THE CANADIAN ENTOMOLOGIST. 



71 



gg. Prothorax tuberculate at sides, disk uneven. 



Sutural margin of elytra not sinuate, disk with two 



transverse indentations. .22-.28 m..aeqimns,?>3iy. 



Sutural margin of elytra sinuate near the tip. 



.28-36 in distitida, Lee. 



It will be noted that several of the names on the Canadian list do 

 not appear in the above table. These have been reduced to synonymy 

 by Mr. Leng, as follows : D. cuprea becomes pusilla, D. rtigifrons 

 gives way to emargitiata, D. jiicunda to flavipes, and D. Kirbyi to 7ufa. 



Both proxima and magnifica are considered by him 

 to rank only as varieties of cindicornis, proxima 

 having the prothorax punctate only at base and apex, 

 while in magnifica it is coarsely punctured over the 

 whole surface. He reduces (with an expression of 

 doubt) torosa to a varietal form of distincta, from 

 which it differs by Dr. Leconte's description in being 

 of a blackish-violet colour and in having the pro- 

 thorax somewhat elongate, while the same author 

 describes his distinda as coppery, with the thorax 

 quadrate. It is a matter of remark that Mr. Crotch 

 should have placed these forms in different and 

 apparently well-founded divisions in his synopsis, while Mr. Leng thinks 

 them only varietal. Fig. 4 shows the form of body common in the 



genus. 



H^MONiA, Latr. 



The only North American species is H. nigricornis, Kirby, which 

 resembles a small Donacia in form. Beneath, the body is blackish, the 

 upper surface and the legs are reddish-yellow. The head, antennae and 

 tarsi are dark. The elytra are marked with ten long rows of punctures 

 and a shorter one near the suture at base. Length, .20-.28 in. It is 

 said to occur on Potamogeton. 



Tribe II. — Sagrini. 



The few species comprised in this group are remarkable for the 

 plasticity of their characters and the difficulty of accurately defining their 

 limits of variation. They are of small or moderate size and agree in 

 having strongly punctured elytra, which are wider than the thorax. The 

 mouth is rather prominent, the eyes very convex, giving the head a width 



Fig. 4. 



