THE JUMPING PLANT-LICE OR PSYLLID^ OF THE NEW WORLD. 155 



NympTi. — Adult nymphs are oval in shape, flattened, about 3.19 

 mm in length more or less; head and thorax pale green, abdomen 

 pale yellow; eyes bright pink; tips of antennae, legs, and beak dusky; 

 densely covered with a white, flocculent fluffy mass, appearing, as 

 Miss Patch very aptly described them, as "walking ostrich plumes." 



"The eggs are probably deposited upon the alder in the fall, as the 

 newly-hatched psyllids appear about the time the alder leaves are 

 unfolding in the spring, and settle upon the ventral surface of the 

 leaves" (Patch '10: 301). Adults emerge about the middle or latter 

 part of June, in Maine. 



PSYLLA ASTIGMATA, new species. 



Figs. 87, 256, 257, 311, 471. 



Length of body (male) 2.3 mm; (female) 3; length of forewing 4.8; 

 width of head 0.95. General color yellowish green throughout, 

 antennae brown or black except three basal joints. 



Vertex not half as long as broad, roundly concave between elevated 

 posterior ocelli; genal cones about as long as vertex, divergent, rather 

 acute to subacute at apex, pubescent. Antennae nearly three times 

 as long as width of head. 



Thorax typical. Legs long; hind tibiae a little longer than femora, 

 with basal spur small or almost wanting. Wings very large, clear; 

 venation typical; pterostigma small or wanting. 



Genitalia. — Male. — Anal valve similar in form to that oi jloccosa; 

 forceps broad, black at apex, with apical margin distinctly emarginate 

 or bifid; the degree of this emargination varies; anterior subapical 

 margin sometimes roundly emarginate, making a long median tooth. 

 Female. — Genital segment short and thick, not as long as rest of 

 abdomen, nearly or fully half as thick dorso-ventrally as long; dorsal 

 valve a little longer than ventral. 



Described from several males and females from Polk County, Wis- 

 consin (Baker); Manitou, Colorado (Gillette); September; Placer 

 County, California (Koebele), on Prunus demissa, October; Sisson, 

 California (J. C. Bradley), August 19, 1908; Easton, Washington 

 (Koebele). 



Type in author's collection. 



PSYLLA TRIMACULATA Crawford. 

 Psylla alni trimaculata Crawford '11c: 631. 



Very close to astigmata, and perhaps not specifically distinct; 

 differs chiefly in having three large and very prominent red spots on 

 thoracic dorsum, one on anterior half of praescutum, and one on each 

 side of scutiun. Genal cones more acutely pointed. 



Described from two females, one from Gowanda, New York (E. P. 

 Van Duzee), August 2, 1907, and one from Lake Placid, New York, 

 August 15, 1896 (C. S. Sheldon). 



Type in author's collection. 



