yo JOURNAL OF THE 



habit when disturbed of feigning death. It is said to be nocturnal 

 in its habits; but it is also partially diurnal, as many times I have 

 seen them in copula, and they have frequently been observed flying 

 about the factory during the day. 



Soon after pairing the male dies, and the female does not live 

 long after she has finished depositing her eggs. 



Second Annual Generation. — The second period of transformation 

 into the adult state occurs about the last of August and during the 

 month of September. Those which 1 bred from eggs deposited June 

 30 were transforming from the middle of September to the end of 

 the first week in October. September 28 I examined some smoking 

 tobacco which was put up July 6, The condition of the insect was 

 about the same as of those which I reared. This would indicate 

 that the eggs were deposited on the tobacco at the time of its prep- 

 aration for placing in packages. During the month of September, 

 with some variations, seems to be the beginning of the second an- 

 nual generation. Allowing the same time for larval development as 

 in the case of the summer generation the larvae would be ready in 

 November and December for constructing the cocoons preparatory 

 to pupating. However, as the investigations have been in progress 

 only a little more than half a year, I have not had an opportunity 

 of studying the stages of the second generation. But I judge from 

 the condition of things as I found them in the factory in January 

 that the earliest of the brood would construct cocoons in the latter 

 part of the fall or early winter, and in rooms where the temperature 

 was favorable would pupate and transform into the adult. If the 

 temperature of the room is too low for the functional activity of the 

 metamorphic state, the insect would remain in the larval state during 

 the winter. From January 11 I kept a larva in its cocoon for three 

 months before pupating. 



The greater number of individuals of the second generation would 

 probably pass the winter in a torpid state, and feed during the 

 spring sometime before pupating. It may be possible that under 

 some conditions there are three annual generations, but the indica- 

 tions thus far seem to favor their being in general only two. A con- 

 tinuation of the present investigations is necessary to determine this 

 point. 



REMEDIES. 



Precautionary Measures. — The precautions usually recommended 

 are as follows: The steaming of the leaf tobacco should be thorough 



