92 BULLETIN 85, UNITED STATES NATIONAL MUSEUM. 



hind margin and a longitudinal dorsal stripe; scutum with several 

 orange stripes; femora black, tibise orange; antennae as in maura; 

 female genital segment usually dark with an orange spot dorsad. 

 These colors may be much less pronounced in some forms, though 

 this is typical. 



Vertex and head rather similar to maura. Wings smoky, seldom 

 fulvous, usually broadly rounded at apex. Male anal valve similar, 

 but smaller, as in salicis, distinctly more pubescent; forceps more 

 pubescent. Female. — Genital segment very short, as in maura, 

 dorsal valve blunt at apex. 



Described from many specimens from Alta, Utah (Hubbard and 

 Schwarz), June 30, on Salix sp.; Banff Springs, Alberta, Canada (Hub- 

 bard and Schwarz), June 10; Placer and Nevada Counties, Cahfornia 

 (Koebele), September; Colorado (Gillette). 



Type.— Cs,t. No. 18088, U. S. Nat. Mus. 



The most typically colored specimens are from Alta, Utah. 



TRIOZA LONGICORNIS Crawford. 



Figs. 193, 367, 521. 



Trioza longicornis Crawford '10b: 359. 



This is apparently very close to varians and perhaps identical. 

 The type, and only, specimen on which the description was based 

 is not before me, and therefore I am unwilling to refer it to varians. 

 It has not been included in the synoptic tables because certain of its 

 characters are not known to me. The following description is 

 adapted from the original one. 



Length of body 2.4 mm; length of fore wing 3.6; width of head 0.72. 

 General color greenish yellow, notum slightly darker. 



Vertex sharply defined on front margin, with two broad depressions 

 diverging toward front margin from the usual foveas near posterior 

 margin; emarginate in front at median Hue; genal cones long, fully 

 as long as vertex, divergent, acute at apex, pubescent. Wings trans- 

 parent, about two and a half times as long as broad, broadly rounded 

 at apex; Rs long; veins yellowish. 



Genitalia — Female. — Genital segment short, about as long as pre- 

 ceding ventral sclerite, dorsal valve longer than ventral. 



Described from one female from Vancouver, British Columbia. 



Type.— Ceit. No. 18089, U. S. Nat. Mus. 



TRIOZA NICARAGUENSIS Crawford. 



Figs. 212, 339. 534. 



Trioza nicaraguensis Crawford '11a: 436. 



Length of body 1.7 mm; length of forewing 3.1 ; width of head 0.55. 

 General color lemon yellow; antennae black at tip. Insect small. 



Head not as broad as thorax, finely punctate; vertex not deeply 

 sulcate, with a small fovea on each side, bulging forward on each 

 side of the median line in front; genal cones short, scarcely two- 



