterioribus et intermediis brevioribus 

 basi fortiter dilatatis. 



Allied to S. wehnckei, but witli the sexes more different ; the male is larger and 

 more elongate than in that species, and the antennae are more elongate and appear 

 therefore less thickened towards the apex, the front tarsi are larger and more 

 distinctly 5-jointed, and the middle legs are considerably longer and thicker. The 

 female is much more like S. wehnckei but the upper svirface is of more obscure colour, 

 the form is narrower, and the surface not so dull. 



Axistralia, (Adelaide). 1133. 



36S. Sternopriscustasmanicus,n.sp. — Oblongo-ovalis,subopacus,densiuspunctatus, 

 niger, supra testaceo-varicgatus, prothoi'ace lateribus late testaceis; hoc utrinque 

 plica sat elevata, ante basin in medio deprcsso ; antennarum basi j^edibusque 

 testaceis; antennis versus apicem incrassati.s, articulo ultimo prcesertim latiore, 

 angulo apicali interne producto acuto, tibiis anterioribus intus minute emarginato, 

 tarsis evidenter 5 -articulatis, articulis 3 basalibus dilatatis; pedibus intermediis 

 elongatis, parum crassis, tarsis elongatis, superne longe ciliatis. Long. 21, lat. \h m.m. 



T have seen only a single male of this species ; it may be readily recognized by 

 the peculiar incrassation of the terminal joint of the antennas. 



Tasmania. 1134. 



