RED CEDAR CHESTS AGAIXST MOTH DAMAGE. 9 
.5, and 2 being found during examinations made March IT, May 11, 
June 6, July 7, and July 23, respectively. 
Half to full-grown larvae placed in Chest 3 on February 11, 1921, 
developed as adults during the period March IT to June 6; 1, 2, 3, 2, 
and 1 moths being found during the examinations made on March 
17, May 12, May 31, June 6, and July 7. 
A miscellaneous lot of 100 larvae, apparently half to full grown, 
were placed in Chest 1 on April 9, 1921. Examinations made on May 
11, May 31, July 7, July 23, and August 3 showed that there had 
emerged 53, 2, 7, 0, and adults, respectively. Of 100 larvae of like 
age placed on April 9, 1921, in Chest 2, 42, 4, 2, 0, 0, and adults 
were found emerged on April 30, May 11, June 6, July 7, July 23, 
and August 3, respectively. 
Cedak Chests Kill Young Laev^. 
Cedar chests have a pronounced killing effect upon young clothes- 
moth larvae. Of the larvae hatching within cedar chests from the 
2,074 eggs recorded under the discussion of the effect of chests upon 
the vitalit}^ of the eggs, none were found alive during examinations 
made one month from the date the eggs were placed in the chests. 
Exception must be made for one larva hatching from eggs laid 
April 26-27, which were placed in Chest 3 on April 27, 1921, that 
was found alive during examinations made on May 12, 21, and 31, 
but which was dead by June 2. 
Practically all larvae hatching within the chests died within two 
weeks after hatching and a surprisingly large number died within 
two or three days of hatching. Exact data on this point are lacking 
because to obtain them would require the chests to be opened so 
frequently that their killing power would be weakened. Thus 
Chest 2 had been opened more often than Chests 1, 3, and 4 just 
previous to May 21 examination recorded in Table I, with the evi- 
dent result that its effect upon even very young larvae was quite 
seriously affected. Scott, Abbott, and Dudley say (17) that larvae 
hatching in chests " died almost immediately." As their examina- 
tion was made 23 days after the eggs were placed in the chest and 
as their work was done during warm weather, when the egg stage 
ranges from 4 to 8 days, their statement should be interpreted to 
mean that the larvae died without spinning webs or leaving signs of 
feeding. The practical point to keep in mind is that larvae hatch- 
ing within chests did not as a rule feed (PL IV and V) upon the 
cloth, and when they did, the damage done (PL III) would not be 
observed by the average person. 
While the statements made concerning larvae hatching within the 
chests from eggs placed there can not be as exact as could be wished 
because of variations in the length of the egg stage, the age of 
larvae recorded in Tables I and II is definitely known and can be 
compared with larvae accidentally introduced in clothing into chests. 
These larvae hatched in the laboratory and were placed in chests at 
the ages indicated. In these tables are recorded data secured from 
each of four chests grouped according to the age of the larvae and 
the date of examination. The numbers of the chests refer to the same 
chests in both tables. It will be seen that larvae hatching outside the 
chests and later introduced into the chests do not die immediatelv. 
