On Aquatic Carnivorous Coleopter:i or DytiscidcB. 585 



867. Copelatus clarki (Welmcke), n. sp. — Ovalis, elongatus, sat depressus 

 piceus, capite prothoracisque lateribus dilutioribus, antennis pedibusque testaceis ; 

 elytris striis pluriinis (clrciter septera) posterius abbreviatis, alternis subtilioribus et 

 versus apiceiu brevioribus, alia^ue margmali brevissima. Long. 7, lat. Si m.m. 



In this species the first stria is remote from the suture, and the other strias are 

 narrowly separated from one another, the interval between the first and second 

 being however double that between the others, because the intervening stria is absent, 

 or is represented only by some widely separated linear marks. The male has the 

 front and middle tarsi greatly dilated, the front tibise slightly curved at the base, 

 so that the l;asal portion is a little more slender and is slightly sinuate internally. 

 The sculpture does not differ in the sexes. 



Australia, (Cape Yoi-k). G76. 



868. Copelatus carinatus, n. sp. — Fern., Oblongo-ovalis, vix angustulus vel elon- 

 gatus, minus depressus, sat nitidus, piceus, supra nigro piceus, capite et pro thoracis 

 elytrorumque lateribus dilutioribus, antennis pedibusque rufis; prothorace strigulis 

 subtilissimis paucis ; elytris striis octo subtilibus, interna a sutura remota, 2% 4^ 

 6*que posterius multo brevioribus ; striaque marginali brevissima ; prosterno in 

 medio alte compi-esso-carinato. Long. 7, lat, 3t m.m. 



The strice of the elytra are rather peculiar in this species, there are eight distinct 

 fine striaj on each wing-case the first of which is placed far from the suture ; between 

 it and the suture there is however, quite at the base, the commencement of another 

 stria ; the 2nd, 4th, and 6th striae are much shorter behind than the others, while the 

 7th is obsolete in front. I have seen only a single individual. 



Africa, (Guin^e Portugaise, coll. Bonvouloir). 705. 



Group 12. (Nos. 869 to 886). 



Elytra with a submarginal stria and nine or ten other striae on each. 



In Nos. 869 and 870, the second stria is nearly or altogether wanting, and the first 

 is much abbreviate at the base ; in the other species the ten striae are present, but 

 some of them (especially the internal ones) may be more or less abbreviate at the 

 base. 



869. Copelatus prolongatus, n. sp. — Robustus, ovalis, sat latus et elongatus, 

 nitidior, niger, capite piceo, prothorace lateribus anguste ferrugineis, elytris apice 

 sordide testaceo ; antennis pedibusque rufis ; prothorace maris fare laevigato. 



