44 
Indian Forest Records. 
[Vol. VIII. 
chambers formed between the 3rd and 15th June. He found new borings 
on the 17th and 25th June and on the latter date noted that larvae Jrd 
to \ an inch were prevalent to the exclusion of smaller sizes. New 
borings appeared between the 28th June and the 14th July. The avai 1 - 
able information suggests a very late appearance of larvae as compared 
with the moth emergence dates ; either the incubation period of the egg 
is prolonged or the larvae hatching in the hot weather do not survive. 
From the feeding habits of the insect the writer is inclined to consider 
that the larval period begins slightly before the first rainfall, when the 
movement of sap commences in the tree, and that larvae hatching before 
the bast has resumed activity are either checked in their development 
or perish. There is evidently necessity for detailed investigation into 
the egg and first larval instar since these are apparently the most vulner¬ 
able stages, and about which least is known. 
Table 1 . —Stage dates of larvae of Duornitus ceramicus, Burma. 
Date. 
No. of 
Indivi¬ 
duals. 
11th April 1907 . . 1 
18th April 1914 . . 2 
Head measurements. 
Locality. 
Observer. 
3-45 mm. 
3-85—4-30 mm. 
Toungoo . . Forest Zoologist. 
Petsut, Katha, S. T. Ditto. 
24. 
21st April 1914 . 
24th April 1914 . 
20th April 1919 
2nd May 1919 . 
25th May 1919 . 
21st May 1919 . 
31st May 1919 . 
21st, 30th May 1916 
7th June 1919 . 
10th, 11th June 1918 
5th June 1918 . 
6th June 1919 . 
8th June 1919 . 
14th, 17th July 1918 
August 1912 
9th August 1917 
7th, 8th September 
1914. 
7th October 1918 
19th November 1918 . 
1 3-80 mm. 
1 3-70 mm. 
3 2-95—3-25 mm. 
Okkyi, Shwegu; H. 
H. D. 43 ex bee- 
hole. 
Petsut, Katha, ex 
S. T. 28. 
Yanaungmyin, Pyin- 
G. F. Mathews. 
Forest Zoologist. 
Ditto. 
2 
1 
5 
2 
Several . 
Do. . 
Do. . 
Several . 
2 
4 
3-12—3-83 mm. 
3-75 mm. 
3-20—4-60 mm. 
3-45—4-40 mm. 
1-07—1-3 mm., 
some newly moul¬ 
ted. 
1-1 mm. 
1- 5 —1-8 mm. 
3-30 mm. 
3-10—3-80 mm. 
3-90—4-15 mm. 
2- 05—2-87 mm. 
1- 60—2-80 mm.* 
I 2-75—3-10 mm. 
i 
2- 30—2-65 mm. 
4-0 —4-25 and 4-80 
mm. 
mana. 
Kaing, Pyinmana, 
in heartwood gal¬ 
lery. 
Pyonchaung, North 
Toungoo. 
Mohnyin, Katha, ex 
beeholes. 
Okkyi, Shwegu 
Pyonchaung, North 
Toungoo; It. It. 
D.150. 
Petsut, Katha 
Yanaungmyin, Pyin¬ 
mana. 
Ditto 
Okkyi, Shwegu 
Petsut, Katha, ex 
beeholes. 
Bondaung, South 
Toungoo; It. It. 
D. 468. 
Petsut, Katha 
Kaing, Pyinmana; 
It. It. D. 334. 
Kyaukkyi, Shwegu; 
It. It. D. 66, about 
1J* deep in sap- 
wood. 
Bondaung, South 
Toungoo; It. It. 
D. 488. 
Ditto. 
Ditto. 
Ditto. 
Ditto. 
W. C. Hooke. 
Forest Zoologist. 
Ditto. 
Ditto. 
Ditto. 
Ditto. 
A. Lawrence. 
J. W. Bradley. 
A. J. Butterwiok 
G. F. Mathews. 
A. Lawrence. 
1 5-37 mm. 
Pyonchaung, North 
Toungoo ex bee- 
hole. 
W. C. Hooke. 
[ 272 ] 
