424 Pomona College: Journal of Entomology 



BB. Both cubital veins and radius bordered with dark bands; marginal 

 cells darkened ; radius long, flexed midway ; first and third furcals 

 subequal ; female genital segment quite long ; anal valve of male ob- 

 triangular, with large posterior lobe. 



T. tripunctata (Fitch) Riley. 



BBB. Hind margin darkened from tip of clavus to apex of wing and through 



both marginal cells ; radius straight, rather short ; female genital 



segment short ; anal valve small, with a rectangular posterior lobe. 



T. imirginata Crawf. 

 AA. Forewings without stripes or bands, hyaline or slightly fulvous. 

 B. Setae on veins of forewing conspicuous ; membrane of wing with 

 punctural dots. Facial cones large. Female genital segment long. 

 .-Xnal valve large, arcuately lobate posteriorly. 

 C. Body large; wings quite fulvous; setae on veins prominent. 



T. mexicana Crawf. 

 CC. Body rather small ; wings but slightly fulvous ; seta not prominent. 



T. mexicana minnta Crawf. 

 BB. Setae on veins of forewings very inconspicuous or wanting; wing 

 membrane with few or no punctural dots. 

 C. Dorsum and verte.x conspicuously pubescent. 

 D. Pubescence long, quite dense. Vertex bulging ; facial cones very 

 short ; pronotum short. Wings large ; second marginal cell un- 

 usually large. Female genital segment moderately long ; anal valve 

 of male almost as large as ventral plate and similar in shape, with 

 a dorsal epiphysis. T. diosf>yri Ashmead. 



DD. Pubescence not long, somewhat pulverulent. \'ertex flat; facial 

 cones moderately long ; pronotum quite long. Wings not large ; 

 marginal cells subequal. Female genital segment rather long; anal 

 valve of male small. T. bakcri Crawf. 



CC. Dorsum and verte.x not pubescent, or if so, very inconspicuously. 

 D. Facial cones very short and broadly rounded apically, quite vertical. 

 Female genital segment exceedingly long and acute. Pronotum quite 

 long. 

 E. Epimeron long, visibly as long as episternum. Cone into eye more 

 than twice ; labrum very large. ( knital segment nearly one-fourth 

 as long as rest of body. 7". longistylus Crawf. 



EE. Epimeron concealed partially, visibly not as long as episternum. 

 Cone into eye scarcely more than twice ; labrum not large. 

 F. Epimeron visibly half as long as episternum. Style-like process 

 of female genital segment about as long as basal portion. 



'/'. coUaris Crawf. 



FF. Epimeron visibly only about one-fourtli as long as episternvim. 



Facial cones extremely short. Style of female fully twice as 



long as basal portion of genital segment. '/'. proximata Crawf. 



