On Aquatic Carnivorous Coleoptera or Dytiscide. 673 
1052. Dytiscus suleatus, Lin., Acilius sulcatus, M.C.—Latus, supra parum con- 
vexus, capite prothoraceque testaceis, signaturis transversis nigris, elytris fusco- 
testaceis, nigro-irroratis, subtus prosterno testaceo, pectore abdomineque nigris, 
hoe lateribus marginibusque ftavo-signatis, pedibus anterioribus testaceis, poste- 
rioribus basi, tibiis tarsisque nigricantibus ; corpore creberrime punctato : antennis 
elongatis tenuissimis. Long. 16, lat. 10 m.m. 
Mas, parum nitidus, corpore superne creberrime punctato. 
Fem., prothorace medio utrinque versus latera subimpresso ibidemque villoso, 
elytris sulcis latis villosis integris. 
In the male the three basal joints of the front tarsi are greatly dilated, the basal 
joint is large, and bears beneath a single very large cupule, the other two joints are 
very short; the undersurface of the tarsus bears besides the large cupule two 
much smaller cupules, and externally two patches of dense hairs bearing very 
minute palettes ; the fringing hairs are elongate and beautifully developed. The 
middle tarsi are not incrassate, but still are a little thicker and have the two apical 
joints more elongate than in the female; the three basal joints have their inner 
and lower edge armed with a tuft of long hairs, of which the basal one is most 
highly developed ; their undersurface has close to the marginal setz a few hairs 
bearing minute palettes. In the female the grooves on the elytra are elongate and 
very broad, they commence very near indeed to the base, and are continued nearly 
to the apex, the inner one is, however, shorter than the one next it, the termina- 
tion of this furrow also is more gradual than that of the others, so that its length 
at the apex is slightly variable. 
The black marks on the head of this species may be said to be three in number, 
one in front of the other—viz., the vertex is black, and there is an angular black 
mark in front of it, and at the sides connected with it, while the third and most 
anterior mark is a triangular black patch, whose outer and front angles reach the 
clypeal suture. The thoracic black mark consists of two lines across the middle, 
more or less connected at their extremities. 
The species varies in the extent to which the black colour of the upper surface is 
developed, and in Scotland a variety is found in which the upper surface is nearly 
entirely black. 
Europe ; from Sweden and Finland to Spain, Russia. 956. 
1053. Dytiscus fasciatus, de Geer, Acilius fasciatus, M.C.—Sat latus, supra 
parum conyexus, testaceus, capite prothoraceque signaturis transversis nigris, elytris 
fusco-testaceis, nigro-irroratis, subtus pectore nigricante, abdomine plus minusve 
nigro-fasciato ; pedibus posterioribus rufescentibus ; corpore creberrime punctato ; 
antennis elongatis tenuissimis. Long, 152, lat. 94 m.m. 
Mas, parum nitidus, corpore superne creberrime punctato. 
