THE JUMPING PLANT-LICE OR PSYLLID^ OF THE NEW WOELD. 157 



County, Nevada (C. F. Baker). Some of these bear the manuscript 

 name of Psylla alni gossypiona Crawford, having been separated from 

 the variety americana on too shght differences. 



Type in author's collection. 



Nymphs. — Abundant on the lower surface of the alder leaves in 

 summer and fall, conspicuous because of the dense white flocculent 

 substance with wliich they cover themselves, as described for 

 Jloccosa; length 1.8 to 2.5 mm. Color pale brownish, or often brown; 

 caudal half of abdomen darker, with dark cross-bands on basal half. 



PSYLLA CAUDATA, new species. 

 Figs. 88, 259, 305, 472. 



Length of body (male) 2.2 mm.; (female) 4.1; genital segment of 

 female 1.9; length of forewing 4.3; width of head 0.98. General color 

 brown to blackish; dorsum of head and thorax with irregular pale 

 stripes, bands, or spots; antennae and legs brown to fuscous; abdo- 

 men mostly blackish. 



Vertex less than half as long as broad, relatively a little longer 

 than in preceding species, less concave; genal cones large, as long as 

 vertex, rounded at apex or often subacute, pubescent. Antennse 

 over two and a half times as long as width of head. 



Thorax strongly arched. Hind tibise with large basal spur. Wings 

 clear, transparent; veins black and prominent, venation tjrpical; 

 pterostigma moderately large. 



Genitalia. — Male. — Anal valve not much longer than forceps, 

 abruptly narrowed just before apex; forceps moderately long, some- 

 what enlarged at apex, apex truncate and bifid or rather deeply 

 emarginate, as in astigmata. Female. — Genital segment extremely 

 long, nearly as long as rest of body, very slender, acuminate and 

 curved upward in caudal third or half, very acute at apex, dorsal 

 valve longer than ventral; with an apparent suture across both 

 valves near the center. 



Described from several males and females from ToUand, Colorado 

 (Cockerell), on Alnus tenuifolia, August, 1911; Pagosa Sprmgs, Colo- 

 rado (Baker); several others with data "Colo," and no more. 



Type in author's collection. 



PSYLLA GALEAFORMIS Patch. 

 Fig. 144. 



Psylla galeaformis Patch '11 :12. 



Length of body (male) 2.2 mm.; (female) 3.8; genital segment of 

 female 1.3; length of forewing 4.2; width of head 0.96. General color 

 orange to reddish brown, sometimes rather dark; paler ventrad; thorax 

 with paler markings, somewhat as in caudata, but less conspicuous. 



Similar to caudata in most respects, but genal cones usually more 

 acute; antennae nearly three times as long as width of head; hind 



