On Aquatic Carnivorous Coleoptera or Dytiscidce. 523 



series of small palettes, the claws of the front feet are elougate and nearly straight ; 

 the female has the upper surface less shining than the male, and the meshes of the 

 reticulation smaller. 



North America. (Lake Superior, Pennsylvania). 793. 



730. Agabus obsoletus, Lec.(?), M.C. — Ovalis, minus convexus, niger, elytris 

 fu&co-nigris, ad humeros plusminusve indistincte rufescentibus, prothoracis lateribus 

 vix ferrugineis, antennis pedibusque rufis, his plus minusve picescentibus. Long. 8, 

 lat. 42 m.m. 



Mas, nitidus, fere laevigatus, densissime obsoletissimeque reticulatus. 



Fern., elytris subopacis, densius sat profundeque reticulatis, ad apicem leevigatis, 

 reticulis fere parvis. 



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

 and furnished beneath with rather large palettes, about thirty in number on each 

 foot, the basal palettes seem seated directly on the tarsus while the outer ones are 

 borne on hairs ; the claws on the front feet are elongate and slender, and sinuate 

 beneath. 



The female of this species much resembles that of Agabus reticulatus, but has 

 the meshes of the reticulation on the elytra smaller, and the apex quite without 

 scratches. 



Western North America. 796. 



731. Agabus {(iaurodytes) lecontei. Crotch, Tr. Am. Ent. Soc. IV, p. 417. — 

 Ovalis, minus convexus, niger, capite thoraceque seneis, subtiliter (in femina magis 

 conspicue) reticulatis, elytris fusco-rufis, antennis pedibusque rufis, his plus minusve 

 picescentibus. Long. 7f, lat. 4i m.m. 



Mas, elytris nitidis, fere omnino Isevigatis. 



Fern., elytris subopacis, dense profundeque reticulatis, reticulis circa scutellum 

 angustis et elongatis, parte apicali fere omnino laevigata. 



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 

 short, and the anterior one is furnished near the apex with a long slender lobe. 



The species differs from A. obsoletus by the outline of the thorax and elytra 

 being more continuous, as well as by other characters which will be observed from 

 the above diagnosis. 



Some individuals have the elytra testaceous, with infuscate nebulosities, and 

 probably will prove a distinct species, but as I have seen only males, and these are 

 very similar in their tarsi &c. to the darker form, I do not think it can be properly 

 considered distinct at present. 



Western North America. 797. 



TBAHS. BOT, DUB. SOC, H.S , VOL. II. S T 



