92 
In the male the o-enitalia are quite peculiar and consist of two fan- 
like lamellae, thickly fringed with long pale ochraceous hairs, which 
partiall}^ inclose the claspers (fig. 11). AYhen everted the tufts of 
yellow hairs are very noticeable, but at rest 
they are almost completel}^ retracted within 
the abdomen. 
Copulation was observ^ed only once, in a 
small bottle and under ver^^ abnormal condi- 
tions. The moths were united end to end, 
as is the usual habit among moths. Many 
Fig. ii.-Genitaiia of male boihvorm other individuals havc coDulated in the breed- 
moth (original). . . • . i i i ^ i ^ i 
mg ]ars m the laboratory, but never when 
under direct observation. 
PROPORTIONS OF THE SEXES. 
A number of observations were made aq^ixiata concerning over 300 
moths were collected which bear evidenc^^n the proportions of the 
sexes. These include records of moths collected in the field and of 
those bred out in the laboratory. In practically all cases there is a 
slight preponderance of females in the ratio of 168 females to 120 
males. Since the sexes are not readily distinguished externally, that 
of each specimen was determined by dissection. It might be suggested 
that the small number of males may be due to their greater agility in 
eluding capture in the field, but the records from the laborator}^ 
breeding do not bear out such a conclusion. 
LENGTH OF LIFE. 
The life of the moths seems to be determinexi almost entirely by the 
external conditions after emergence, especially by the supply of 
available food. During the season some eighty specimens were kept 
in breeding jars in the laboratoiy and subjected to variable conditions 
in order to ascertain the length of life. A short summarj^ of the 
results is given in the table below. 
Table X^^XYl.-— Average length of life of moths in laboratori/, 1904. 
Month. 
Males. 
Females. 
With 
food. 
Without 
food. 
With 
food. 
Without 
food. 
Mav 
Days. 
7J 
Days. 
Si 
Days. 
9i- 
16 
12 
13 
18 
Hi 
Days. 
5i 
3 
6 
6 
12 4i 
10 i 4 
July 
August 
September 
14i 
11 
lOi 
4 
October 
Longest life of males, 19 days 12 hours, during September. 
Longest life of females, 38 days, during September-October. 
