THE LAME LLI CORN BEETLES. 



951 



XIX. Dichelonycha Kirby. 1837. (Gr., "cleft + claw.") 



Elongate, parallel, siibdepressed species, usually piceous or 

 brownish-yellow in hue, with a distinct greenish, purplish or bronze 

 lustre. They are covered with a fine silky pubescence, have large, 

 prominent eyes, the first ventral segment in great part visible, the 

 claws cleft at tip. The males have the club of antenna nearly as 

 long as the remaining portion and the middle line of abdomen, when 

 viewed from the side, more or less concave. They often occur in 

 numbers on the young shoots or leaves of trees and shrubs. Five 

 species have been taken in Indiana, while another probably occurs. 



KEY TO INDIANA SPECIES OF DICHELONYCHA. 



a. Thorax without a well defined median groove. 



b. Prevailing color dull brownish-yellow, the elytra usually with faint 

 greenish or bronzed surface lustre ; tibiae and tarsi entirely pale. 

 c. Suture between clypeus and front indistinct, not impressed. 

 d. Subapical marginal grooves of thorax distinct; front margin of 

 clypeus narrowly reflexed ; elytra with a darker narrow stripe 

 on the sides which is more distinct at its extremities. 



1795. SUB VITTATA . 



del. Subapical and basal marginal grooves obsolete; clypeus rather 

 broadly reflexed ; elytra without trace of darker lateral stripe. 



TESTACEA. 



cc. Suture between clypeus and front distinct, rather deeply im- 

 pressed; clypeus rather strongly reflexed; subapical marginal 

 line of thorax deeply impressed; elytra pale, feebly tinged with 

 green. 1796. dilcta. 



1)1). Prevailing color dark; elytra in fully colored species more or less 

 brilliant green or bronze. 

 e. Suture between clypeus and front indistinct; surface lustre green- 

 ish or purplish ; apex of hind tibiae and tarsi piceous. 



1797. ELONGATA. 



cc. Suture between clypeus and front deeply impressed; elytra piceous 

 with bronzed lustre ; legs wholly reddish-brown or piceous. 



1798. FUSCULA. 



a a. Thorax with a rather broad and deeply impressed median line or 

 groove ; elytra with distinct greenish lustre. 1799. albicollis. 



1795 (5657). Dichelonycha slbvittata Lee, Journ. Phil. Acad. Nat. Sci., 

 Ill, 1856, 279. 



Resembles clmififtta in form but stouter. Dull reddish-brown or brown- 

 ish-yellow, with a bronze or greenish tinge; elytra with a fuscous or dark 

 greenish stripe on sides, often obsolete except on the humeral ami apical 

 elevations. Head coarsely and rugosely punctured. Thorax with a faint 

 median line; less densely and more- coarsely punctured than in elotigata, 

 its surface sparsely pubescent in both sexes. Elytra rather coarsely punc- 

 tured and wrinkled, very sparsely pubescent. Length 10-11.5 mm. 



