Pomona College Journal of Entomology 427 



LL. \'crtex without niarkcil silicate impression ; u>ualiy with 

 a shallow impression. Facial cones not very slender, quite 

 divergent. 

 M. \\ in^s somewhat njtiiided at ape.x. C(jne into eye less than 

 1. .\nal valve of male sniall and simple. 



7". fuh'ida similis l.'rawf. 

 .\l.\l. Wings subacute at apex. Cone into eye fully 1. .Anal 

 valve of male (|uite long with a posterior epiphysis. 



T. nigra Crawf. 



Synopsis of the Genus Trioza Based Principally on the Genitalia 



.\. Female genital >egmeiU very simrt. scarcely longer than preceding veiUral 

 scleritc. 

 r>. Dorsal plate ol female genitalia rimmhoidal. not arched between ajK'X 

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

 C. X'entral plate of female triangular; without ejjiphysis at apex. Fourth 

 ftircal less than one-fourth as long as second cubital : radius long. 

 Facial cones subvertical. long. T. longicortiis Crawf. 



CC. X'entral plate of female rounded, with an acute epiphysis at apex. 

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

 short. 

 D. .Vnal valve of male sim])le, converging toward a])ex. somewhat knobbed 

 at tip. Facial cones almost horizontal, long. 



T. rotundipcnnis Crawf. 

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

 lobe. Facial cones subvertical, rather long. Head ami thorax mote 

 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. 

 .\nal valve of male with a posterior lobe. 

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



T. calif arnica 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 witliout 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. (|uite straight on inner margin. 



T. Hiinuta Crawf. 



CiCi. Facial cones slightly divergem in apical half. Body slightly 



larger. T. tninuta similis Crawf. 



