150 BULLETIN 85, UNITED STATES NATIONAL MUSEUM. 



impressions; genal cones long, at least as long as vertex, usually 

 longer, slender, moderately divergent, rather acute at apex, pubes- 

 cent. Antennae nearly twice as long as width of head. 



Thorax well arched. Legs stout; hind tibiae with a distinct basal 

 spur. Wings slightly tinged with yeUow, venation and shape typical; 

 pterostigma small and narrow. 



Genitalia. — Male. — Anal valve long, sides subparallel, pubescent; 

 forceps elongate, slender, strongly bowed, reaching nearly to tip of 

 anal valve, acutely pointed. Female. — Genital segment unusually 

 large and thick, as long as rest of abdomen, dorsal valve a httle longer 

 than ventral. 



Described from several males and females from Sheridan, Wyoming 

 (C. W. Metz), August, 1910; Arboles, Colorado (C. F. Baker). These 

 bear the manuscript name of Psylla americana ahdominalis Crawford. 



Type in author's collection. 



PSYLLA STRIATA Patch. 

 Psylla striata Patch '11:14. 



Length of body (male) 1.9 mm.; (female) 2.3; length of forewing 

 2.7; width of head 0.82. General color greenish yellow, antennas 

 black or brown on apical third. 



Close to carfinicola, differing chiefly in antennae and genal cones; 

 antennae distinctly shorter, not over twice as long as width of head, 

 often less and relatively thicker; genal cones shorter; body somewhat 

 smaller; wings more flavous; pterostigma moderately broad at base. 

 Male genitaha similar to carpinicola; female genital segment rela- 

 tively a Httle shorter. 



Described from one female (paratype), from Orono, Maine (Patch), 

 on birch (Betula sp) June 25, 1910; two from Portland Maine (E. P. 

 Van Duzee), 7-7-'09; several of both sexes from Holderness, New 

 Hampshire (Koebele), on birch, October 2, 1884; several from Polk 

 County, Wisconsin (Baker). Several specimens from Colorado seem 

 to belong to this species, but this is not certain. Several others from 

 Marin County, CaHfornia, seem to be a varietal form of the species, 

 collected by A. Koebele on Corylus rostrata, August 11, 1885; these 

 bear the manuscript name of "Psylla coryli n. sp." but are wholly 

 distinct from P. coryli Patch. 



Miss Patch seems to have identified with her striata a number of 

 specimens of a closely related but distinct species from New York 

 State. These have been referred to the species cephalica. 



The nymphs live on the terminal leaves and shoots of Betula, and 

 cover themselves with inconspicuous woolly masses. The mature 

 forms emerge late in June (Patch '11: 14). 



