518 On Aquatic Carnivorous Coleoptera or Dytiscide. 
According to Professor Sahlberg this is the species Mannerheim intended to call 
A. adpressus, but is not the one described by Aubé under that name, (vide No. 719). 
Dauria. 726. 
719. Agabus adpressus, Aubé, M.C.—Oblongo-ovalis, niger, nitidus, supra 
zenesceus, clypeo rufescente, antennis pedibusque rufis; prothorace lateribus sat 
rotundatis, angulis posterioribus obtusis. Long. 7, lat. 3% m.m. 
There is a difference in the sculpture of the sexes, the female having the elytra 
extremely finely reticulate, while in the male the reticulation is so obsolete as to 
easily escape detection: the male has the basal joints of the front and middle tarsi 
a little incrassate, and furnished beneath with glandular hairs, and the claws of 
the front feet are elongate and slightly sinuate beneath. The prosternal process 
in this species is not broad, and is but little compressed laterally, and is feebly 
punctulate at the sides, the metasternal cavity is rather short and narrow. The 
species is closely allied to Agabus sahlbergi, but is smaller, and the prosternal 
process is rather shorter flatter and more punctate, and the sides of the thorax are 
more contracted at the hind angles. 
Arctic Siberia, (Dudinka, J. Sahlberg). 738. 
Group 12. 
Prosternal process small, much compressed ; middle legs very approaimate so that 
the metasternal groove between these is rudimentary and obscure. Sides of thorax 
rounded. Coxal lines rather deep and a good deal divergent in front. 
Four species from both Old and New Worlds. 
720. Dytiscus wasastjernze, Sahl., Agabus Wasastjerne, M.C.—Oblongo-ovalis, 
niger, supra subznescens, sat nitidus, antennis pedibusque rufis; prothorace 
lateribus rotundatis, angulis posterioribus rotundato-obtusis, margine laterali haud 
crasso; elytris dense evidenter reticulatis et punctulatis. Long. 7, lat. 4 m.m. 
The sexes are very similar; in the male the three basal joints of the front and 
middle tarsi are scarcely incrassate but are furnished beneath with glandular hairs. 
The apical joints of the antennze in this species are rather more elongate and slender 
than in the allies. 
Northern Europe; (Sweden, and Finland). 739. 
