528 On Aquatic Carnivorous Coleoptcra or Dytiscidce. 



740. Agabus altaicu^, Gebl., M.C. — Ovalis, vix convexus, nitidus, iiigcr, supra 

 jEnescens, prothoracis elytrorumque lateribus plus minusve rufescentibus, autennis 

 pedibusque rufis, pobturioiibus picescentibus ; elytris dense subtiliter reticulatis 

 subtiliterque subpunctatis. Long. 7, lat. 4 m.m. 



The male has the three basal joints of the front and middle tarsi slightly incras- 

 sate, and furnished beneath with moderately long glandular hairs ; the claws of the 

 front feet are moderately long, and almost simple, there being only a very slight 

 emargination beneath near the base ; the apical ventral segment is rugose at the 

 apex. 



The species is very closely allied to Dytiscus chalconotus, but is smaller, and 

 has the metasternal groove considerably smaller ; and the sculpture of the elytra 

 shows more^distinctly than in D. chalconotus, that the reticulation has excessively 

 fine punctures placed on it. 



Siberia. 772. 



741. Dytiscus vittiger, Gyll., Agahus vittiger, M.C. — -Oblongo-ovalis, convexus, 

 niger, nitidus, supra plus minusve renescens, antennis pedibusque rufis, feraoribus 

 picescentibus ; elytris evidenter reticulatis, punctis subseriatis majoribus ; pone 

 medium vitta parvula laterali maculaque apicali minuta pallidis ; prothorace angulis 

 posterioribus rotundatis. Long. 82, lat. 4^ m.m. 



The male has only an extremely slight thickening of the basal joints of the front 

 and middle tarsi, and they are furnished beneath with short glandular hairs, and 

 the claws of the front feet are rather elongate and nearly simple ; there is no 

 difference in the sculpture of the upper surface in the sexes ; but the apical ventral 

 segment is in the male very deeply strigose, while in the female it is pinched up in 

 the middle, so as to form a short very elevated plica at the apex. 



Northern Europe, (Sweden; Finland to 68° 30', Sahlberg). 759. 



742. Agabus negleotus, Er., M.C. — Ovalis, vix convexus, subnitidus, niger, supra 

 senescens, prothoracis elytrorumque lateribus plus minusve rufescentibus, antennis 

 pedibus(jue rufis, posterioribus piceis ; elytris densius' subtiliusque reticulatis, et 

 (prsesertim versus apicem) subtilius punctulatis. Long. 8, lat. 4f 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 rather long, and their lower edge is a little emarginate near the base so 

 as to render the outline sinuous ; the ajiical ventral segment is very deeply and 

 coarsely rugose. Though very closely allied to Dytiscus chalconotus (No. 739), 

 this is an undoubtedly distinct species; the sculpture of the upper surface is finer 

 and denser, and the fine punctures placed on the meshes or reticulations of the 

 elytra are more distinguishable. It is still more closely allied to Agabus altaicus. 



