86 CHEYSOMELID^E. 



Division CAMPTOSOMES. 



Key to the Subfamilies. 



A. Antennae short, the joints serrate. 



a. Thorax without grooves on flanks ; 



elytra not tuberculate. 



a. Last joint of maxillary palpi pointed, 

 posterior femora with one or two 

 teeth, claw-joint very long Megalopinat. 



b'. Last joint of maxillary palpi more 

 or less truncate, posterior femora 

 without teeth, claw-joint normal. . Clytrince. 



b. Thorax with grooves on flanks for 



reception of antennae ; elytra tuber- 

 culate Chlamyditwe. 



B. Antennae long and generally filiform, 



never serrate, sometimes shorter with 



terminal joints thickened Cryptocephalince. 



Subfamily I. MEGALOPIN^. 



Body elongate, often flattened above ; head frequently but not 

 always constricted behind the eyes, the latter of variable size, 

 deeply emarginate ; the terminal joint of the palpi elongate and 

 pointed ; antennae short, the terminal joints more or less trans- 

 versely widened, sometimes dentate, the basal joint inserted in 

 front of the eyes, close to the inner margin. Thorax transverse, 

 without lateral margins, often with an anterior and posterior 

 groove, occasionally tuberculiform at sides. Elytra irregularly 

 punctured and frequently pubescent, their epipleurae absent. 

 Prosternum very narrow or indistinct, the mesosternutn either 

 extremely narrow and linear or entirely hidden. The metasteruum 

 sometimes raised at each side into a high elevation often of conico- 

 truocate shape. The legs robust, with the posterior femora 

 strongly incrassate and often armed with a tooth in the male ; the 

 tarsi widened, pubescent, the claws very long and simple. 



This subfamily is more fully represented in South and Central 

 America than in the East whence only two genera and a small 

 number of species are known at present. These insects may 

 be distinguished from those belonging to any of the preceding 

 subfamilies by the short antennae, which have their terminal 

 joints more or less strongly transverse and serrate. In this 

 respect they resemble the Clytrince in which there is, however, 

 a distinct lateral thoracic margin which is absent in this. 



Key to the Genera of Megalopiuae. 



a. Thorax with anterior and posterior sulcus, 



sides without tooth TEMXASPIS, p. 87. 



b. Thorax with tooth near base at sides COLOBASPIS, p. 91. 



