ILLUSTRATIONS 
PLATES. 
Page. 
Plate I. Fig. 1. — Orange covered with sooty mold. Fig. 2. — Leaf of orange 
coated with sooty mold Frontispiece. 
II. Fig. 1. — Aleyrodes mori on mulberry. Fig. 2. — Woolly white fly 
{Aleyrodes howardi) on orange. Fig. 3. — Paraleyrodes persese on 
orange. Fig. 4. — Woolly white fly (Aleyrodes howardi) showing 
eggs in circles, and adults. Mg. 5. — Aleyrodes sp. on sea grape. . . 10 
III. Fig. 1. — Sooty mold on orange following white-fly attack; broken and 
falling from leaf. Fig. 2. — Sooty mold on cinnamon tree following 
attacks by cinnamon scale 18 
IV. Fig. 1. — China tree defoliated during winter. Fig. 2. — Same tree in 
full foliage in summer 34 
V. Fig. 1. — Leaflet of umbrella China tree showing infestation by A. 
eitri. Fig. 2. — Umbrella China tree infested by A. citri, showing 
orange trees in rear of house 34 
VI. Fig. 1. — Nursery citrus trees infested with white flies, set out in an 
isolated noninfested grove without having leaves removed. Fig. 
2. — Buggy in an orange grove; buggy-top full of adult white flies 
ready to be carried to other groves. Fig. 3. — Train at station; adult 
citrus white flies swarming from near-by umbrella China tree into 
coaches ready to be carried for miles down the Florida east coast. . 48 
VII. Fig. 1. — Rearing cages in position on orange trees. Fig. 2. — En- 
larged rearing cage 52 
VIII. Fig. 1. — Leaf showing pupa cases of A. citri; also pupae and eggs. 
Fig. 2. — Leaf showing heavy infestation by A. citri. Fig. 3. — 
Leaf showing pupa cases of A. nubifera 62 
IX. Fig. 1. — Tender shoot swarming with adult citrus white flies. Fig. 
2. — Leaf of same, enlarged 66 
X. Fig. 1. — Adults of A. nubifera, the cloudy-winged white fly, and 
many eggs scattered over leaf. Fig. 2. — Larvae and pupae of both 
the citrus white fly and cloudy- winged white fly killed by fumi- 
gation, and eggs of the citrus white fly along midrib 98 
TEXT FIGURES. 
Fig. 1. Map showing distribution of the citrus white fly (Aleyrodes citri) in 
Florida 26 
2. Diagram of laboratory grounds at Orlando, Fla 37 
3. The citrus white fly: Eggs 53 
4. The citrus white fly: Larva, first instar, dorsal view 59 
5. The citrus white fly: Larva, first instar, ventral view 59 
6. The citrus white fly: Antenna and left hind leg; first instar larva 59 
7. The citrus white fly : Larva, second instar, ventral view 60 
8. The citrus white fly : Larva, third instar, ventral view 60 
7 
