THE JUMPING PLANT- LICE OR PSYLLID^ OP THE NEW WORLD. 95 



acute at apex, valves subequal in length (Sulc figures the dorsal valve 

 as a little longer than the ventral, '12: pi. 32). 



Described from eleven males and females collected in San Mateo 

 County and Alameda County, Cahfornia (O. E. Bremner), November 

 18, 1911, on Laurus nobilis. These infested trees had been imported 

 from Belgium several years previous. The species is well known and 

 destructive throughout Europe, but so far the San Francisco Bay 

 region is the only place in this country in which it has been found. 



NyTwph. — The half-grown or mature nymph is Ught to dark brown, 

 somewhat mottled with Hghter spots, about 1.5 to 2 mm long, ovate 

 in shape and flat. The entire dorsal surface, including wing pads, is 

 covered with conspicuous spine-like processes; margin with a fringe 

 of similar spines. Young nymph pale green, spines smaller. A 

 white cottony substance is produced by the nymphs, in which they 

 are wrapped. The leaves of the laurel are badly curled and thickened 

 by the action of the nymphs, and the insects may be found in con- 

 siderable numbers within these leaf-rolls or pseudo-galls. 



The Ufe cycle of the insect in this country is probably similar to 

 that in Europe, from where these individuals came. Loew thinks 

 that the adults emerge in May or June, and a second brood appears 

 in late summer and passes the winter in hibernation, then oviposit 

 early in the spring. The nymphs from these eggs develop the first 

 brood of that year. In Cahfornia the time of emergence may be 

 earlier because of the more favorable chmate. 



TRIOZA VIRIDIS Crawford. 

 Figs. 182, 183, 351, 353, 511. 



TVwza OTridis Crawford '10a: 230; '10b: 350. 

 Allotrioza viridis Crawford '11a: 446. 



Length of body 2 mm; length of forewing 2.4; width of head 0.62. 

 General color greenish yellow, female ovipositor black at apex; 

 antennae brown or black apically. Body small. 



Head much narrower than thorax; vertex three-fourths as long as 

 broad, with a deep and conspicuous sulcate depression on each side 

 of median line and more or less parallel to it; genal cones three- 

 fourths as long as vertex, divergent, rather thick, subacute at apex, 

 extending in nearly the same plane with vertex, pubescent. Antennae 

 over twice as long as width of head, slender. 



Thorax arched only a little, broad; pronotum moderately long. 

 Hind tibiae with two very smaU black spines at apex on inner side, 

 one outside. Wings small, transparent, about two and two-thirds 

 times as long as broad, acute at apex; Rs very short. 



Genitalia. — Male. — Genital segment small; anal valve not longer 

 than forceps, rectangular in outline, about twice as long as broad, 

 sharply flexed caudad a little at about end of basal third, sides sub- 



