70 THE CANADIAN ENTOMOLOGIST. 



DoNACiA, Fabr. 



Numerous Canadian species are known, which, from their general 

 uniformity of appearance, are often difficult to identify. Careful attention 

 to the points recently elaborated by Mr. Chas. W. Leng, and published 

 by him in a late paper on the genus, should result in correct names, 

 however. The following table is based on that of Mr. Leng, though I 

 have changed the arrangement somewhat, in order the sooner to eliminate 

 the more easily recognized species : — 



A. Head, thorax and elytra pubescent. .40-44 in., .pubicollis, Suffr. 

 A A. Head and thorax pubescent, elytra glabrous. 



.36-, 44 in hirticollis, Kirby. 



AAA. Head sometimes, thorax and elytra never, pubescent, 

 b. Elytra distinctly rounded at tip ; form convex, 

 c. Thorax depressed, no median nor basal line. 



.24-32 ! pusilla^ Say. 



cc. Thorax convex, basal line distinct, longitudinal one 

 usually so. 

 d. Legs dark ; body usually metallic blue. 



.24-28 in emarginata, Kirby. 



dd. Legs reddish-yellow. Body usually copper-bronzed. 

 Thorax thickly punctured. .28-36 xw.flavipes. Say. 

 Thorax sparsely punctured. .26-30 in...;7^/<:?, Say. 

 bb. Elytra truncate or subtruncate at tip. 



e. Middle coxae separated by about their own width ; body 

 broad, distinctly flattened above. 



f. Second and third joints of antennae nearly equal. 



.28-44 in cincticorfiis, Newm. 



ff Third joint of antennae much longer than second. 



Elytra truncate at tip. First ventral S simple. 



.36-.44 in . . . pai/iiata, Oliv. 



Elytra subtruncate at tip. First ventral $ with a 



pit at middle. .26-.40 in piscatrix, Lac. 



ee. Middle coxse separated by less than their own width. 

 Body usually convex above, narrower than in preced- 

 ing group. 



g. Prothorax scarcely tuberculate at sides, surface with 



coarse uniform punctures. 



.2S-,44 in subtilis, Kunze. 



