524 On Aquatic Carnivorous Coleoptera or Dijtiscidce. 



732. Agabus griseipennis, Lee, M.C. — Ovalis fere angustulus, minus convexus, 

 niger, capita thoraceque seneis, hoc margine laterali ferrugineo, subtiliter (in femina 

 magis conspicue) reticulatis, elytris testaceis, iufuscatis (basi margineque externo 

 exceptis) ; antennis pedibusque testaceis, femoribus ex parte nigris. Long. 8, lat. 

 44 m.m. 



Alas, elyti'is nitidis, fere omnino Itevigatis. 



Fetn., elytris subopacis, dense profundiusque reticulatis ; parte apicali omnino 

 laevigata. 



In the male the three basal joints of the front tarsi are greatly incrassate and 

 but little compressed, and are furnished lieneath with large palettes, the fourth 

 joint is unusually short, the claws are quite short, and the anterior one is thick, 

 with a slender termination : the intermediate tarsi have the four basal joints 

 much incrassate, and the three basal furnished beneath with large palettes, the 

 claws of the elongate fifth joint are unequal, the hinder or inner one being rather 

 the shorter, and incrassate with a slender, much curved, termination. 



Though this species much resembles the pale form of A. lecontei, it is distin- 

 guished by its narrower, more elongate form, and the slight but quite undoubted 

 differences in the structure of the male feet ; the reticulation of the upper surface 

 in the female is deeper than in A. lecontei. 



Western Xorth America, (Nevada). 798. 



733. Agabus {Gaurodytes) zetterstedti, Thoms., M.C. — Oblongo-ovalis, minus 

 convexus, subnitidus, niger, capite prothoraceque Eenescentibus, elytris fuscis, 

 lateribus dilutioribus, antennis pedibusque testaceis ; supra undique densius 

 reticulatus. Long. 9, lat. 5 m.m. 



The ma^e has the front and middle tarsi mvich incrassate, and furnished beneath 

 with large palettes ; the claws of the fi-ont feet are rather elongate and stout, and 

 but little curved, and slightly sinuate beneath ; the sculpture of the upper surface 

 is not so deep as in the female. The species has much superficial resemblance to 

 Dytiscus sturmi (No. 737), but is more elongate, and has the upper surface more 

 densely reticulate, and the prostemal process of a different form. 



Northern Europe, and Sibeiia ; (Sweden ; Finland, to 69° North, Sahlberg). 800. 



734. Agabus obliteratus, Lee, M.C. — Ovalis, minus convexus, baud latus, fere 

 leevigatus, pernitidus, niger, antennis pedibusque rufis, femoribus picescentibus ; 

 prothorace margine laterali anguste rufo, elytris fusco-testaceis, basi margineque 

 externo dilutioribus. Long. 8, lat. 4i m.m. 



The male has the three basal joints of the front and middle tarsi greatly incrassate, 

 and furnished beneath with rather large palettes ; the claws of the front feet are 



