Pomona College Journal of Entomology 425 



DD. Facial cones not very short, at least moderately acute apically. 

 Female genital segment not extremely long and acute. I'runotum 

 usually rather short. 



E. Wings very broadly rounded apically, without any angulation what- 

 ever (7'. longicornis is typical of a rounded wing; T. simitis and 

 T. albifroiis 1 consider slightly angulated) ; furcation of second 

 cubital on or behind long axis of wing from base of subcosta to 

 apex of wing. Facial cones long, divergent. 

 F. Thorax and vertex quite conspicuously striped and banded with 

 yellowish white on dark ground color. T. varians Crawf. 



FF. Thorax and vertex not striped or banded. 

 G. Facial cones quite horizontal, easily visible from above. Radius 

 short, straight; fourth furcal one-half as long as second cubital. 



7\ rotundipcnnis Crawf. 

 GG. Facial cones subvertical, only slightly visible from above. Radius 

 long, curved ; fourth furcal less than one-third as long as second 

 cubital. T. longicornis Crawf. 



EE. Wings not very broadly rounded, as above; more or less angulated 

 or acute apically ; furcation of second cubital usually in front of the 

 long axis of wing. Facial cones not very long. 

 F. Length of forewing distinctly less than 3 mm. Body very small. 

 Facial cones short, subacute. 

 G. Genital segment of female long, with a short, slender ovipositor 

 sheath. Labrum small. Prcepimeron mostly concealed, visibly 

 only half as long as episternum ; forecoxse mostly visible. 



T. nicaraguensis Crawf. 



GG. Genital segment of female very short ; dorsal plate very obtuse. 



Labrum relatively large. Prcepimeron visibly as long as or 



longer than episternum ; forecoxse mostly concealed. 



H. Facial cones straight and quite parallel on inner margin, scarcely 



divergent. T. minnta Crawf. 



HH. Facial cones not entirely straight, somewhat divergent. Body 



slightly larger. T. ininiita si mil is Crawf. 



FF. Length of forewing fully 3 mm. or more. Body not unusually 



small. 



G. Radius short, straight, without a curve : subcosta nearly or fully 



as long as margin of radial cell. 



H. Hind margin of wing with four spots visible to unaided eye, 



one on margin of each marginal cell, one on cubital cell, and 



one on anal angle. Vertex glabrous. Prcepimeron mostly visible. 



T. quadripunctata Crawf. 

 HH. Hind margin without four easily visible spots; three usual 

 marginal spots present. Vertex slightly pubescent. Prcepi- 

 meron mostly concealed. 



