Pomona College Journal of Entomology 427 



LL. Vertex without marked silicate impression ; usually with 

 a shallow impression. Facial cones not very slender, quite 

 divergent. 

 M. Wings somewhat rounded at apex. Cone into eye less than 

 1. Anal valve of male small and simple. 



T. fulvida sitnilis Crawf. 

 MM. Wings subacute at apex. Cone into eye fully 1. Anal 

 valve of male quite long with a posterior epiphysis. 



T. nigra Crawf. 



Synopsis of the Genus Trioza Based Principally on the Genitalia 



.\. Female genital segment very short, scarcely longer than preceding ventral 

 sclerite. 

 B. Dorsal plate of female genitalia rhomboidal, not arched between apex 

 and genital pore, nor on ventral surface. Wings very broadly rounded. 

 C. Ventral plate of female triangular ; without epiphysis at apex. Fourth 

 furcal less than one-fourth as long as second cubital ; radius long. 

 Facial cones subvertical, long. T. longicornis Crawf. 



CC. Ventral plate of female rounded, with an acute epiphysis at apex. 

 Fourth furcal about one-half as long as second cubital ; radius rather 

 short. 

 D. Anal valve of male simple, converging toward apex, somewhat knobbed 

 at tip. Facial cones almost horizontal, long. 



T. rotundipennis Crawf. 

 DD. Anal valve of male not simple, with a moderately large posterior 

 lobe. Facial cones subvertical, rather long. Head and thorax more 

 or less striped and banded. T. varians Crawf. 



BB. Dorsal plate of female not rhomboidal, rounded on both upper and 

 lower surfaces. Wings not very broadly rounded. 

 C. Forewing with black or brown band. Radius straight, rather short. 

 .'Vnal valve of male with a posterior lobe. 

 D. Subcosta bordered with conspicuous black band for entire length. 



T. californica Crawf. 

 DD. Subcosta normal ; hind margin with brown band from tip of clavus 

 to apex of wing and through both marginal cells. 



T. marginata Crawf. 

 CC. Forewings without bands or stripes. Radius usually curved. 

 D. Facial cones scarcely divergent, rather short. 

 E. Facial cones almost straight on inner margin, not conical. 

 F. Body small ; wings very small. Dorsal plate of female very obtuse 

 at apex. 

 G. Facial cones scarcely divergent, quite straight on inner margin. 



T. >ninuta Crawf. 



GG. Facial cones slightly divergent in apical half. Body slightly 



larger. T. minuta similis Crawf. 



