142 BULLETIN 85, UNITED STATES NATIONAL MUSEUM. 



and long, sides straight and nearly parallel to near apex, then the 

 anterior margin is conspicuously emarginate, making a terminal tooth- 

 like process (fig. 133). Female. — Genital segment about as long as 

 rest of abdomen, stout; dorsal valve longer than ventral, slender 

 distad, pubescent. 



Described from one female (paratype), mounted in balsam, from 

 Dow's Swamp, Ottawa, Ontario, Canada (W. Metcalfe), June 14, 1903 

 (this specimen, together with paratypes of several other species, was 

 loaned to me by Miss E. M. Patch; her description of this species was 

 based on three females only); several males and females from 

 Marquette, Michigan (Hubbard and Schwarz), July 27; Placer County 

 and Nevada County, California (A. Koebele), September; Argus 

 Mountains, California (Koebele), on Pinus monopJiylla, May, 1891. 

 It is possible that the latter do not belong to this species. 



PSYLLA MINUTA, new species. 



Figs. 99, 261, 316, 483. 



Length of body (male) 1.4 mm.; (female) 1.8; length of forewing 

 1 .8 ; width of head 0.75. General color brown to dark brown or black ; 

 thoracic dorsum and vertex light brown to brown, sometimes dark; 

 scutum with stripes of a lighter color; antennae mostly dark; femora 

 and tibiae usually mostly brown or darker. Body small. 



Vertex a little more than half as long as broad, bulging forward 

 narrowly on each side of front ocellus, somewhat pubescent, with a 

 round fovea on each side discaUy; genal cones slender, strongly 

 divergent, separated at base, acute at apex, not quite as long as 

 vertex, with several long setas distad; antennae one and a half to one 

 and three-fourths times as long as width of head, slender. 



Thorax very strongly arched, with very sparse pubescence. Legs 

 slender; hind tibiae with basal spur very small or wanting. Wings 

 small, venation typical, conspicuously fumate in apical half, some- 

 times darkly so ; pterostigma long, rather large. 



Genitalia. — Male. — Anal valve a little longer than forceps, broad 

 (in caudal view), apex rounded, pubescent; forceps about 0.30 mm. 

 long or more, converging to a simple black point at apex, entire 

 surface rather densely covered with large, heavy spine-Hke setae. 

 Female. — Genital segment as long as rest of abdomen or longer, 

 acutely pointed, broad at base, dorsal valve longer than ventral. 



Described from numerous males and females from American Fork 

 Canon, Utah (Hubbard and Schwarz), on Purshia tridentata, June 13; 

 Williams, Arizona (Barber and Schwarz), on PursJiia tridentata, May 

 25-28; Argus Mountains, California (Koebele), May, 1891; Ormsby 

 County, Nevada (Baker); a number more from Colorado, with no 

 data. Some of these specimens bear the manuscript name of Psylla 

 pursMie Riley, and Brachypsylla purshise. 



Type.— C&t. No. 18108, U. S. Nat. Mus. 



