On Aquatic Carnivorous Coleoj^tera or Dytiscidce. 693 



In the male the front tarsi bear large palettes beneath, the smaller ones are 

 large, and of the usual three larger ones only one is conspicuously larger than the 

 small palettes ; the number of these palettes is altogether only fifteen, so that 

 there are but twelve in addition to the three basal ones : the claws are considerably 

 elongate, and a little unequal : on the middle legs the tarsi are not incrassate, 

 and have no palettes beneath, but the claws are larger than in the female. 



This species is readily distinguished from the others allied, by the fact that the 

 front border of the hind coxjb is not quite so approximate to the middle coxal 

 cavities. The smaller number of palettes on the front tarsi of the male, and 

 their complete absence on the middle tarsi is peculiar to this species. It varies a 

 little in size, and there is sometimes only one angular mark on the middle of the 

 head, the more anterior mark present in some specimens being then absent. 



Europe and Eastern Siberia, (Alsatia, Germany, Hungary, AmurlanJ). 990. 



1086. Dytiscus fasciatocollis, Harr., Ilydaticus fasciatocollis, M.C. — Robustus, 

 nitidus, rufus, supra testaceus, capitis vertice et signaturis prothoraceque fasciis 

 duabus magnis nigris, elytris creberrime nigro-vermiculatis ; elytrorum epipleuris 

 angustis ; tarsis posterioribus crassis. Long. \il, lat. vix 9 m.m. 



In the male of this species the palettes on the front tarsi are of large size, the 

 three larger ones are conspicuously larger than the rest, these being twenty-three 

 in number, differing but little inter se in size, and all of them rather large. The 

 intermediate tarsi have the three basal joints somewhat incrassate, and furnished 

 beneath with twelve rather large palettes, four on each joint, these twelve palettes 

 form two perfectly regular longitudinal series. In the female there is a peculiar 

 sexual sculpture, the elytra near the sides showing numerous fine, but rather deep 

 punctures, these are dense at the base, but are wanting on the apical portion of 

 the wing-case. 



The black bands on the thorax are large, so that the thorax is divided into three 

 zones of colour, of about equal lengths, — black in front, yellow in the middle, 

 black at the base ; the anterior black zone generally reaches the front margin, but 

 occasionally the black colour is absent from the anterior margin in front of the 

 transverse series of punctures : the black colour on the elytra is largely developed. 



The species greatly resembles the European Dytiscus cinereus (No. 1088) it is, 

 Juowever, a little narrower in front, and the anterior border of the hind coxae is 

 not quite so approximate to the middle coxal cavity ; the male has less numerous 

 palettes on the front and middle tarsi, and the peculiar sexual punctuation of the 

 lemale is quite wanting in D. cinereus. 



United States of North America. 991. 



4 u 2 



