21 
time adding a small amount of webbing. The latter was plainly to be 
seen on the glass of the jar. 
Some of the mature Boll Worms which had been left in the breed- 
ing cage without earth pupated unprotected on the floor of the same 
and later issued as moths. In another instance, however, the mature 
worm had been left in a newly-made breeding cage. The next morn- 
ing the worm was found to have nicely webbed together the sawdust 
accidentally left in the corner, and had formed a neat little cell, which 
might almost be called a cocoon. This shows plainly that the Boll 
Worm is capable at least of spinning a certain amount of web for its 
cell, whether it always does so to so great an extent or not. 
It was stated above that the worms pupated about 2 or 3 days 
after having entered the earth. This, however, applies only to the 
months of August, September, and October. Later the time is longer, 
as is shown by the following observations: On November 1 a mature 
Boll Worm from a breeding cage was taken to a cotton fieid and placed 
on solid earth, a large open tin can being placed about the worm so 
as to compel it to make its burrow under observation. The work of 
digging its burrow was begun at once, and by the next day it had dis- 
appeared below the surface. A small conical-shaped mound of loose 
earth was formed about and over the opening of the burrow. On No. 
vember 4 two other mature Boll Worms were similarly placed in open 
cans, the one on solid earth, the other on earth which had been dug up 
and made very loose. So faras could be seen without digging the bur- 
rows were nade exactly as the one just mentioned. 
On November 14 all the burrows were carefully followed up with a 
small trowel, to determine depth, condition of the burrows and cells. 
The worm placed on solid earth, November 1, had proceeded as follows: 
Down for an inch, then slanting at about an angle of 120 degrees for 
2 inches more when the cell had been made upward. The cell was 
about anineh and a half long, and was therefore within an inch or less 
of the surface. Very little webbing was noticeable along the burrow, 
and but little in the cell. The burrow was about 0.25 inch in diameter, 
larger at the distal end, aud contained a small amount of loose earth 
along its entire length; also a plug of loose earth about 0.25 inch long 
at the distal end next the cell. Having been in the earth 2 weeks, I 
was surprised to find that the worm hadnot yet pupated. The burrows 
and cells of the other two worms were examined, but no special differ- 
ence worthy of note was found. The peculiar facts in all were: (1) 
That the cells were all inclined and higher than the lowest part of the 
burrow, thus bringing the pupa above the latter; (2) that the cells 
were so near the surface; (3) that the larve were all found with their 
heads at the upper end of the cell, wherefore the pup would have 
been found with the anterior portion highest and resting on posterior - 
end; (4) that they had not pupated after having been in the earth so 
long a time. 
