30 
From the above table we see (1) that the period of incubation 
for the eggs varies from seven to nine and a half days, with an 
average of eight and two fifths days; (2) that the feeding stage 
of the larvae varies from thirty five to forty-nine and a half days, 
with an average of forty days; (3) that usually from oue to two 
days elapse after the larvae are full grown before the cocoon is 
spun; (4) that the chrysalid stage lasts from ten and a half to 
fifteen days, with an average of thirteen days; and (5) that the 
period from the time the eggs are deposited to the emergence of 
the moths varies from fifty-nine and a half to sixty eight and a 
half days, with an average of sixty-three and three fifths days, or 
about nine weeks. 
Copulation takes place, in most cases, the same day the adult 
emerges, usually in the early morning, lasting from four to five 
hours, but oftentimes extending over a period of eight to ten 
hours. A single female will pair several times, and a male that 
was seen pairing on two different occasions on two successive days, 
on being removed to another cage, in which a freshly emerged 
female was placed April 11, 1895, paired again the same after¬ 
noon. The eggs deposited by this female that sam a night, hatched 
just ten days later, thus proving their fertility. The fern tie has a 
peculiar habit of resting with the anterior end of her body some¬ 
what elevated, the wings s'ightly spread, between which she pro¬ 
jects the tip of her abdomen, as shown in the illustration at b on 
page 9. Oftentimes she also extends her ovipositor from an 
eighth to a quarter of an inch (not represented in the figure), 
giving the abdomen the appearance of ending in a long spike. 
The female will assume this attitude for several days, or until 
copulation takas place. I have had as many as twenty five 
females in a cage at a time, where they often remained five or six 
days in this characteristic posi'ion before any males emerged. 
They are rather sluggish while pairing, and can be easily trans¬ 
ferred from one cage to another without being separated. 
The female usually deposits her first lot of eggs the night after 
the first copulation, and so far as my observations and experiments 
go, they are laid at night only. The egg-laying period of a single 
individual lasts five or six days, daring which time an average of 
about two hundred and. forty eggs are deposited. In mills 
they are usually deposited singly, but may often be found in 
chains of eight to ten. The largest number I have succeeded in 
getting from a single female is two hundred and seventy-one, and 
the smallest oue hundred and twenty. The total number de¬ 
posited by each individual in the above experiments is listed in 
the table. The female lives only two or three days after the eggs 
have been "deposited; and the average life of the male after 
pairing is from six to seven days. 
Professor H. Landois, of Mu ester, Germany, ascertained by an 
anatomical examination that the oight ovaries of an Ephestm 
kuehniella contained respectively, 66, 79, 80, 84, 85, 87, 92, 95 eggs, 
an aggregate of 668. 
