232 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



IIH. Posterior margin of vertex not narrowly 

 elevated over entire width, only over discal 

 areas of frontal plates ; frontal plates not 

 deeply depressed, usually light colored. 

 Trioza aurantiaca frontalis n. var. 



FF. Facial cones not strongly divergent, and not con- 

 tiguous. 



G. Wings with dark bands or stripes. 



H. Wings with a broad brownish band on 

 cubital margin from tip of wing to near 



base Trioca iiiaygiiiata n. sp. 



HH. Subcosta and anal angle with a black band 

 or stripe for entire length. Radius very 

 short Trioca califoniica n. sp. 



GG. Wings clear, without bands or stripes. Head 

 with eyes about as wide as thorax. 

 H. Wings moderately broad and not very 

 acute apically. Frontal plates scarcely de- 

 pressed. 



I. Facial cones rather straight on inner 



margin and almost contiguous ; frontal 

 plates scarcely notched at median su- 

 ture on anterior margin. Body usually 

 light colored Trioza salicis Mally. 



II. Facial cones distinctly conical, more 



diverging than in T. salicis. Frontal 

 plates quite deeply notched at median 

 suture. Body usually dark brown to 



black Trioaa nigra n. sp. 



HH. \\'ings slender and quite acute apically; 

 first furcal very short. Facial cones short, 

 slightly diverging, usually straight on in- 

 ner margin. Body small. 

 Trioza di inula n. sp. 



DD. Genital segment of female c|uite long, with or without an 

 exserted ovipositor blade. 

 E. Wings striped ; radius and first and second cubitals with 



a brown band on both sides ; third furcal much shorter 



than fourth furcal. Facial cones rather large and blunt 



at tips, moderately divergent. 



Trioza tripitiicta/a Filch 



I'lE. Wings witliout stripes; third and fnurlii furcals stdi- 

 equal. 



