New York AGRICULTURAL EXPERIMENT “STATION. 203 
Parts of the plant selected for oviposition Oviposition occurs 
in the corky portions of the wood, near a bud or branch, or in 
the overgrowths caused by pruning. A cut or break in the bark 
is a favorite place. When the infestation is marked, eggs can 
be readily found in the callosities caused by injuries of this 
beetle in previous years. 
The egg period.— The egg stage lasts eighteen to twenty days. 
This was determined as follows: A number of beetles were 
permitted to feed upon and to oviposit for one day in an unin- 
fested cutting from the stem of a nursery poplar. This opera- 
tion was repeated on succeeding days, fresh wood being used 
each time. The beetles were then excluded, the cuttings being 
kept in moist sand under cover to prevent reinfestation. After 
remaining for fifteen or more days, the entire bark was carefully 
examined, to ascertain the number and condition of the eggs 
deposited in the respective cuttings. The following is the 
result: 
Tas_e I.— Time or INCUBATION oF Ecc or C. lapathi. 









haeaben 
; Date of Date of etween Condition in which the eggs 
ater Oviposi- examina- iste aNpaie'. were found on examination 
: tion. tion. a watiindl 88S. of the bark. 
tion. 
I'S Sept. — Oct. Days. 
1 13 4 21 6 | Eggs hatched and larvae be- 
ginning to feed. 
2 14 Zs 19 2 | Eggs about ready to hatch. 
3 15 4 19. | 1 | Egg just hatched. 
4 16 4 18 2 | Eggs hatching. 
S 18 9 21 2 | Eggs hatched and larvae be- 
ginning’ to feed. 
6 19 4 15 4 | Eggs nearly ready to hatch. 


DESCRIPTION OF THE LARVA AND ITS GROWTH. 
Larva, Sept. 22, 1905.— When newly hatched, the larva is a soft 
fleshy grub destitute of feet and bearing a number of very fine 
hairs. It is 1.6 mm. long and .6 mm. thick at the broadest 
points, and .4 mm. at the caudal extremity. It is somewhat 
shining and of a pale yellow color, being whitish toward the 
caudal extremity. The head is hght brown and the mouth- 
parts are dark brown, the tips of the mandibles and maxillae 
being black. The body is nearly cylindrical in form, tapering 
a little behind and swollen at the anterior extremity. 
Larva, April 19, 1906.— At this time the larva has much the same 
appearance as the newly hatched form, except that it is larger, 
