132 BULLETIN 85, UNITED STATES NATIONAL MUSEUM. 



Genitalia. — J/aZg.-^Genital segment small, inconspicuous; forceps 

 small, short, stout, with a black hook-like spine at tip; anal valve 

 relatively not very long, curved, simple, sides subparallel. Female. — 

 Genital segment short, retracted into abdomen beneath; dorsal valve 

 longer than ventral, with a prominent convexity dorsad; ventral 

 valve short, acute at tip, with a long projection laterad toward dorsal 

 convexity. 



Described from numerous males and females collected in Ormsby 

 County, Nevada, by C. F. Baker, and four specimens from Colorado 

 (Baker); fourteen from Placer County, California (Koebele), Sep- 

 tember, on Purshia tridentata, eleven from Nevada County, California 

 (Koebele), September, on same host, and four from Siskiyou County, 

 California (Koebele). 



Type in author's collection. 



Genus PSYLLOPSIS Loew. 

 Psyllopsis Loew '78: 587. 



Head deflexed rather strongly; vertex not sharply defined on 

 anterior margin but merged into genae; genal cones perpendicularly 

 inclined, acutely conical, divergent, not continuing plane of vertex. 

 Antennae at least moderately long. Thorax well arched; pleural 

 suture of prothorax as in Arytaina, but pronotum not knoblike at 

 lateral termination. Wings ovate, subhyaline, usually with a 

 pterostigma. 



Type of genus. — Psyllopsis fraxinicola Forster. 



SYNOPSIS or SPECIES. 



a\ Antennae about two and a half times as long as width of head; first marginal cell 

 not twice as large as second; male anal valve very broad in lateral aspect. 



fraxinicola Forster. 



a^. Antennae over four times as long as width of head; first marginal cell three times as 

 large as second; male anal valve slender mexicana, new species. 



PSYLLOPSIS FRAXINICOLA Forster. 



Figs. 21, 47, 230, 280, 439. 



Psylla fraxinicola Forster '48: 73.— Meyer-Dur '71:399. — Scott '76:544. — Loew 



'77:138. 

 Psyllopsis fraxinicola Lo-Ew '78:588; '88:14.— Reuter '81: 153.— Scott '86: 281.— 



Edwards '96:234.— Sulc '06:2.— Oshanin '07:348.— 



Felt '11:39. 

 Psylla viridula Forster '48:74.— Meyer-DDr '71:399. 

 PsyllafraxinolaMEYER-DvR '71:398. 

 Psylla unicolorFLOR '60: 479; '61:340,347 353. 

 Psylla chlorogenes Meyer-Dur '71:399. 



Length of body, 2.5 mm.; length of forewing, 3.2; width of head, 

 0.90. General color, greenish-yellow throughout. 



Head strongly deflexed, not quite as broad as thorax, punctate; 

 vertex anteriorly roundly sloping down toward genal cones, without 



