XX11 



LIST OF ILLUSTRATIONS. 



343. Tip of hawthorn shoot in- 



jured by Psylla cratcegi 367 



344. Twig of alder injured by 



Psylla alni . . .368 



345. 

 346. 

 347. 



CICADID/E. 



Typhlocyba ulmi . . 373 

 Typhlocyba ulmi . . 373 



Young form of Typhlocyba 

 ulmi . . . .374 



COLLECTING, PREPARATION, 

 and MOUNTING. 



348. 



349. 

 350. 

 351. 



Simple arrangement for 

 dissecting specimens 

 under a magnifying- 

 glass .... 



Proboscis of honey-bee . 



Tongue of house-fly 



Life - history stages of 

 " Swallow-tail" Butter- 

 fly ... . 



379 

 384 

 384 



385 



