﻿AMERICAN TRIOZIN/E I 231 



DD. Wings distinctly rounded apically. 



E. Wings clouded ; marginal cells unusually small ; first and 



third furcals very short, second and fourth longer. , 'j i 



Trioza tvipunctata (male) Fitch. '''' 



EE. Wings clear ; marginal cells normal. 



F. Frons and facial cones whitish. Radius about as 



long as second cubital Trioca albifrons n. sp. 



FF. Frons and facial cones not whitish. 



G. Radius about as long as second cubital ; second 

 cubital short ; first marginal cell larger than 

 second. Anal abdominal segment white, the yv/'-'-* / ;Mj 



rest dark Trioza rotundipcunis n. sp.^"' , 



GG. Radius much longer than second cubital : mar- 

 ginal cells subequal. Abdomen entirely light 



colored Tno::a siiiiilis n. sp. 



BB. Facial cones vertical, or nearly so, scarcely visible from aljove. 



■ C. Facial cones more or less divergent. Marginal cells subequal 

 and of medium size. 



D. Genital segment of female very short, without exsertcd ovi- 

 positor blade. 

 E. Wings slightly but distinctly fulvous, roundly pointed 

 apically; margin of clavus (anal angle) usually heavy 

 and black. Discal portions of vertex broadly depressed 

 on each side of median suture ; facial cones quite strong- 

 ly divergent. Abdomen usually greenish white ven- 



trally, darker dorsally Triosa fnlvida n. sp. 



EE. Wings not fulvous, distinctly transparent and shining. 

 F. Facial cones quite strongly divergent. 



G. Facial cones moderately acute at tips. 



H. Frontal plates yellow around margin and 

 along median suture ; facial cones long, 

 usually somewhat subvertical. 



Trioza varians n. sp. 



HH. Frontal plates not yellow as above. 



I. Frontal plates depressed as in T. fiil- 



vida ; cones quite vertical, mediiini in 

 length Trioca fnlvida simiUs n. var. 



II. Frontal plates with small fovea poste- 



riorly; cones subvertical, quite long. 



Triosa longicoriiis n. sp. 



GG. Facial cones not moderately acute, quite blunt 

 at tips. 



H. Posterior margin of vertex narrowly ele- 

 vated over entire width ; frontal plates 

 deeply depressed, often dark colored. Ra- 

 dius usually at least as long as second 

 cubital Trioza aiiraiitiara n. sp. 



