COCCIDJ3. 



529 



Gmelin (Figs. 531, 532) in Illinois, and states that June 6th 

 most of the eggs were hatched, though the young had not left 

 the scales ; on the 9th the weather being " exceedingly warm," 

 the young (Fig. 532, 2) were found running all over the twigs ; 

 on the llth they all became fixed, and the day after a white 

 waxy secretion began to issue from the body in the shape of 

 very fine, delicate threads (3). On the 22d they had increased 

 materially in size, the waxy secretion vanished soon 

 after tue last date, leaving what appeared to be the 

 body of a yellowish brown color, though in reality 

 the body is underneath and separate, and has lost all 

 trace of members. On the 6th of July the secretion 

 rapidly increased and assumed an oval form, and 

 the insect was of the form indicated at 5. On the 

 10th the scale presented the appearance indicated at 

 4. Two days after a third plate began to be secreted 

 from the posterior end of the insect, and enlarged \ 

 rapidly, becoming of the same color as the back. By I 

 the first of August their growth was to all appearance 

 completed, the scale measuring .12, while the insect 

 is only .05 of an inch long, thus occupying about 

 half the space within (7). On the 12th of August Fig. 531. 

 they began to lay eggs, and by the 28th all had ceased egg-lay- 

 ing, while the body shrivelled up. There is but a single brood, 



Fig. 632. 



the eggs laid late in summer, hatching in the following spring. 

 Thus it appears, according to Riley's observations, and as Har- 

 ris supposed, that the shell-like scale is secreted from the sur- 

 34 



