48o 



Journal of Agricultural Research voi. xvni, no. ? 



Partial records of temperature and humidity are given in Table III. 

 It is believed from the somewhat scanty data that the night-flying 

 habits of moths are but little influenced by these factors. On the other 

 hand, such meteorological conditions as strong winds, rain, or fog 

 materially restrict flight. 



Data as to the total collection of moths, arranged by hours of collec- 

 tion, are set forth in Tables IV and V. 



Table IV. — Numbers and percentages of males and of gravid and spent females arranged 



by periods of collection 



Period ending — 



8p. m 



9P-m 



lop. m. . . . 



11 p. m.. . . 



12 p. m 



1 a. m 



2 a. m 



3a. m 



4 a. m 



Total 



Number 

 of males 

 and fe- 

 males. 



Ntunber. Percent 



23 

 354 

 372 

 438 

 375 

 391 

 482 

 407 

 310 



3.150 



Males. 



15 

 194 



2IS 

 331 

 265 

 288 

 365 

 307 

 220 



«2, 200 



Number. Percent 



65. 2 

 54-8 

 57-8 

 75-6 

 70. 6 

 73-6 

 75-7 

 75-3 

 71 



Gravid females. 



7 

 143 

 145 

 88 

 82 

 78 

 75 

 63 

 55 



6736 



Number. 



30-4 

 40.4 



39 

 20 



22 

 20 



15-6 

 15- 6 

 17.7 



Spent females. 



I 



17 

 12 



19 

 28 



25 

 42 



37 

 35 



C216 



Per 

 cent. 



a 69.8 per cent of total number of moths. 

 6 23.3s per cent of total number of moths. 



c 6.8s per cent of total nimiber of moths. 

 Table V. — Summarized data, arranged by periods of collection 



o 69.8 per cent of total number of moths. 



6 30.2 per cent of total number of moths. 



It will be seen from these tables that in the first three periods, ending at 

 10 p. m., there were taken 325 females, or 35 per cent of the total of 952 

 females and 40 per cent of the total of gravid females. In the same 



