]180 PAMIIji' IjIII. CHEVSOMIOrjn.T?. 



?y!y. Mesosternum very short, nearly concealed by the i-lnsc approach of 

 the pro- and metaisterna ; liirm orbicular or heiulspherlcal ; antennip 

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



ing. 



Spii.bkoderma. 



LI. Oi^DiONYOHiS Lat. LS29. (Gr., "swollen -i- joint. ") 



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

 head inserted in the thorax to the ( yes ; thorax ahvays 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; prosternum moderately wide 

 between the front coxa', the cavities open l)eliind; side pieces of 

 metathorax rather wide, parallel and roughly punctured; legs short 

 and robust, front and middle lil)ia' .slightly broader at apex, the 

 outer edge deepl3' grooved ; hind f emoi'a very stout and thick, 

 deeply grooved beneath for the tibiae, ^\■hicll are short and fee1)ly 

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

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

 dilated at base. Mah>s with the first joint of front tarsus more 

 broadly dilated and last ventral segment with a deep sinuation each 

 sid(!, the space between forming an oval lohe with a finely impressed 

 line at middle. Eleven S]i(cies have been taken in the State, while 

 two others may occur. 



KEY TO INDIANA SrKCHOS OF CEniONYCITIS. 



a. Aiitennre stouter, scarcely half the length of bcidy; species lari^cr (4.5 

 nr more mm.) and more convex; front <if head oblique; elytral mar- 

 gins ncit flatteni'd. 

 h. Elytra wholly of one coldr. 



c. Elyti-a brilliant blue or green; thorax smooth; liody beneath en- 

 tirely ], ale. 21,so. ciiiinTAHSA. 

 cr. Elytra dull blue or green isli-black ; thorax more or less punctate;- 

 liody beneaih in great part dark. 

 (/. Punctures of elytra distinct, often c'oarse and close; thorax bor- 

 dered with pale. ^ISl. V,,\NS. 

 0(1. Punctures of elytra almost (ibs(il<ne; thorax black. 



-1X12. CONCINNA. 



'^?J. Elytra bicolorod, either witli a pah' margin .,r with strijies on the 

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

 c. Elytra bluish, the margin pale; thorax .'lud elytra ,-,iarseIv and 

 cidselv iiunctate. ■>i^-. „ 



• ' -Ms... THOKACICA. 



cc. lUytra dull yellow, with ov without black siripes. 



/. Elytra wholly dull yellow except a sutural black lini'. 



,, .^ ;;iS4a. var. n.MHRiAiA. 



ff- Elytra .vellow with dark stripes. 



