1180 



FAMILY LIII. — CHRYSOMELID.E, 



66. Mesosternum very short, nearly concealed by the close approach of 

 the pro- and meta sterna ; form orbicular or hemispherical ; antennas 

 slender, but slightly thickened externally ; color piceous black, shin- 

 m &- Spkleroderma. 



LI. (Edionychis Lat. 1829. (Gr., " swollen + joint. ") 



A large genus of oval, small or medium-sized species having the 

 head inserted in the thorax to the eyes ; thorax always much broader 

 than long, deeply emarginate in front, the margin more or less 

 dilated, base curved, usually obliquely sinuate near the hind angles; 

 elytra oval, humeri not prominent; presternum moderately wide 

 between the front coxa?, the cavities open behind; side pieces of 

 metathorax rather wide, parallel and roughly punctured ; legs short 

 and robust, front and middle tibiae slightly broader at apex, the 

 outer edge deeply grooved; hind femora very stout and thick, 

 deeply grooved beneath for the tibiae, which are short and feebly 

 grooved; tarsi with first joint oblong, triangular, second smaller and 

 narrower, last joint of hind pair globular; claws divaricate and 

 dilated at base. Males with the first joint of front tarsus more 

 broadly dilated and last ventral segment with a deep sinuation each 

 side, the space between forming an oval lobe with a finely impressed 

 line at middle. Eleven species have been taken in the State, while 

 two others may occur. 



KEY TO INDIANA SPECIES OF CEDIONYCHIS. 



a. Antennae stouter, scarcely half the length of body; species larger (4.5 

 or more mm.) and more convex; front of head oblique; elytral mar- 

 gins not flattened. 

 b. Elytra wholly of one color. 



c. Elytra brilliant bine or green; thorax smooth; body beneath en- 

 tirely pale. 21S0. gibbitarsa. 

 cc. Elytra dull bine or greenish-black ; thorax more or less punctate ; 

 body beneath in great part dark. 

 <1. Punctures of elytra distinct, often coarse and close; thorax bor- 

 dered with pale. 2181. vians. 

 chl. Punctures of elytra almost obsolete; thorax black. 



2182. CONCINNA. 



66. Elytra bicolored, either with a pale margin or with stripes on the 

 disk, rarely dull reddish-yellow, with the suture black. 

 e. Elytra bluish, the margin pale; thorax and elytra coarsely and 

 closely punctate. 2183. thoracica. 



ce. Elytra dull yellow, with or without black stripes. 



/. Elytra wholly dull yellow except a sutural black line. 



2184a. var. fimbriata. 



ff. Elytra yellow With dark stripes. 



