Part VII] Beeson: Life History of Toon Borer . 27 
Since the number of cocoons collected was over 2,000 and the number 
of moths emerging was under 200, it is evident that only the later portion 
of the brood was represented and that the emergence of first generation 
moths actually commences much earlier than the 29th April. It is also 
probable that cocoons of the second generation were collected simul¬ 
taneously with those of the first. This is borne out by the results 
obtained in 1916, in which year all of the individuals of definite broods 
were collected by means of sack-bands. 
1916. The emergence records for 1916 are given in connection with 
those of the 2nd generation moths (vide infra , p. 41) from which it will 
be seen that the moths of the first generation begin to appear on 8th 
April and emergence continues until about the 1st May and that the 
two broods overlap. 
2. The second generation. 
Larvae of the second generation. 
1914. On the 12th May, 1914, young and half grown larvae were 
detected for the first time feeding inside ripe and semi-ripe fruits. From 
this date fruits were regularly collected from trees known to be affected, 
and moths were successfully bred out in May and June. No observations 
were made on the larval development. 
1915. Throughout the month of May, 1915, all stages of the larvae 
and pupae of the toon moth were met with in the field. On the 14th 
May, it was observed that swarming was fairly general and that the majo¬ 
rity of broods were mature. 
Experiments were carried out in the insectary to determine the lengths 
of the larval and pupal stages, and of the feeding period, and to observe 
the feeding habits. The larvae were confined in separate pottery jars, 
similar to those used for the experimental work on the first, or flower 
generation. Toon fruits were given singly to each larva, and replaced 
when the edible portions had been consumed. A constant degree of 
humidity was maintained by standing the pots in a shallow depth of 
water ; without the artificial production of the necessary humidity it 
was found that the fruits dried up rapidly and were abandoned by the 
larvae. The larvae fed voraciously and attacked fresh fruits within a 
few minutes of receipt. On reaching full size, the larvae constructed a 
cocoon of silk in a corner of the pot or in the folds of the muslin cover. 
[ 172 j 
