190 PHIL RAU AND NELLIE RAU 
ficient evidence that long life in this case is a matter dependent 
upon climatic conditions. 
TABLE 6 
Ice-box Cecropias 
| DAYS 
CLASS 
Th, Aa) celle jaan irae al RTT ATV eV | fe) | MIEAGN 
| 6 7] 8 9 10 11 121314 15 16 17 18 1920 21 222324 25/26 27 28 29 303132 
ee eS LA eg I et ae PS PP fA de | || 
Res | | ‘| | 
EAE eric 3. gure earee ANN GM RR Ph | 1} 2} 1) 1) 1] | 1/2 1) |) 1 4) ae anes 
Bemaleqeecs sth bss. || a3) | |") fa a ls F At dle 18 19.39 
SAN ee Me ae dae | 1 | 32, 338 | [2 2 EEEEEE 4) 1) 1} 42 | 18.60 
| | | | | | 
This ice-box material compares well in the duration of life with 
the early lot of 1910, but the fact must not be forgotten that in 
spite of being kept in the ice-box at a temperature of 9 to 11° C., 
the insects were not so sluggish as they were during some of the 
much colder days of 1910. Could the refrigerator have been 
properly regulated, no doubt a greater period of life could have 
been attained. That the animals were far from inactive was 
evident from the worn condition of the wings. Copulation and 
oviposition also occurred while under these conditions. The 
activities of these may not have been normal; still the profound 
sluggishness which was observed during the cold spells of the year 
before did not occur. 
ST. LOUIS MATERIAL, CECROPIA 1911 
The object of this work was to see if the population would split 
up into long- and short-lived groups as it did in 1910. 
This lot comprised 339 insects, 171 males and 168 females. 
Notes on the duration of life were made on 283 of this number. 
They emerged between May 8 and June 14. 
The 1911 population was tabulated in a correlation table (7) 
similar to the one for 1910. These emerged at the same time of 
year as did the late group of 1910, and the duration of life was 
practically the same. A chance break in the continuity of emer- 
gence (fig. 2) is probably due to the drop in temperature during 
those few days. This is also true for the break of only one day, 
June 7. 
