INDEX 



579 



WooUy aphis, 162-170, 205, 271, 362. 



whitefly, 371. 

 Worsham, E. L., 193-199. 

 Worthley, L. H., 188-193. 



Xyleborus perforans, 226, 273. 

 Xylocrabro stirpicola, 431. 

 Xystus brassicae, 222. 



YeUows, 102. 



Yellow fever, 387, 390. 



birch, 544. 



foxtail, 180. 



scale, 511, 514. 

 Youngomyia quercina, 551. 



vernoniae, 552. 



Zenoleum, 48. 

 Zeuzera pyrina, 299. 

 Zizia aurea, 322. 



ERRATA 



Page 239, line 17, for contharis, read caniharsi. 

 Page 354, line 24, for prenolepsis, read prenolepis. 

 Page 381, line 17, for pastinacea, read pantinacce. 

 Page 381, line 30, for fruit-, read fruiti^. 



