43 
Part III.] Beeson : Beehole Borer of Teak . 
The writer has tried attracting ceramicus moths with lights of various 
intensity up to 200 c.p., using petrol lamps with white reflectors, but 
without success, (possibly because the work was done in May and June 
at the end of the moth season). Mr. R. Unwin tried light traps in the 
first fortnight of June, 1916 without success. Mr. A. It. Yillar tried to 
catch moths in April, 1916, by means of fires and lamps, but no specimens 
were seen. In view of these failures the following records are of interest. 
Dudgeon [1899, p. 645] says “ I took 2 males of this species [ceramicus] 
at Punkabaree, Sikkim in July and August. It must be rare as I have 
never seen others.” Seitz [1912, p. 418] says of the genus Duomitus 
“ The moths fly late at night and strongly attracted by light,” and of 
D. leuconotus, that “ the natives collect the insects on tree-trunks 
as well as at the light, the insect coming to the street lamps in the towns.” 
Of Duomitus punctifer it is said, that “ the male is an active flyer and 
is frequently attracted to light. The female does not fly so readity, at 
least until after the eggs are laid.” [Agric. News, Barbadoes, 1914, 
p. 328.] 
STAGE DATES. 
Field-data on the Seasonal History. 
1. The Egg Stage. 
No field records are available for the duration of the egg stage 
and the incubation period, but since captive moths lay eggs 2 or 3 
days after emergence and have a short life the egg-stage may be consi¬ 
dered as coincident with the moth stage. 
2. The Larval Stage. 
The subjoined table, Table 1, shows the dates on which larvae 
have been found in the field with their head measurements as body 
measurements are no reliable index to the age. It will be seen that the 
youngest larvae have been found as early as the 21st May, [Pyonchaung 
W. C. Rooke]; these, as all other young larvae collected, were in the 2nd 
instar. In the first week of June larvae of this size and slightly 
larger (1—0 to 2 # 0 mm. head width) have been taken by the writer in 
Pyinmana and Katha divisions. Larvae of similar or slightly larger 
dimensions have been taken as late as August [Petsut, J. W. Bradley]; 
Mr. Unwin notes of the Pyinmana observation area that “ the new boring 
of newly hatched caterpillars takes place in the first fortnight of June ” 
and records tlje discovery of larvae J to J of an in,ch long in bark 
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