328 Annals Entomological Society of America _[Vol. VII, 
The following table in which the maximum, minimum and 
average longevity at each of the three temperatures is recorded 
for the order excluding the family with which it is compared, 
will show the above statement to be correct. 
Table 3. Taxonomic Groups and Longevity. 


















Temperature. 
Order Family High 72° F. ||Medium 62°F.|| Low 42° F. 
Longevity in Days. 
Max|Ave.|Min ||Max|Ave.|Min_||Max|Ave. |Min. 
Muscide...| 3 2 1 es bas 6 3 || 15 8 3 
@©fher Wipteray os e.tlie sea eee - 4 126) ls 2.5| 1 || 2¢ 4 1 
Curcu- 
lionide....| 15 9.9| 4 || 25 6:1) 2 33 ) T38) 
Other! Coleoptera calles. sess 7 5.8) 1 a Z 5 || 39 | 24.6} 6 
Cynipide...| 15 5 1 ee 5) Sa) Ma hl il gl Lore 2 
Other Hymenoptera]............ 15 5.2] 1 8 5 3 || 15 i) oe 
Chalcidide | 15 Bt yee] ae | 9.8] 3 
Other Hymenopteral............ is: |) Bal 1 7 egies 17-2 ab 

2. That the longevity of insects in general is lengthened by 
a decrease in temperature and shortened by an increase in 
temperature (when these temperatures are between 42° and 72° 
F.) | 
Table 2 proves this to be true in all except two cases: (a) 
Coleoptera in general have a slight increase in longevity at. 
high temperatures over that of the medium temperature. 
(b) Fleas in the three specimens tested show increase in 
length of life as the temperature increases. (c) (Arachnida 
have the greatest longevity at medium temperature). 
3. That the difference in longevity of a species at different. 
temperatures corresponds roughly to the difference in tempera- 
ture. Table 4 shows that the greatest difference in length of 
life is between the longevity at Low and the longevity at Me- 
dium temperatures—this corresponds to the greater difference 
between Low 42° F. and Medium 62°F. as compared with the 
difference between Medium and High 72°F. 
