64. ROBERT STANLEY McEWEN 
TABLE 4 
MALE FEMALE TEMPERATU RE 
SUES EAUCS UNEP ere ie © coh eee et 68.9 SiG DAR Se 
PeECOMAETES tata asan facto ee aes 59.9 85.3 24.4° 
4 BY Uti XG | HSS gee eae OPER stat Gap ain acetieg iy 5s 83.5 DAS ie 
ANCL eee ee INS PE RT a Og NR 61.4 85.5 
Difference between males and females............................ 24.1 
Rotalemumberkotemalesyuce csi eee 47 
horalsnumberiotetemalesaused s.-eria tana eee eee 47 
fey) at pe 8.) NRA Uae REE PEN UEL WR. Ss dks dS teed ees 94 
group was put through the series at 6 days, and the results 
were practically similar to those obtained from the 9 day flies. 
For the sake of uniformity, however, they are not included in 
the following summary (table 5). 
TABLE 5 
MALE FEMALE TEMPERATURE 
Ruins Gt OSitd eee ec one hace or oe iene T6 78.3 Dhyailte 
SECON. CES THM et i Dict Seen eee re one te. 74.8 83.9 254° 
Suir tester nme oe eh cre eee ee ee aane 76.8 83.3 DABS. 5)° 
DANN RUT ahs oh 5 siete Be Nee ARES ene aan ts Be 74.4 81.8 
Ditierence between! males and: females: sss.44..64.0cee eee eee Cae: 
Rotalenumbernohummalessusedsss see eaeeee eerie 48 
otal mumberotaemalessused eases eee eee 48 
Totalag eer TTA Saeko ake edo eee 96 
| 
A glance at tables 4 and 5 is sufficient to indicate the general 
results. It again appears that the younger flies, both male and 
female, are fatigued by successive tests, whereas the older in- 
sects actually improve. Also it is clear that although the fe- 
males are more active than the males in both cases, they are 
relatively less so in the older groups. Not only this, but the 
older females are absolutely slightly less active than are the 
females of the younger group. In this particular instance, there- 
fore, 18 hours is actually the maximum age of activity. It may 
be added, however, that were the results from the 6 day flies 
