524 On Aquatic Carmvorous Coleoptera or Dytiscide. 
732. Agabus griseipennis, Lec., M.C.—Ovalis fere angustulus, minus convexus, 
niger, capite thoraceque eneis, hoc margine laterali ferrugineo, subtiliter (in femina 
magis conspicue) reticulatis, elytris testaceis, infuscatis (basi margineque externo 
exceptis) ; antennis pedibusque testaceis, femoribus ex parte nigris. Long. 8, lat. 
4¢ m.m. 
Mas, elytris nitidis, fere omnino leevigatis. 
Fem., elytris subopacis, dense profundiusque reticulatis ; parte apicali omnino 
leevigata. 
In the male the three basal joints of the front tarsi are greatly incrassate and 
but little compressed, and are furnished beneath 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. lecontel, 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 North 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 male has the front and middle tarsi much inerassate, and furnished beneath 
with large palettes ; the claws of the front 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 prosternal process of a different form. 
Northern Europe, and Siberia ; (Sweden ; Finland, to 69° North, Sahlberg). 800. 
734. Agabus obliteratus, Lec., M.C.—Ovalis, minus convexus, haud 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. 4¢ 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 
