1864.] 



421 



Hickory-feeduig % . 

 1. Antennae, when relaxed and laid 

 <!loseand straightalong the back, reach- 

 ing beyond the tip of the elytra by the 

 whole length of the terminal joint (11.) 



2. Antennre from \ more robust to 

 twice as robust, especially towards the 

 base. 



3. Terminal or 11th joint of antennae 

 full i longer than the penultimate, and 

 composed of two portions connected by 

 an indistinct connate suture foreshad- 

 owing a 12th joint, (as in Purpuricenus 

 % and in Tragidion annulatum % Lee.,) 

 which suture is more distinct on the 

 inferior surface. The basal portion of 

 11th joint as long as joint 10, the ter- 

 minal portion, which is suddenly slen- 

 derer from base to tip. more than J as 

 long as joint 10.* 



4. Elytra widened at base and ta- 

 pered towards their tip, so that the two 

 together just before the extreme tip 

 equal the basal width of one of them.* 



5. The 2nd or W-shaped band on the 

 elytra in two of the Philadelphia spe- 

 cimens and the Illinois specimen whit- 

 ish, in the other Philadelphia specimen 

 centrally whitish but decidedly varied 

 with yellow on the two exterior arms 

 of the W.t 



6. Legs proportionally ^ — .\ longer 

 and stouter than in 9 • 



Locust-feeding % . 



1. Antennae, when relaxed and laid 

 close and straight along the back, even 

 in the specimen which has the longest 

 ones, not attaining the tip of the elytra 

 by a space equal in length to the two 

 terminal joints (10 and 11.) 



2. Antennae much less robust, except 

 the few last joints, and less tapered 

 from base to tip. 



3. Terminal or 11th joint of antennae 

 scarcely i or i longer than the penulti- 

 mate, the division into two portions 

 barely discoverable, and the terminal 

 portion not suddenly slenderer from 

 base to tip. 



4. Elytra much less tapered and 

 shaped exactly as in the 9 of both the 

 two races, i. e. with the lateral edges 

 subparallel. 



5. The W-shaped band on the elytra 

 colored yellow, exactly like the other 

 bands, in all my 15 specimens. 



6. Legs proportionally no longer or 

 stouter than in 9 • 



It is a suggestive fact, that although the % antennae differ so re- 

 markably in the two races both in length, robustness and structure, 



••■■ I am indebted to Mr. Bland for directing my attention to these two cha- 

 racters. 



I Dr. Fitch says that it was reported to hiiu that individuals reared in the 

 black walnut had the yellow bands on the body more or less white. (N. Y. Rep. 

 II. ^."529. "With the exception noted in the text they are all bright yellow in the 

 '^ % bred from the hickory. Mr. Bland remarks that this whiteness of the bands 

 is the exception and not the rule, as it only occurs occasionally at Philadelphia. 



