GRAPEVINE FLEA-BEETLES. 
11 
DURATION OF CALLOW PERIOD. 
The duration of the callow period of the adult stage varied from 1 
to 4 days with an average of 2 days. The records are summarized in 
Table XI. Records on this period extended from July 24 to August 4. 
SUMMARY. 
Table VI. — Second larval stage of 
A. chalybea, North East, Pa., 
1917. 
Number 
Duration 
of larvaa. 
of stage. 
Days. 
3 
5 
18 
6 
26 
7 
8 
3 
8 
9 
1 
10 
1 
11 
1 60 
2 6. 95 
1 Total. 
2 Weighted average. 
There is only one generation annually, winter being passed in the 
adult stage. Beetles emerge from hibernation when the grape buds 
are swelling and oviposition begins soon 
after and continues until about the middle 
of June, a few days before the latest 
adults disappear. 
The average duration of the incubation 
period in 1917 was 15.18 days. 
The larval feeding period averaged 
24.26 days in 1917. Records of feeding 
larv9B began June 4 and continued until 
July 20. The duration of the differ- 
ent larval stages was as follows: First 
stage, 8.74 days in 1917; second stage, 
6.95 days in 1917; third stage, 7.75 
days in 1916 and 8.53 days in 1917. 
The duration of the period in the ground averaged 20.71 days in 
1916 and 19.24 days in 1917. Records taken during the two years 
on the transformations of this beetle 
while in the ground extended from June 
22 to August 4. The duration of the dif- 
ferent stages in the ground in 1917 was 
as follows: Prepupa 9.17 days, pupa 8.47 
days, callow adult 2 days. 
THE LESSER GRAPEVINE FLEA-BEETLE. 
(Altica woodsi n. sp.) 
The specific name A. woodsi is given in 
recognition of Mr. Woods's recent sys- 
tematic and biological studies of mem- 
bers of the genus Altica (2S, 26), and 
because he is the first to record what is 
Table VII. — Feeding period of 
third larval stage, A. chalybea. 
North East, Pa., 1917. 
Number 
Duration 
of larvse. 
of stage. 
Days. 
1 
5 
6 
6 
10 
7 
5 
8 
10 
9 
11 
10 
2 
12 
2 
13 
1 47 
2 8. 53 
Total. 
Weighted average. 
probably this insect as a new species. 
DESCRIPTION OF STAGES. 
THE ADULT. 
PI. IL D. 
This beetle is similar to Altica chalybea, from which it may be distinguished as fol- 
lows: Color metallic green, rarely with purple or olivacious reflections; antennal 
joint 3 equal in length to joint 4; average length 3.05 mm., varying from 2.43 to 3.05 
mm. 
