530 On Aquatic Carnivorous Coleoptera or Di/tiscida'. 



portion of theelytra more indistinct than it is in A. neglectu?, and the piothorax 

 decidedly a little longer. 



Northern Europe, and Siberia ; (Sweden, Finland, Denmark, Germany, Kirgisia, coll. Castlenan). 744. 



745. Ao-abus politus, Reiche, M.C. — Ovalis, latiusculus, pernitidus, haud convexus, 

 niger, supra suba3nescens, protlioraci-s elytrorumque lateribus obscure ferrugineis, 

 Jintennis pedibusque anterioribus rufis, posterioribus piceis ; elytris crebre fere 

 obsolete reticulatis. Long. 10, lat. 5i 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 

 pro thorax is rather broader. When immature this species is entirely pale beneath. 



Algeria. 777. 



746. Ao-abus gagate?, Aube, Spec. p. 306. — Ovalis, latiusculus, nitidus, haud 

 convexus, subtus prosterno me-sosternoque 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, Lee, 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. 5f 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 

 elono-ate, little curved, and distinctly sinuate beneath : two joints of the hind tarsi 

 have swimming hairs beneath. The female I have not seen. 



This species has the broad prosternal process greatly compressed, and the middle 



