THE JUMPING PLAN"T-LICE OR PSYLLID.E OF THE NEW WORLD. 143 



PSYLLA CORYLI Patch. 



Very similar to minuta in most respects, including size and general 

 proportions; color lighter. Vertex less pubescent, similar in form. 

 Male anal valve similar ; forceps distinctly shorter, not over 0.20 mm, 

 in length, with similar spine-Hke setae on inner surface, but only on 

 basal half; apex with a conspicuous notch on outside near tip, giving 

 he appearance of an inner apical tooth. Female not known to me. 



Described from one male (paratype) from Colorado (no data), 

 kindly loaned to me by Miss Patch. This species is exceedingly close 

 to minuta, and were it not for the constant difference in the male 

 genitalia I would not hesitate to include them both in one species. 



It should be noted that the manuscript name of Psylla coryli Riley 

 has been attached to another species, represented in the National 

 Museum collection, which is close to carpinicola (Fitch's carpini). 

 Miss Patch states that the present species also was known by the 

 same manuscript name. 



PSYLLA ALBA, new species. 



Figs. 254, 321, 490. 



Length of body (male) 1.6 mm; (female) 1.9; length of fore- 

 wing 2 to 2.2; width of head 0.69. General color greenish white; 

 antennae black at tip. 



Vertex about half as long as broad, with two foveas as usual, 

 bulging in front rather roundly; genal cones nearly or fully as long 

 as vertex, not strongly divergent, subacute, pubescent. Antennas 

 about one and three-fourths times as long as width of head. 



Thorax not strongly arched. Legs small, short; hind tibiae about 

 as long as femora, with basal spur very small or wanting. Wings 

 whitish, clear, typical in shape and venation ; pterostigma moderately 

 large. 



Genitalia. — Male. — Anal valve longer than usual, of usual elongate 

 form, pubescent; forceps small, simple, rather strongly bowed, 

 slender, acutely pointed at tips. Female. — Genital segment about as 

 long as rest of abdomen, dorsal valve a little longer than ventral. 



Described from many specimens of both sexes from Ormsby County, 

 Nevada (C. F. Baker); Claremont, California (Baker); Sacramento, 

 California, on Salix, longifolia, July; Folsom, California (Koebele), on 

 same host plant; Las Vegas, New Mexico (Barber and Schwarz), 

 August 8; El Paso, Texas (Cockerell), May 13. Some of these bear 

 the manuscript name of Psylla americana alba Crawford. 



Type in author's collection. 



