THE LEAF BEETLES. 1141 



XXIV. CHRYSOCIIUS Chev. 1S34. (Gr., "goldsmith.") 



This genus is represented in the eastern Ignited States by a 

 single large polished green species which lives upon the foliage of 

 milkweed (Ascl< />i<is). 



2110 (11741). CHRYSOCHUS AUKATUS Fab., Ent. Syst., 177.".. 101. 



Oblong, convex, Green, brilliantly polished; elytra often \vitb a cop- 

 l>ery or brassy tinge; antenna 1 , legs and under surface bluish-black. Head 

 and thorax with coarse, very sparse, deep punctures intermingled with 

 minute ones. Elytra finely and irregularly punctate. Length S-1 1 nun. 



Throughout the State; common. June 11-August 10. Occurs 

 on dogbane or Indian hemp (AjHx'ijinini) as well as milkweed. 



XXV. TYMNES Chap. 1874. 



Here belong three medium-sized oblong forms, two of which have 

 been taken in Indiana, while the other, i'i<>lac< us, perhaps occurs, 

 having been described from Pennsylvania. The key is that of Dr. 

 Horn. 



KICV TO SPECIES OF TYMNKS. 



(i. Sides of inetasternuin comparatively smooth. 



I). Color variable, green, bronze or cupreous; elytra coarsely punctate 



even to the apex; apical angle acute, very slightly prolonged in the 



male. 2111. TRICOLOR. 



hit. Color deep blue with violaceous reflections; elytra not coarsely and 



rather sparsely punctate, at apex quite smooth ; apical angle not 



acute. vior.ACEUS. 



an. Sides of metasternum densely and coarsely punctured; color piceous. 



slightly bronzed; elytra moderately coarsely punctured even to the 



apex; sutural angle well defined, not acute. 2111.'. MKTASTKRNAI is. 



LM11 (G744). TYMNES TRICOLOR Fab.. Ent. Syst., I. 177.",. :;ir,. 



Oblong, convex, subparallel. Bronzed or greenish, shining: brown be- 

 neath; antemne and legs pale reddish-brown. Thorax rather closely and 

 finely punctured on sides, nearly smooth on middle and toward base. Ely- 

 tra irregularly and rather coarsely punctate. Male with last ventral seg- 

 ment broadly einarginate and with a transverse depression. Length 6- 

 7. r > mm. 



Throughout the State; frequent. -I line 1 .July 21. Taken by 

 beating Ir-ixel, oak, wild grape and irmiwced. 



T. i iolaci ux Horn, was described from Allegheny. Pennsylvania. 



2112 (6745). TYMNES METASTERXALIS Crotch.. Proc. Phil. Acad. Nat. Sci.. 



1X7.",. .",S. 



Form and color of the preceding, but shorter and less shining. Head 

 and thorax more closely and evenly punctured. Elytra somewhat more 

 sparsely punctured and with traces of cost;e. Length .">-<; mm. 



