12 
BULLETIjST 901, U. S. DEPAETMENT OE AGEICULTURE. 
Table VIII.— ri7?ie and duration of period in ground of A. chalyhea, North East, Pa. 
1917. 
Date of 
entering 
ground. 
Date of 
emergence. 
Number 
of indi- 
viduals. 
Duration 
of period. 
Date of 
entering 
ground. 
-L'ate 01 
emergence. 
Number 
of indi- 
viduals. 
Duration 
of period. 
Days 
■Davi 
June 28 
Julv 23 
\ 
25 
Julv 11 
July 30 
2 
19 
* 27 
3 
25 
11 
Aug. 1 
1 
21 
juiy ^ 
26 
2 
22 
13 
July 31 
2 
18 
5 
26 
1 
21 
13 
Aug. 2 
2 
20 
7 
27 
1 
20 
14 
2 
3 
19 
8 
27 
4 
19 
15 
July 31 
16 
8 
28 
3 
IS 
15 
Aug. 1 
1 
17 
9 
30 
1 
21 
15 
3 
1 
19 
10 
28 
1 
18 
17 
1 
3 
15 
10 
29 
1 
19 
17 
4 
1 
18 
10 
30 
3 
20 
11 
28 
4 
17 
1 42 
2 19. 24 
1 Total. - Weigbted average. 
Described from a large series of beetles reared at Xorth East, Pa., under Quaiatance 
No. 16427. 
Cat. No. 22290, U. S. National Museum. 
THE EGG. 
PI. I, C. 
Similar to that of Altica chalyhea. Length 0.75 mm., width 0.35 mm. 
Color straw yellow. Brownish strand much larger proportionately than that of the 
■ ' large form, ' ' about one-half the length of the egg. 
The size and color are as described bv Comstock (12). 
Table IX. — Frepupal period of 
A. chalyhea, North East, Pa., 
1917. 
Number of 
Duration 
prepupse. 
of period. 
Days. 
2 
7 
2 
8 
11 
9 
4 
10 
4 
13 
1 23 
2 9.17 
1 Total. 
2 Weighted average. 
THE LARVA. 
PI. II, A. 
Similar to the larva of the " ' large form " ( J., chaly- 
hea) but much smaller. The chitinized areas are 
smaller proportionately and the fully fed lar^-a is 
distinctly yellow without the brownish color ele- 
ment. The setge on the ventral prothoracic seg- 
ment are wanting . Width of head : First instar from 
0.292to0.312 m m . , average 0.306 mm . ; second instar 
from 0.435 to 0.458 mm., average 0.453 mm. ; third 
instar 0.577 to 0.624 mm., average 0.612 mm. 
Average length of full grown larva 5 mm. 
the pupa. 
PI. II, B. 
The writer knows of no characteristic by which this pupa may be distinguished 
from that of its larger relative except that of size. The average length is 3.5 mm. 
Table X. — Pupal stage of A. chaly- Table XI. — Callow period of adult 
hea, North East, Pa., 1917. stage of A. chalyhea, North East, 
Pa., 1917. 
Number of 
Duration 
pupae. 
of period. 
4 
Days. 
4 
s 
G 
9 
3 
10 
1 17 
2 8.47 
Number of 
Duration 
individuals. 
of period. 
Days. 
4 
1 
13 
2 
2 
3 
1 
4 
1 20 
2 2 
i Total. - Weighted average. 
1 Total. ^Weighted average. 
