THE LEAP BEETLES. 



1141 



XXIY. Chrysochus Chev. 1834. (Or., " goldsmith.") 



This genus is represented in the eastern United States by a 

 single large polished green species which lives upon the foliage of 

 milkweed (Asclepias). 



2110 (6741). Chrysochus aubatus Fab., Ent. Syst, 1775, 101. 



Oblong, convex. Green, brilliantly polished; elytra often with a cop- 

 pery or brassy tinge ; antennae, 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 8-11 nun. 



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



on dogbane or Indian hemp (Apocynum) 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, violaceus, perhaps occurs, 

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

 Horn. 



KEY TO SPECIES OF TYMNES. 



a. Sides of metasternum comparatively smooth. 



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

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

 male. 2111. tricolor. 



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

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

 acute. violaceus. 

 aa. 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. 2112. metasternalls. 



2111 (6744). Tymnes tricolor Fab., Ent. Syst., I, 1775. 316. 



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

 neath; antennae 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 emarginate and with a transverse depression. Length 6- 

 7.5 mm. 



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

 beating hazel, oak, wild grape and ironweed. 



T. violaceus Horn, was described from Allegheny, Pennsylvania, 



2112 (6745). Tymnes metasternalls Crotch., Proc. Phil. Acad. Nat. Sci.. 



1S73, 38. 



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 costae. Length 5-6 mm. 



