64 PROCEEDINGS OF THE ACADEMY OP 



DisoNYCHA, Chev. 



Elytra yellow with black vittoe. 

 Under surface pubescent. 



Thorax short, sides broadly reflexed with a marked callus, head 

 black. 

 Legs and under side black. liinbicollis. 



Hind femora at least and part of the body red. V. paUqjes. 

 Thorax convex, subequal, with four black spots or immaculate ; 

 epipleurse with the outer edge pale. 



Metasternum black, a narrow mesial line smooth, alternata. 

 Metasternum red, the mesial surface broadly smooth. 



punctigera, 

 Epipleurfe black. 



Legs and under side black ; elj'tra subcostate. pennsylvanica. 

 Legs and under side red ; elytra very smooth, shining. 



glahrata. 

 Under side glabrous. 



Epipleurfe, legs, and under side black, thorax coarsely punctate. 



maritima. 

 Under side red. 



Elytra with the suture and a dorsal vitta black. abhrevita. 

 Elytra with a common broad sutural vitta black, discoidea. 

 Elytra blue or green. 



Thorax concolorous, surface opaque, apex of venter yellow, funerea. 

 Thorax yellow. 



Head, le^s, and under side black, head coarsely punctate. 



(j'iangularis. 

 Head and under side varied with red, front of head smooth. 



collar is. 



The species of this group var^' to an inordinate degree, and 

 the determination of true specific limits is one of extreme diffi- 

 culty. No certain result can be arrived at until long series have 

 been collected from different parts and the plants on Avhich they 

 feed carefully noted. This table is only intended as an approxi- 

 mation. 



Graptodera, Chevr. 



The species of this genus, from their similarity of coloration, 

 are even more embarrassing than those of the last genus ; numer- 

 ous species have been described, but at different times, so that 

 the characters are not contrasted; and the true specific limits 

 can only be ascertained when wc shall have seen series consisting 

 of a dozen of each qnasi-species from all parts of the country. 



