384 
Journal of Agricultural Research 
Vol. XXVIII, No. 4 
LOCATION OF PUPA AND LENGTH OF UNDERGROUND PERIOD 
The pupa (PI. 1, F, and PI. 4) occupies a smooth-walled cell within a spherical 
pellet of earth an inch or two below the surface of the ground. Jenne observed 
the time elapsing between the entering of the soil by the larvae and the emergence 
of the adults in 80 cases. Table III sets forth his data. 
Table III.— Number of days spent underground in the act of pupation by the 
cambium curculio at Gainesville , Ga., in 1910 
Number of 
insects 
Period under¬ 
ground 
Days 
1 
17 
13 
18 
13 
19 
25 
20 
18 
21 
6 J 
22 
1 
23 
2 
24 
1 
29 
Observations in West Virginia showed that a considerably longer period may 
be required in some cases. In one instance a number of larvae entered the soil 
under outdoor conditions on July 16. On September 15, 62 days later, live 
adults were still within the soil, although evidently ready to issue. 
THE ADULT 
DESCRIPTION 
The adult cambium curculio (PI. 1, A, B) is a small active snout-beetle from 
3.5 to 5 mm. in length. The head, thorax, and under parts are dark brown to 
black and the legs and elytra reddish brown. The upper parts are clothed thinly 
with lighter colored hairs which form two narrow whitish lines on each side of the 
thorax, a broad, yellowish, oblique stripe at the base of each elytron, and a 
broad grayish band behind the middle of the elytra. The legs are marked, 
especially on the femora, with whitish bands of short hairs. The slightly curved 
snout is nearly as long as the head and thorax combined. 
SEASONAL OCCURRENCE AND LONGEVITY 
The beetles make their appearance from hibernation fairly early in the spring. 
Blatchley and Leng (1, p. 481 ) record taking specimens at Dunedin, Fla., on 
February 27 and March 17. Jenne captured specimens at Gainesville, Ga., 
April 16-30. Snapp began to secure beetles of this species in jarring peach 
trees at Fort Valley, Ga., on April 17. At French Creek, W. Va., the beetles 
appear by the middle of May and are present throughout the summer, activity 
being greatest during June and July. Two of the beetles which Jenne collected 
in April at Gainesville, Ga., were still alive on the 5th of the following Novem¬ 
ber, another lived until September 11, and another until October 15. Jenne 
obtained beetles of the second generation from July 8 to August 9. Sixty-one 
of these young beetles were placed in an outdoor cage containing dry oak leaves 
on November 4 for the purpose of observing winter mortality. Of the lot placed 
in the cage at least 59 per cent were still alive on March 8 of the following spring. 
