268 "Journal of Comparative Neurology and Psychology. 



Series il. Mated, decapitated and stimulated one to several days after issuing. 

 Table IV. 



Series 12. Decapitated, afterward mated, mate removed, moth stimulated. 

 Table V. 



Series 13. Mated (or unmated), dethoraxed and not stimulated. 



Series 14. Mated, dethoraxed, stimulated. Table VI. 



Series 15. Dethoraxed, stimulated, then commissures connecting each abdom 

 inal ganglion cut consecutively from anterior to posterior. 



A large number of moths were under observation in each series 

 (from ten to forty) and care was exercised to obtain healthy moths 

 from well-fed larvae. 



Tables I and II give the following data in regard to fourteen 

 of the individuals (seven in each series) under observation in 

 Series i and 2; length of life, number and frequency of groups of 

 eggs oviposited and total number of eggs oviposited. Nearly all 

 of these moths issued upon the same day (at most one or two days 

 apart), hence under practically the same general environmental 

 conditions of temperature, etc. The data here recorded are typi- 

 cal of that for all the individuals observed in these series. Indi- 

 viduals in Table I (Series i) are normal unmated moths; in Table II 

 (Series 2) are normal mated moths. 



The average length of life of moths in each series is thirteen 

 or fourteen days, average number of eggs in Series i, 411, in Series 

 2, 421. The unmated moth, therefore, lives as long as the mated 

 moth, and each oviposits the full quota of eggs, as comparison of 

 the two tables shows. The essential difference in behavior in the 

 two series is indicated in the total number of egg-laying periods 

 and in the difference in number of eggs placed during any one 

 period by a single individual. In Series I (unmated moths) the 

 egg-laying period averages eight days, a maximum of ten days, a 

 minimum of six days. In Series 2 (mated moths) the egg-laying 

 period averages three days. Only occasionally is the egg-laying 

 period extended into the fourth day. 



In No. 7 (Table II), for some unaccountable reason, the moth, 

 while ovipositing the normal number of eggs in the three-day 

 period, did not begin to oviposit until she was six days old. This 

 is unusual. 



In unmated moths, during the long periods intervening between 

 the egg-laying periods, the alluring glands are almost constantly 

 extruded. In mated moths, remating ensues in the intervening 

 periods. 



