6 BULLETIN 554, U. S. DEPARTMENT OF AGRICULTURE. 
follow the nervules beyond the cell, while a supplementary brownish and 
cblique line intervenes between the oblique portion of the costal stripe and 
the inner margining of the inner silvery band; the extreme outer margin of 
the wing has a black line on the upper half, and on the lower half at the 
nervule tips three or four black points; the fringe is silvery. Hind-wings 
uniform silvery gray, narrowly edged on the upper half of the outer border 
with pale brown, the fringe silvery white. Expanse of fore wings, ¢ 15™m™; 
9 17™m, Described from four bred males. 
The average length of 14 specimens, measuring from front of eye 
to tip of wing when folded, is 9.4 mm., or about three-eighths of an 
inch. The females are rounder of abdomen and average larger than 
the males. 
THE COCOON. 
The cocoon is composed of scraps of débris found on the floor of 
the bog, usually consisting of bits of dead leaves, bark, twigs, fine 
roots, grasses, sand, and dried’ excrement of the larva, with now and 
then a whole leaf attached loosely to the outside. This material is 
held together by fine strands of white silk, and the interior has a 
lining of white silk, parchmentlike in texture. In sandy locations 
the external part of the cocoon is sometimes made entirely of sand. 
However, for New Jersey bogs the typical cocoon is made of trash 
and appears dark brown in color. 
The shape of the cocoon is variable (Pl. VI, B.). In some in- 
stances 1t might be described as resembling in miniature a short- 
handled Indian club, while others appear of a curved cucumber 
shape. One end is always broadly rounded, being of greatest diame- 
ter about one-third the distance to the smaller end, and tapering 
to a cylindrical, slightly curved neck. Some loose strands of silk 
are placed in the neck for protection, but the end is not securely 
sealed as are the walls. When pupation occurs the pupa lies with 
head toward the neck, and the moth is able to push its way through, 
leaving the pupal shell within the cocoon. One can not tell from 
external appearances whether the moth has emerged, because the 
exit hole is well concealed by the arrangement of pieces of trash 
which tend to fall back into position after the passage of the moth. 
The measurements of 13 cocoons are as follows: Length 11 to 18 mm., 
average 13.84.; greatest breadth 5.5 to 10 mm., average 6.88 mm. 
Vertical cylindrical cases often encountered on cranberry bogs, 
which might be confused in the mind of the grower with those of 
the girdler, are those formed by larve of caddiceflies—harmless in- 
sects which breed in wet places. There are many styles of these 
caddicefly cases (Pl. VI, A), and they are often found projecting 
straight up through the trash in areas infested by the cranberry 
girdler. 
