82 PROCEEDINGS OF THE ACADEMY OF 



Specimens from Florida in Dr. Horn's collection are dull-l)lack, 

 those from Georgia {sneous, and two from New Mexico greenish- 

 blue; but I can see no other differences. 



10. 0. Ariadne (Newm.), Ent., i. 77, Baly 1. c. 



Black, thorax red, front and hind margins black ; thorax coarse- 

 ly punctate. L. .175. S. Carolina (Zimmerman). 



11. 0. Lecontii (Baly), 1. c. 



Yery like 0. Ariadne in color, but larger ; thorax transverse, 

 form less cylindrical ; thorax with the base transversely sulcate ; 

 disk with a raised vitta. L. .2^ lin. Unknown to me. 



These three species form the genus Chai'idena of Baly. 



MiCRORHOPALA, Chcv. 



Elytra 8-striate, alternate interstices costate. 

 Above more or less marked with red. 



Punctures of the elj^tra lightly impressed, second costa and often 



the thorax red, vittata. 

 Punctures deep and regular, second costa red. 



Under side black. Xerene. 



Under side steel-blue. rubrolineata. 

 Above unicolorous. 



Punctures regular. cyanea. 



Punctures very coarse, subcontinent. excacata. 



Elytra 10-striate in the apical part, black. porcata. 



Elytra regularly 10-striate, pale above. Melsheimeri. 



Elytra irregularly plicate and tuberculate. plicaiula. 



1. M. vittata (Fabr.), Syst. El., ii. 64. 



Bluisli-black, somewhat ovate; elytra faintly costate, punctures 

 lightly impressed, second costa more or less red. L. .23. Middle 

 and Western States, Oregon. 



Var. laetula, Lee, thorax red ; elytral costa clearly red. 



2. M. Xerene (Newm.), Ent. Mag., v. 390. 



Black, sides of thorax, second elytral costa and apex of first 

 red ; punctures of the stride deep and regular ; costa but little 

 elevated. L. .16-.n. Middle and Soutliern States. 



Var. interrupta^ Coup. Can. Nat. (2), ii. 63, second costa in- 

 terrupted by red. 



3. M, rubrolineata (Mannh.), Boitrng. p. 307. 



Tliis seems to me to ditfer only in having the under side blue. 

 California. 



Var. sifjnaticollia, Lee, Elj-tra unicolorous. 



