426 Pomona College Journal of Entomology 



I. Body brownish red to orange. Thorax quite strongly arched; 



notal pubescence very inconspicuous. T. frontalis Crawf. 



II. Body dark reddish brown. Thorax less strongly arched; notal 



pubescence slightly more conspicuous. 



T. frontalis sulcata Crawf. 



GG. Radius quite long, not straight, curved more or less in distal 



half. Cubcosta distinctly shorter than margin of radial cell. 



H. Head, facial cones, and notum whitish ; vertex bulging, with a 



short sulcate impression midway on each side of median suture. 



Female genital segment short ; anal valve of male spatulate. 



T. albifrons Crawl. 

 HH. Head, facial cones and notum not whitish, vertex usually more 

 extensively impressed. 



I. Facial cones scarcely divergent ; head usually black. 



J. Facial cones almost straight on inner margin, scarcely divergent 

 throughout; cone into eye 1. T. salicis Mally. 



JJ. Facial cones conical, but slightly divergent, not straight on 

 inner margin as above. Cone into eye X]/^. 



T. nigrifrons Crawf. 



II. Facial cones distinctly divergent, conical. Cone into eye 1 or less. 



Head usually orange colored. 

 J. Vertex conspicuously bulging over insertion of antennae. Facial 

 cones moderately long, and quite stout and divergent. Fe- 

 male genital segment moderately long ; anal valve of male 

 ovoid. T. assimilis Crawf. 



JJ. Vertex not conspicuously bulging over insertion of antennae. 

 K. Wings slightly fulvous, not entirely clear. \'ertex not deeply 

 impressed. 

 L. Wings quite conspicuously fulvous; somewhat rounded at 

 ape.x. Prcepisternum short and relatively broad. Vertex 

 between eyes four times the width of eye. Anal valve of 

 male small, simple. T. fulvida Crawf. 



LL. Wings inconspicuously fulvous ; rather subacute at apex. 

 Prcepisternum long and relatively slender. Vertex three 

 limes width of eye. .'\nal valve large, with a posterior lobe. 



7". aurantiaca Crawf. 

 KK. Wings not fulvous, perfectly clear. 

 L. \'ertcx with a marked sulcate impression on each side of 

 median suture. Facial cones slender, very divergent. Fe- 

 male genital segment moderately long. 

 M. Abdomen white ventrad. Facial cones very slender. 



T. siinilis Crawf. 



MM. Abdomen imicolored, ventrad and dor.sad. Facial cones 



not so slender. T. similis fovcalis Crawf. 



