46 PROCEEDINGS OF THE ACADEMY OP 



CHRTSOMELIDES. 



Anterior coxal cavities closed, metasternum very short. Timarcha. 



Anterior coxal cavities open. 



Post, epi sterna elongate triangular, metasternum with a post coxal line 

 following the margin. 

 Claws simple. 



Thorax margined at base. 



Tarsi with the 3d joint entire. Chrysomela. 



Tarsi with the 3d joint emarginate or bilobed. 



Gastrophyna. 

 Thorax immarginate. 



Prosternum produced behind. Prasocuris. 



Tibiae excavated at the apex. Entomoscelii. 



Claws dentate. 



Tibiffi produced at apex. Oonioctena. 



Tibiae simple, 3d joint of tarsi bifid. Phyllodecta. 



Post, episterna parallel, post coxal line oblique, cutting off the external 

 angle of the metasternum. Plagiodera. 



1. Timarcha, Meg. 



1. T intricata, HaUl. Proc. Phil., vi. 363. (1854.) 

 T. intertexta^ Hald. is only a variety. 



2. T. cerdo, Stal., 1. c, p. 8, 2. 



Western America (Deyrolle.) Differs by being smaller, nar- 

 rower, and with a bronzed color; the thorax also appears to be 

 equally punctate. 



This subfamily has been carefully studied first b^' Mr. Rogers 

 in the Proceedings of the Academy for 1856, p. 29, and lately by 

 C. Still in a quarto extract from the Transactions of the Swedisli 

 Academy. Mr. Rogers' paper was also translated and revised by 

 Suffrian (Stett. Ent. Zeit. xix., p. 237, 1858). Hence I have 

 merelj' given tables of the species with remarks where necessary. 



2. Chrysomela. 



Last joint of palpi small, trnnrate. 



^Mcsoslernum produced in front. Lahidomera. 



Mesosternum simple. Myocoryna. 



Last joint of palpi dilated. 



Claws aiiprnxiiiiate. daw joint dentate beneath. Zygogramma. 



Claws distant, claw joint simple. 



Thorax not margined. Calltgrapha. 



Thorax thickly margined. Chrysomela. 



