RED CEDAR CHESTS AGAINST MOTH DAMAGE. 5 



experiment "was started revealed no living adults, no eggs, and no 

 larvae. In a trunk serving as a check to which the same number of 

 adults were added at the same time, more than 50 live larvae were 

 counted on the flannel at the close of the experiment. This is the 

 only reference in literature to the effect of cedar chests upon adult 

 clothes moths. 



The following data indicate that the cedar chests used by the 

 writers have little practical effect upon the length of life or upon the 

 egg-laying of adult moths. The data are incomplete, but sufficient to 

 prove that adults developing in chests from larvae transforming to 

 the pupa stage in the chests can live at least 10 days, which in 

 longevity experiments conducted as checks was about the average 

 length of life under normal conditions. It is possible, moreover, for 

 such adults to mate and deposit eggs that will hatch. 



On June 17, 1920, 15 adults (sex undetermined) newly emerged in 

 chests were placed with cloth in Chest 1. On June 26, 11 were alive 

 and eggs had been laid. On June 28 all adults were dead, and 123 

 eggs had been laid ; by July 6 all eggs had hatched. Twenty larvae 

 removed from the chests on June 28 continued to develop normally 

 outside the chest. 



On July 2, 1920, 7 adults (sex undetermined) emerging in the 

 laboratory were introduced with cloth into Chest 2. Adults were 

 found depositing eggs on July 3. Examination on July 17 showed 18 

 eggs had been deposited, 14 having hatched. One adult was barely 

 alive, being too feeble to crawl. 



On March 28, 1921, one group of three virgin moths and another 

 group of five, emerging within cedar chests, were placed with cloth in 

 Chest 1. Examination on May 31, 1921, showed all adults dead, and 

 53 and 30 eggs deposited, respectively. These eggs were infertile and 

 did not hatch. 



On March 30, 1921, 6 adults '(sex undetermined) found emerged in 

 cedar chests were placed the same day in Chest 2, with cloth. Ex- 

 amination on April 28 showed 1 adult alive, about 80 eggs laid and 

 hatched, and living and dead larvae. 



EFFECT UPON EGGS. 



Cedar chests have no apparent effect upon clothes-moth eggs. This 

 is true of eggs deposited in the chests by females emerging in the 

 cheats or by females emerging in the laboratory and placed in the 

 chests for oviposition, and of eggs laid outside of chests and later 

 introduced into them. Scott, Abbott, and Dudley (17) state that 

 an examination of a piece of flannel containing many clothes-moth 

 eggs •!'■', days after it was placed in a cedar chest showed that practi- 

 cally all the eggs were hatched but that the resulting larva 1 had died 

 almost immediately. A duplicate test by them gave identical re- 

 sults. 



Or. June 5 and is. and July 10. L920, and February 12, March 3, L0, 

 and 28, A.pri] 27. May 7 and 11, and June 6, L921, an average of 

 about 300 eggs, ranging in age from 1 to 7 days, were introduced into 

 each of lour cedar chests. Of 50 experiments conducted to determine 

 the effect* of chests upon the egg vitality the following L0 are recorded 

 as typical : 



(1) Twenty-sis adult- (sea; undetermined) wen- found March 28, 



L921, having developed in cedar chests from larva' introduced into 



