es a 
THE CLOUDY-WINGED WHITE FLY: LIFE HISTORY AND HABITS. 95 
The relative lengths and location of other spines of the body do not differ from 
similar spines on A. citri, neither do there appear differences in the structure of the 
antenne, legs, vasiform orifice, or mouthparts when examined under a one-sixth inch 
objective. Particles of wax secretions are found in varying 
amounts on the ventral surface, sometimes in such abun- 
dance as to make microscopic examinations difficult. 
Second larval instar—Lenegth, 0.42-0.51 mm.; width 
0.28-0.37 mm. Except in point of size no differences 
have been discov- 
ered between this 
and the correspond- 
ing instar of A. cilrv. 
Third larval instar 
(fig. 16)—Leneth, 
0.66-0.9mm.; width, 
0.48-0.68 mm. Ex- 
cept in size no differ- 
ences have been dis- 
covered between this 
and the correspond- 
ing instar of A. curt. 


Fic. 16.—The cloudy-winged 
white fly: Ventral view of 
crawling larva of the third 
instar. Greatly enlarged. 
(Original.) 
Fig. 17—The cloudy-winged white fly. eee ee 
Pupa: a, Ventral view; 6, enlarged vasi- i al : et f 
form orifice; c,enlarged margin. @, Greatly nh gener a appeal ance the pupa 0. 
eniarged; 6, ¢, highly magnified. (Orig the cloudy-winged white fly (fig. 17, a, 
nal.) 
b,c) resembles very closely that of the 
citrus white fly. No striking structural differences have been dis- 
covered between them. They are, however, very distinct, and one who 
has examined them carefully can readily separate them without the aid 
of alens. The most important differences are 
in the larger size and thinner and flatter appear- 
ance of the pupa of the cloudy-winged white 
fly. The difference in outline is shown in figs. 
9, c, and 17, c. Their skins are more mem- 
branous, making them more delicate and easily 
crumpled. Furthermore, after thickening be- 
fore maturity they do not develop the bright 
red or orange spot on the middle of their backs, 
and the wing pads and body of the adult (fig. 
18) are more easily seen. The pupa case (PI. 
VIII, fig. 3) is much thinner, more membranous, 
and falls from the leaf more readily. Its walls 
do not remain rigid as do those of A. ecitri, but 
because of their more delicate structure col- 

Fic. 18.—The cloudy-winged 
white-fly: Dorsal view of 
pupa, showing adult insect 
about to emerge. Greatly 
enlarged. (Original.) 
lapse after the emergence of the adult and present the crinkled 
appearance shown in the illustration, 
