Jassidcn of IJUuois. 27 



Abdomen. Above l)la(k, with white hiteral margins; 

 beneath yellowish green. 



A very common and extremely variable species. The two 

 following varieties are very noticeable: 



Var. 'V. 



This variety differs from T. hieroglyjyhica, in being almost 

 entirely slaty green, though possessing the same black 

 markings. The median band of the scutellum is a beautiful 

 bright yellow. The elytra have five black longitudinal lines. 

 Body yellowish green beneath. 



Var. /5. 



This variety is deep black in color, apparently due to the 

 blendings of the black lines in var. 'j-.; the specimens show a 

 tendency to an obliteration of the slate-green markings and 

 may become entirely black. The most persistent lines, which 

 may indicate something of the original marking of the group, 

 are a yellow line before the eyes, one on the cheeks nearest the 

 base of the clypeus, and one just beneath the antenna?. The 

 median band on the scutellum seems to become even brighter. 

 There are also lines on the claval sutures of the elytra. 



These remarkable varieties would probably have been 

 ranked as distinct species if connecting links were not often 

 taken. 



Subgenus III. 



Head very short, elytra apparently with an additional sector 

 and no anteapical cells. 



T. bifida Say. 



TctHgonia bifida Say, Journ. Acad. Phila., Vol. VI., p. 313, 5. 



Green; head and thorax transversely, and elytra longitud- 

 inally, lineate with black. 



Length 6 mm. 



Head. Above yellow, with a broad black band in which 

 are situated the ocelli, and a conspicuous black tip. Eyes 

 brown. Beneath black, with two small yellow spots, one on 

 either side of the tip of the front margin. Sides of the front 

 and tip of the clypeus, brown. The gulte are margined with 

 yellow, and the antenna? are yellow. 



