THE MONTHLY BULLETIN. 



299 



They are light at first, but soon turn dark. The eggs of the woolly whitefly are 

 without reticulations, dark brown, and generally arranged in circles (see Figs. 103 

 and 101 1. 



The first stage larva; are not much larger than the eggs, have six legs, and move 

 about freely for a few hours, or uutil they iusert their beaks and remain stationary. 

 The change from stage to stage consists in growth and a shedding of each larval 

 skin until the fourth stage is reached. The fourth stage larva (Fig. 105) changes to 

 the pupa by a gradual development until the adult whitefly is visible inside the 

 larval skin. 



The adult emerges through a T-shaped slit and after about six hours may begin to 

 deposit eggs to the number of 250. 



The larvae and pupae of the common whitefly are light greenish with but three 



Fig. 98. — Eggs and adults of common whitefly on citrus 

 leaf. Enlarged about 2jj times. (Courtesy Florida Ex- 

 periment Station. Bui. 67.) 



Fig. 99. — Eggs of common whitefly on the left. Smooth surface. Enlarged about 

 80 times. Eggs and eggshells of cloudy-winged whitefly. on the right. Netted surface 

 and wide openings. Enlarged about SO times. (Courtesy Florida Experiment Station, 

 Bui. 97.) 



marginal filaments of waxy secretion in the pupal stage. A brick-red spot is visible 

 in the back of the pupa. This is the same for the cloudy-winged whitefly, except 

 that the latter does not have the brick-red spot. The larvae of the woolly whitefly 

 are, after the first stage, dark or almost black, and develop a waxy fringe in the 

 second stage (Fig. 103), and the woolly secretion, from which the insect received its 

 name, in the third stage. The pupa is also covered with the woolly secretion. 



