THE LEAP BEETLES. 



1115 



the curious habit of enclosing themselves in compact cases, com- 

 posed of their own excrement, which they mould into shape by 

 means of their mandibles. They carry their cases about with them 

 by protruding the .front part <>!' their bodies through the open ex- 

 tremity. (Fig. 4S2, 1). ) When about to transform they attach 

 their cases to the twigs, and close the opening, thus making them 

 answer the purpose of a cocoon. 



Two genera compose the tribe. The latest paper treating of 

 them is by 



Lin ell, Martin L. "New Species of Coleoptera of the Family 

 Chrysomelidae with a Short Review of the Tribe Chlamy- 

 dini," in Proc. V. S. Nat. Mus., XX, 1897, 473-485. 



KEY TO GENERA OF CHLAMYDINI. 



a. AntenntP serrate from tlie fourth or fifth joint. 

 aa. Antennae serrate from the sixth joint. 



XI. CHLAMYS. 

 XII. EXEMA. 



XI. CTILAMYS Knoeh. 1801. (NL., "A cloak or mantle.") 

 Two species probably occur in the State. 



KEY TO INDIANA SPECIES OF CHLAMYS. 



<i. Elytral intervals not or nbsoletely punctate; length 4 mm. 



2055. PLICATA. 

 mi. Klytral intervals closely and deeply punctate; length not over 3 mm. 



CRIBRIPENNIS. 



2054 (GG01). CHLAMYS PLICATA Fab., Ent. Syst. 



Snpp., 1798, 111. 

 Short, robust, oblong-quadrate. Brown, 



bronzed; elytra and legs sometimes blackish. 



Thorax with surface finely and densely strigose; 



disk with a large central tubercle which is 

 sparsely and coarsely punctured in front and bifid at 

 summit. Elytra each with 12 to 15 tubercles, the four 

 largest of which are arranged in an oblique row ex- 

 tending from humerus to suture; intervals between 

 the tubercles sparsely punctate, either flat or covered 

 with smaller tubercles. Length 4 rum. (Fig. 482.) 



Throughout the State, frequent; more so in 



Fig. 482. , hiva: //, samo the sou them counties. May 16-September '2'2. 



with body protruding from /-\ n n- a I-T n,i 



case; c, beetle. (Aftw Mm-- Occurs on foliage of various kinds, usually that 



of roadside w r eeds. 



(. crihrijH niiix Lei-., length 3 mm., was described from Detroit, 

 Michigan, and may occur in northern Indiana. 



