BULLETIN 1035, U. S. DEPARTMENT OF AGRICULTURE. 
Table 2. — Length of the larval stadium. 
No. 
Date of 
hatching. 
Date 
molted. 
Dura- 
tion. 
Mean 
temper- 
ature. 
No. 
Date of 
hatching. 
Date 
molted. 
Dura- 
tion . 
Mean 
temper- 
ature. 
1 
2 
3 
4 
5 
6 
Oct. 18 
Oct. 28 
Nov. 15 
Dec. 10 
Dec. 25 
Jan. 11 
Oct. 20 
Oct. 31 
Nov. 19 
Dec. 13 
Dec. 28 
Jan. 15 
Days. 
2 
3 
4 
3 
3 
4 
°F. 
76 
77 
75 
70 
68 
63 
7 
8 
9 
10 
11 
12 
Feb. 1 
Feb. 22 
Mar. 20 
Apr. 5 
June 5 
July 13 
Feb. 4 
Feb. 24 
Mar. 23 
Apr. 7 
June 7 
July 15 
Days. 
3 
2 
3 
2 
2 
2 
°F. 
65 
70 
72 
75 
76 
79 
THE FIRST NYMPHAL STAGE (THE PROTONYMPH). 
The first nymphal stage (fig. 3, d) differs from the larva in having 
four pairs of legs instead of three and is slightly increased in size. 
The extra pair of legs appears behind the last pair of legs of the 
larva. The segments of the legs become longer, as do likewise the 
bristles on the body and legs. The color of the body darkens. The 
abdomen in this stage becomes elongated as compared to the larva. 
The average length of the protonymph is 0.25 mm. 
For the most part the habits of the nymphal stage are similar to 
those of the larva. As with the larval stage the protonymph stage is 
divided into an active feeding period and a quiescent period prepara- 
tory to molting. The average length for the first nymphal stage is 
2.8 days. 
Table 3. — Length of the first nymphal stadium. 
No. 
Date 
emerged. 
Date 
molted. 
Dura- 
tion. 
Mean 
temper- 
ature. 
No. 
7 
i 
:? 
12 
Date 
emerged. 
Date 
molted. 
Dura- 
tion. 
Mean 
temper- 
ature. 
1 
2 
3 
4 
5 
6 
Oct. 20 
Oct. 31 
Nov. 19 
Dec. 13 
Dec. 28 
Jan. 15 
Oct. 22 
Nov. 3 
Nov. 23 
Dec. 18 
Jan. 1 
Jan. 18 
Days. 
2 
3 
4 
5 
4 
3 
°F. 
76 
77 
75 
70 
68 
63 
Feb. 4 
Feb. 24 
Mar. 23 
Apr. 7 
June 6 
July 14 
Feb. 6 
Feb. 26 
Mar. 25 
Apr. 9 
June 8 
July 16 
Days. 
2 
2 
2 
2 
2 
2 
°F. 
65 
70 
72 
75 
76 
79 
THE SECOND NYMPHAL STAGE (THE DEUTONYMPH). 
The second nymphal stage (fig. 3, e) is similar to the first nymphal 
stage except that it is much larger and more elongate. In its full- 
grown condition, however, it resembles more the adult, though the 
color is not as deep a red. It averages 0.38 mm. in length. 
The habits of the second nymphal stage are likewise similar to those 
of the larva stage. The average length for the second nymphal stage 
is 2.84 days. 
