SEASONAL HISTORY. 
49 
in each jar, which made it easier for the insects to move about and 
made the conditions more natural. Grape foliage, constituting the 
food of the beetles, was supplied daily, and to prevent unhealthy con- 
ditions in the cages the old leaves were always removed. For op- 
position short pieces of grapevine cane were placed with the beetles, 
and as egg depositions progressed these canes were removed daily 
and replaced by fresh ones. In determining the number of eggs 
deposited, the loose bark had to be peeled off the pieces of cane and 
the eggs in each cluster carefully counted. In determining the egg 
deposition of individual females and the length of life of male and 
female beetles, pairs when found in copulation in the stock jars were 
MAY 
5 10 15 20 25 
JUNE 
5 10 IS 20 25 
JULY 
5 IO 15 20 25 
AUG. 
5 10 IS SO 25 
SEP 
5 io is % 
r. 
0 2S 
OCT. 
5 io is 20 %S 
NOV. 
5 io i5 20 as 
y 
OL 
odl t 
J/s 
fit 
a? 
pa 
Ol 
To 
fl 
r?e 
r s 
f 
PS 
f' 
3 
ro 
/ 
> 
- 
Ol 
'/ 
0 
i 0 
n 
% 
— - 
- 
ot 
I 
f 
*$ 
7- 
u 
., 
te 
n 
c 
«> 
ft/ 
r 
Fig. 23.— Diagram illustrating seasonal history of the grape root-worm as observed during 190V at 
North East, Pa. (Original.) 
isolated previous to the earliest egg deposition. The observations on 
the habits of these individual beetles are given in Table II. 
Since the greater portion of the beetles from the emergence cages 
was used in obtaining the egg records, and since these insects ovi- 
posited undisturbed during the entire season, it is believed that the 
records in figure 15 represent the relative occurrence of eggs in the 
field. 
Eggs used in determining the length of time of incubation were 
kept in glass tumblers under the outdoor breeding shelter. 
In conjunction with the rearing work. Held observations were con- 
stantly made, and in certain instances collections of the insect in its 
different stages were regularly made in the same localities for a given 
length of time. Thus it has been possible to check the rearing obser- 
51282°— Bull. 89—10 4 
