rc6 



[Prolmbly synonymous with D. episcopalis Lac. Taken on shore of 

 l^ke Superior.] 



305. DoNACiA CUPR.KA Kit by. — Length of body 4ji Hnes. Taken 

 in Canada by Dr. Bigsby [also on lake Superior.] 



[226.] Body above copper-coloured, glossy ; underneath covered 

 with a thick coat of decumbent pile of a cinereous colour, glittering in 

 certain lights. Head downy, channelled : mouth and palpi rufous ; man- 

 dibles and antennae black ; prothorax rather wider than long, very 

 minutely, thickly and confluently punctured and wrinkled ; channelled, 

 with a pair of impressions on each side, anterior tubercles not prominent ; 

 scutellum downy ; elytra very grossly punctured in rows ; a single anterior 

 impression near the suture ; truncated at the apex ; three intermediate 

 ventral segments of the abdomen have a yellow margin ; legs obscurely 

 rufous ; thighs bronzed in the middle ; posterior thighs with a minute 

 tooth near the apex. 



306. DoNAciA HiRTicon-is Kirby. — Length of body 3 J i- lines. A 

 single specimen taken in I^t. 65". 



Body underneath covered with a thick coat of decumbent pile 

 resembling satin and shining like silver. Head hoary from inconspicuous 

 hairs, most minutely and confluently punctured with a slight interocular 

 channel with an obtuse ridge on each side ; antennae with the second and 

 third joints equal in length ; labrum glittering with silver pile ; prothorax 

 longer than wide, hoary from inconspicuous down, most minutely and 

 confluently punctured, channelled, sides su bun pressed, anterior tubercles 

 flat ; scutellum large, levigated ; elytra black, punctured in rows, whose 

 interstices are wrinkled ; posterior thighs with a single short obtusangular 

 tooth. 



This pretty species comes near D. ^/di'/w Oliv., which I always find on 

 Potamogeton natafu, but it is sufficiently distinguished by its black thoraji 

 hoary from down, and legs without any red. 



[Synonymous with D. riuikoUis Lac. Taken on Lake Superior.] 



307. J^ONACiA .*;guAL!S Say. — Length of body 4-4)2 lines. Many 

 taken in the journey from New York to Cumberland-house [also in On- 

 tario.] 



[227.] Body underneath covered with a thick coat of silver pile as in 

 the preceding species. Head bronzed, hoary from cinereous down, 

 minutely and confluently punctured, channelled between the eyes with a. 



