90 ■ Annals Entomological Society of America [Vol. XIII, 



5. Gypona angulata Spangb. 



Gypona tenella Spgb.; Gypona germari Fowl, (not Stal). 



The angled vertex, together with the elongate form render 

 this a strikingly distinct species. Superficially it resembles the 

 paler forms of striata but lacks the reticulations. 



The writer has taken it quite freely on the loco weed {Oxy- 

 tropis lamhertii) in the foothills of the Rockies in Colorado and 

 has examples from British Columbia to Vera Cruz, Mexico. 

 This species was described from a male from Texas. Later 

 Spangberg described tenella from both sexes from Georgia. No 

 material has been seen that indicates that there are two species 

 in our fauna, and there is nothing in the original description 

 that would separate them. 



Gibson places dorsalis as a questionable synonym of this 

 species although it was described as twice as broad as angulata 

 with an entirely different head. 



Subgenus Prairiana no v. 



Resembling Gypona but with a much narrower and longer 

 front and small, widely separated eyes. Vertex flat, elongate 

 nearly equalling the pronotum, angulate, meeting front in a 

 thin, foliaceous margin, ocelli on the disc distinctly in front of 

 eyes. Front narrow and parallel margined in typical examples, 

 often twice longer than wide. Antennal sockets close to front. 

 Species pale gray to brown, entirely peppered with fine fuscous 

 points which margin the nervures of the elytra. Darker examples 

 may have linear markings in the areoles. 



Type of the subgenus Prairiana cinerea Uhl. 



The obscure and uniform coloration of this group is striking 

 and probably an adaptation to the color of the dead grass 

 blades around the margins of the clumps under which they live. 



Key to Subgenus Prairiana. 



A. Ocelli farther from eyes than from each other, elytral areoles with dark 

 margins, central markings faint or wanting. 

 B. Front narrow, almost parallel, twice as long as its antennal width, 

 vertex long, convex, irregular. Markings in areoles obscure or want- 

 ing, nervures margined with black punctures 1. cinerea \Jh\. 



BB. Front wider, less than twice as long as its width. Vertex shorter. 



Marking in areoles definite, especially in the male. . .2. miliaris Stal. 



AA. Ocelli farther from each other than eyes. Antennal sockets touching eyes. 



Elytral areoles heavily marked with irregular brown areas and faintly 



margined " 3. fraudulenta Spgb. 



