The Cane Grubs of Australia. 43 
CACACHROA DECORTICATA Macleay. 
THE EGG, 
LENGTH OF STAGE. 
Lot Number. Se of Date Deposited. Hatched. | eke ea 
ors Bc 3 Febuary 7-14 -. | By February 24 .. 10-17 
eee oe 16 December 22-29 .. | By January 6 | 8-15 
Ones 36 12 December 29-2 Jan. | By January 14-18 .. 12-20 
Gh ro o 5 January 2-6 .. | By January 16-19 .. 10-17 
5 a8 | 37 December 22-29 . | By January 7-10 .. 9-19 
Gita. 20 5 December 29-2 Jan. | By January 14 5c 12-16 
| Average 13°75 
DURATION OF PERIOD OF OVIPOSITION. 
Eggs have been obtained from beetles reared in confinement on all 
dates from December 22 to January 6. The only eggs laid by beetles 
taken in the forest and kept in confinement were obtained between 
February 7-14, 1913. 
DEPOSITION. 
The eggs are deposited singly or in clusters of less than six, these 
in confinement. No eggs have been obtained in their natural situation. 
' 
PERCENTAGE OF LARVA: REARED. 
When obtained in confinement, the eggs “were placed in fine, sifted,. 
damp earth, in glass vessels, at a depth of an inch or two. The following 
table shows the percentage of mortality :— 
- Number of Eggs Placed in Vessel (only - 
Lot. Number. those in Apparently Good Condition). Larve Hatched. 
[i .;. : 3 3 
2 : 12 12 
Gly Fass i 1 9 
rt a ; 5 a) 
5 : 37 | 20 
Ge ie me 5 | 5 
ee De oh 20 itil 
Qin te 19 | i 
lll 76 = 68:-468% 
