On Aquatic Carnivorous Coleoptera or Dytiscidce. 385 



The species are best distinguished by the sexual characters, which are frequently- 

 extraordinary ; the males of some species are twice the bulk of the females, and 

 may be the possessors of extraordinary structures on their antennae and middle 

 legs. They are peculiar to Australia.* 



359. Sternopriscus browni,n.sp. — Oblongo-ovalis,subopacus, dense siibtiliter punc- 

 tatus subtiliterque pubescens, nigricans, capite fusco obscure testaceo-maculato, 

 prothorace testaceo medio late infuscato, utrinque striga impressa, elytris fuscis 

 indistincte testaceo-raaculatis, antennis pedibusque fusco-testaceis ; corpore subtus 

 dense gequaliterque punctate. 



Mas, major, (long. 3s m.m.) antennis articulis 2 et 3 elongatis, 4 et 5 brevibus, 6 

 sat elongate, 7-11 distortis ; tibiis anterioribus leviter curvatis, intus emarginatis ; 

 pedibus intermediis elongatis, femoribus longius ciliatis, tibiis curvatis, tarsis 

 articulis 4 et 5, (4° magno, 5" dilatato) externe spongiosis interne glabris; tarsis 

 posterioribus crassis utrinque longius ciliatis. 



Fern., minor, (long. 2| m.m.) antennis pedibusque simplicibus. 



Head very finely but somewhat closely punctured, fuscous but with some 

 indistinct spots on the front, and a still more indistinct one on the vertex, yellowish. 

 Thorax and elytra densely and finely punctured ; sides of the thorax nearly straight, 

 the middle of the base forming a very evident angular projection. Elytra rather 

 rounded at the sides, and deflexed towards their apex which is rather pointed. 



Avistralia, (King George's Sound). Given by the lamented Edwin Brown. 159. 



360. Sternopriscus obscurus, n. sp. — i>, Ovalis, opacus,densesubtilissimepunctatus 

 subtiliterque pubescens, nigricans, capite, prothorace, antennis pedibusque obscure 

 fusco-rufis ; corpore subtus dense, sequaliter, subtiliterque punctate. Long. 3 m.m. 



I am only acquainted with the female of this species, which is very similar to 

 the female of S. browni, but differs as follows : S. obscurus is rather larger and 

 broader, and more obscurely coloured, and rather more finely punctured, and the 

 antennae and the apical joints of the front and middle tarsi are more elongate. 

 The male will probably prove to have some difference in its sexual characters from 

 those of S. browni. 



Australia, (King George's Sound). 160. 



• In addition to the ten species of which descriptions follow, there is yet another that should be 

 included in the genus, viz., Hydroporus hansardi, Clk., (No. 1,37G huj. op,), near No. 361. 



