psYLUD note;s. 233 



ExpivANATioN OF Figures. 



The photomicrographs were taken by Mr. Royden Hammond from 

 balsam mounts prepared for study. The frontal cones are in some cases 

 spread apart more in these mounts than in pinned specimens or in life ; 

 and, as is evident enough, in order to bring the cones into correct focus, 

 the occipital aspect is sometimes brought into view where the prepara- 

 tion is particularly transparent. 



Fig. 316. Trioza aylmeriae. Fig. 317. T. forcipula. Fig. 318. T. 

 diospyri. Fig. 319. T. dubia. Fig. 320. T. longistylus. Fig. 321. T. 

 marginata. Figs. ■^'^■2 and 2>22)- T. maura? Fig. 324. T. quadripunctata. 

 Fig. 325. T. stylifera. Fig. 326. T. tripunctata. Fig. 327. AUotrioza 

 arbolensis. Fig. 328. Neotriozella ottawanensis. Fig. 329. Paratrioza 

 cockerelli. 



Fig. 330. Trioza aylmeriae. Fig. 331. T. diospyri. Fig. 2>Z'^- T. margi- 

 nata. Fig. ZZZ- T. quadripunctata. Figs 334 and 335. T. stylifera. Fig. 

 ZZ^- T. tripunctata. Fig. ZZI- T. maura? Fig. 338. T. forcipula. Fig. 

 339. AUotrioza arbolensis. Fig. 340. Paratrioza cockerelli. Fig. 341. 

 Neotriozella ottawanensis. 



Fig. 342. Trioza forcipula. Figs. 343-346. T. aylmeriae.- Fig. 347. T. 

 quadripunctata. Fig. 348. N. ottawanensis. Fig. 349. T. maura? Fig. 

 350. T. forcipula. Fig. 351. T. maura? Fig. 352. T. dubia. Fig. 353. 

 T. quadripunctata. Fig. 354. N. ottawanensis. Fig. 355. T. forcipula. 

 Fig- 356. T. stylifera. Fig. 357. T. diospyri. Fig. 358. T. collaris. Fig. 

 359. T. maura? Fig. 360. T. marginata. Fig. 361. T. longistylus. Fig. 

 362. T. stylifera. 



Fig- Z^Z, A. artemisiae angustipennis, Lot 1348-41 ; Fig. 364, A. 

 calthae? Lot 1348-53; Fig. 365, A. communis, i348-39b ; Fig. z^^, A. 

 fascipennis, Lot 1339-24; Fig. z^-], A. sp.. Lot 1347-39; Fig. 368, A. 

 nebulosa americana, Lot 1348-65; Fig. 369, A. nubifera. Lot 1348-48; Fig. 

 370, A. polygoni, Lot 1341-7; Fig. 371, A. sp., Lot 1347-38; Fig. 372, 

 A. rumicis, Lot 1341-6; Fig. ZTZ, A. sp., Lot 1347-39; Fig. 374, A. com- 

 munis. Lot- 1347-37; Figs. 375 and Z7^, A. angustipennis, Lot 1347-24; 

 Fig. Z7T, A. rumicis. Lot 1341-6; Fig. 378, A. calthae? Lot 1348-53; 

 Fig- 379, A. polygoni. Lot 1341-7; Fig. 380, A. picta, Lot 1348-29. Fig. 

 381, A. sp., Lot 1347-39; Fig. 382, A. calthae? Lot 1348-53; Fig. 383, A. 

 polygoni, Lot 1341-7; Fig. 384, A. calthae? Lot 1348-47; Fig. 385, A. 

 nebulosa americana. Lot 1348-65 ; Fig. 386, A. angustipennis, Lot 1348-41 ; 

 Fig. 387, A. polygoni, Lot 1341-7; Fig. 388, A. picta. Lot 1348-29; Fig. 

 389, A. communis, Lot i347-32b ; Fig. 390, A. sp.. Lot 1347-38. 



Fig. 391, Psylla coryli. Lot 1348-61; Fig. 392, P. ribis. Lot 1348-25; 

 Fig- 393, P- negundinis. Lot 1348-11; Fig. 394, P. hartigii. Lot 1340-2; 

 Fig. 395, P- annulata, Lot 1345-2; Fig. 396, P. gilletti. Lot 1348-20; Fig. 

 397, P- breviata, Lot 1347-36; Fig. 398, P. pyricola, Lot 1326-4; Fig. 



