196 PHIL RAU AND NELLIE RAU 
PROPORTION OF SEXES 
The accompanying table shows the proportion of sexes of the 
different lots. The grand total shows the males to be in excess, 
and especially so in the Prometheas. Here the proportion cor- 
responds well to the 111 males and 65 females noted by Mayer 
in 1899.1 
TABLE 15 
Proportion of sexes 
YEAR SPECIES MALE FEMALE TOTAL 
1809 Sa GEClOpla ne nen enennerie ke 43 25 68 
1909 SCO GEO plate ewer renee a | 22 13 35 
{OT0 HS scecropias. A eer : 101 | 104 205 
1911 Ss/COCROPLAs Ane aes | 171 168 339 
1911 So AGRO ONE IN Ws soos on 4b oa 79 | 60 139 
1911 S. cecropia, incubator......... 72 90 162 
1911 Ca promevheaw eer re 116 | 67 183 
1911 TT AWN aes oe Soe 36 26 62 
igi || La pelyphemusi. ones 13 8 | Pall 
MUG trail © ok BS eg eee ee ta 653 561 | 1214 
PRIORITY OF MALE EMERGENCE 
The evidence gleaned from this material substantiates Dar- 
win’s conclusion that the males are the first to emerge. In every 
lot excepting the Lunas this was apparent, and in nearly every 
case where a break in the continuity of emergence occurred, the 
first subsequently to emerge were also males. 
In order to get some tangible proof of this priority, the mean 
date of emergence was gotten for the males and females of the 
different species. The difference between these dates would ob- 
viously be the mean priority of all of one sex over the other. The 
differences given in table 16 are in favor of the males in all cases 
excepting the Lunas. 
The emergence of the insects on each day is shown in the accom- 
panying curves. Graphs were made for only those species of 
which we had sufficient numbers to make the curves reliably 
16 Psyche, vol. 9, p. 15, 1900. 
