On Aquatic Carnivorous Woleoptera or Dytiscide. 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 coxz 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, Amurland). 990, 
1086. Dytiscus fasciatocollis, Harr., Hydaticus 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. 143, 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 Huropean Dytiscus cinereus (No. 1088) it is, 
nowever, a little narrower in front, and the anterior border of the hind coxe 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 
female is quite wanting in D. cinereus. 
Dnited States of North America, 991. 
4U2 
