568 On Aquatic Caridvorous Coleoptera or Vytiscidw. 



The male lias the front and middle tarsi dilated, and the claws of the front feet 

 nearly simple : there is no evident diiference in the sculpture of the sexes. 



I have separated this from the numerous forms I have considered as being C. 

 nigritulu!?, chiefly on account of the less dilated male tarsi, and the simple front 

 claws. 



Australia, (Melbourne). 672. 



820. Copelatus subjectus, n. sp. — Ovalis, .sat angustus et elongatus, subde- 

 pressus, nigricans, elytris piceis, prothoracis lateribus elytrorumque basi dilutioribus, 

 antennis pedibusque rufis ; capite crebre subtilius punctulato ; prothorace sublsBvi ; 

 elytris seriebus punctorum tribus vol quatuor distinctis. Long. 6, lat. vix 3 m.m. 



In this species there are on the elytra two very distinct series of punctures, and 

 between them is another series less distinct because the punctures composing it 

 are much fewer in number, i.e. placed at a greater distance from one another ; there 

 is also a more external series which is less regular and distinct. I have seen only 

 two individuals of this species, and suspect they are males, though the tarsi are 

 scarcely perceptibly thickened. 



New Caledonia. 673. 



821. Colymbetes parvulus, Boisd., Agahus pavculus, M.C. — Ublongo-ovalis, baud 

 elongatus, sat depressus, subopacus, fusco-rufus, anterius dilutior, antennis pedi- 

 busque testaceis ; elytris seriebus punctorum obsoletis. Long. 4^, lat. 2j- m.m. 



This little species has the upper surface less shining than usual, owing to its being 

 very finely reticulate or coriaceous ; other sculpture is nearly absent. The sexes 

 are difficult to distinguish, there being only a slightly greater development of the 

 front and middle tarsi in the male. 



Hawaiian Islands. 074. 



822. Copelatus politus, n. sp. — Oblongo-ovalis, depressus, pernitidus, fere laevis, 

 piceus, sujjra magis nigricans, antennis ped:bu.sque rufis; fere lasvigatus. Long. 4, 

 lat. 2 m.m. 



The male has the front and middle tarsi very little dilated, but the intermediate 

 joints of the antennae are broad and flattened, the third joint very strongly so, and 

 the three following ones to a gradually diminished extent. 



New Guinea, (Hatam, July, 1875, Dr. Beccari). 660. 



823. Copelatus insolitus, Chev., M.C. — Oblongus, sat angustus, subdepressus, 

 nitidus, testaceus, prothorace medio late infuscato, elytris fusco-testaceis basi 



