30 Illinois State Laboratory of Natural History. 



Elytra black, except the outer edge, which is whitish. 



G. ALBIIIARGINATA. 



Reddish all over the back G. bimaculata. 



The insects of this genus are remarkably uniform, but the 

 species are distinctly marked. 



Q. 8-lineata Say. 



G. 8-lineata Say. Jour. Acad. Phila., Vol. IV., p. 340. 



Green, with eight red or yellow lines on the thorax, which 

 continue on the head and scutelluni. Elytra with yellowish 

 veins. 



Length 10 mm. 



Head. Above green, with the continuation of the red- 

 dish lines as follows: a middle pair, close to the median furrow, 

 continuing nearly to the apex; the next pair represented only 

 by small yellowish spots; while the third follows along the 

 edge of the eye and the anterior margin of the head, the 

 outer pair not being present. Beneath, the color is lighter than 

 above, unicolorous, the front and clypeus not separated by a 

 distinct suture. 



Tliorax. Pronotum very narrowly margined, disk finely 

 striate, and with eight equal parallel reddish lines. Scutellum 

 green, anterior portion with six reddish lines continued from 

 the thorax, terminal portion transversely striate. Beneath, and 

 legs, light green. Elytra uniform green, apical and anteapical 

 cells irregular, numerous. 



Abdomen unicolorous green. 



The most common species of this genus. 



G. bipunctulata , n. sp. 



Green, unmarked, except by a black spot near the anterior 

 edge of the prothorax on either side. 



Length 10 mm. 



Head shorter, and with slightly blunter anterior margin 

 than in O. 8-lineata. Transverse striations visible on the front, 

 and the lore distinct. 



Tliorax with the {>ron(»tum faintly transversely striate, 

 with the usual scars, and also bipunctate with black. Scutel- 



