LLUSTRATIONS. 



I'l.ATi:. 



i'age 

 I'LATE VII. Economic Ale.vi'odul.-c. Fig. 1. — AJcynxlcs lioirardi, on orange. 



Fig. 2. — AIciirodirKs unoiuf. Fig. :>. — AlPiiroihs raporario- 



ruiii. on toli.'icco W2 



TEXT FIGURES. 



Fio. 23. Aleyrodcs hoirarili, showing copious secretion from pupse, on lower 



surface of orange leaf 01 



24. AJejirodcH hoirartU: I'upa case and details 92 



IV 



