530 On Aquatic Carnivorous Coleoptera or Dytiscide. 
portion of the elytra more indistinct than it is in A. neglectus, and the prothorax 
decidedly a little longer. 
Northern Europe, and Siberia ; (Sweden, Finland, Denmark, Germany, Kirgisia, coll. Castlenau). 744. 
745. Agabus politus, Reiche, M.C.—Ovalis, latiusculus, pernitidus, haud convexus, 
niger, supra subzenescens, prothoracis elytrorumque lateribus obscure ferrugineis, 
antennis pedibusque anterioribus rufis, posterioribus piceis; elytris crebre fere 
obsolete reticulatis. Long. 10, lat. 5% m.m. 
The male has the three basal joints of the front and middle tarsi a little incrassate 
and furnished beneath with moderately long glandular hairs, the claws of the front 
feet are slender and simple but rather long. 
The species is closely allied to Agabus gagates, but is slightly larger, and the 
reticulation of the upper surface is more effaced, and the lateral margin of the 
prothorax is rather broader. When immature this species is entirely pale beneath. 
Algeria. 777. 
746. Agabus gagates, Aubé, Spec. p. 306.—Ovalis, latiusculus, nitidus, haud 
convexus, subtus prosternu mesosternoque ferrugineis, pectore abdomineque piceis, 
supra enescens, prothoracis elytrorumque lateribus plus minusve rufescentibus ; 
antennis pedibusque rufis ; elytris dense subtiliter reticulatis ; prothorace margine 
laterali angusto. Long. 9, lat. 5 m.m. 
The male has the three basal joints of the front and middle tarsi slightly incrassate, 
and furnished beneath with moderately long glandular hairs ; the claws of the front 
feet are rather long and nearly simple, but each has underneath a minute thickening 
at some distance from the base, causing the outline to appear a little sinuate. 
The species greatly resembles the larger individuals of Dytiscus chalconotus (No. 
739), but is readily distinguished by the narrower pronotal margin. 
North America, (Lake Superior, Pennsylvania). 773, 
747. Agabus discors, Lec., M.C.—Oblongo-ovalis, haud nitidus, nee convexus, 
niger, antennis pedibusque rufis, femoribus picescentibus ; supra profunde striolato- 
reticulatus ; prothorace lateribus rotundatis, angulis posterioribus obtusis; antennis 
elongatis. Long. 11, lat. 5¢ m.m. 
The male has the front and middle tarsi distinctly incrassate, and amply provided 
beneath with dense elongate hairs not bearing palettes; the anterior claws are 
elongate, little curved, and distinctly sinuate beneath : two joints of the hind tarsi 
have swimming hairs heneath. The female I have not seen. 
This species has the broad prosternal process greatly compressed, and the middle 
