On Aquatic Carnivorous Coleoptera, or DytiscidcB. 665 



1038. Colymbetes pulcher, Clk., M.C. — Ovalis, fere angustus.subtus rufo-obscurus, 

 supra riifo-testaceus, capite verfcice plagaque transversa iuter oculos, prothorace 

 ba&i margineque anteriore in medio plus minusve nigricantibus, elytris creberrime 

 nigro-irroratis, irrorationibus versus suturam coalescentibus ; tarsorum posticorum 

 marginibus posterioribus parum longe ciliatis. Long. 11, lat. 6 m.m. 



In the male the fringing hairs round the heel of the front tarsus are moderately 

 well developed, and the basal palettes are distinctly a little larger than the others. 



This species is of rather more parallel and narrower form than most of its allies, 

 and may be distinguished by the peculiarity that not only is the vertex black, but 

 there is also a patch of dark colour between the eyes. The ciliation of the hind 

 tarsi does not differ much from that of Hydaticus servillianus. I have seen but 

 few specimens, and tliey vary somewhat in size, and in the extent of the black 

 colour on the anterior margin of the thorax ; this is never very conspicuous, and 

 seems to be less so in the male than in the female. In some individuals of this 

 latter sex, some obsolete rugse or impressions may be observed on the lateral parts 

 of the thorax, but in others they are quite absent. 



Australia, (Brisbane; Clarence River ; South Australia). 1007. 



1039. Tlydaticus servillianus, Aube, M.C. — Ovalis, elongatus, rufo-testaceus, 

 vertice nigro, elytris creberrime nigro-irroratis, irrorationibus versus suturam 

 coalescentibus, pectore abdomineque picescentibus ; tarsorum posticorum marginibus 

 posterioribus hand longe ciliatis. Long. 12, lat. G\ m.m. 



In the male the fringing hairs round the heel of the front tarsus are largely 

 ■developed and conspicuous, and there is a good deal of variety in the size of the 

 palettes of the undersurface, one of the two at the base being conspicuously large ; 

 the female has some irregular very short impressions scattered on the lateral parts 

 of tlie thorax. 



The species much resembles some of the varieties of Dytiscus leander (No. 1032), 

 but is larger in size and moie elongate in form ; the male can be readily dis- 

 tinguished from D. leander by the fringing hairs of the front feet, and the female 

 by the presence of thoracic impressions ; the ciliation of the hind margins of the 

 posterior tarsi is the same as in D. leander. 



I have seen but few specimens of this species, it seems to be rather variable in 

 size, and in the amount of condensation of the black irrorations on the wing-cases, 

 and sometimes the thorax appears black at the base in the middle. The thoracic 

 sculpture of the females seems also to be somewhat variable. 



South Africa, (Caffraria, Cape of Good Hope). 1006. 



1 040. Hydaticus palliatus, Aube, M.C. — Obion go-ovalis, robustus, sat convexus, 

 subtus piceus, prosterno rufo, supra capite thuraceque rufo-testaceis, illo vertice 



