1934 ] 
A Psychid New to North America 
23 
the close resemblance of their cases to the surroundings, the 
cases attached for pupation are conspicuous and often ren- 
der unsightly the objects of attachment. 
Pupa. Like the larval period, the pupal period is passed 
within the bag. After firmly attaching the bag and closing 
its anterior end in preparation for pupation, the larva re- 
verses its position within the bag so that its head comes to 
lie at what was previously the bag's posterior opening. 
Rarely, the larva fails to reverse its position, but in such 
instances the adult is unable to escape from the bag and 
perishes within it. 
The pupae of the two sexes are quite different in appear- 
ance. That of the male measures from 4.5 to 5 mm. in 
length, and has the general appearance of orthodox moth 
pupse. That of the female measures 5.3 to 7.5 mm. in 
length, and is noteworthy because of the marked reduction 
in size of the antennae, wings, and legs, all of which occupy 
a very limited area of the anteroinferior portion of the 
pupa. 
In both sexes, when the pupa is ready to yield the imago, 
it squirms forward in the bag until the head of the pupa 
projects from the bag’s opening; in the male this squirm- 
ing continues beyond the stopping place in the female, until 
not only the head projects, but also the thorax and three to 
five segments of the abdomen. In this position the adult 
emerges. 
The duration of the pupal period is about twelve days in 
the male, and about seven days in the female. 
Adult Male. (Plate 2, figs. C and F.) The male moth is 
uniformly dark brown in color, and is provided with strong 
wings to which the scales are loosely attached. The alar 
expanse varies from 10.5 to 13 mm. (Chapman and Tutt 
give measurements of 9-15 mm. for European casta.) No 
food is taken by the adult, and the duration of life is but a 
very few days at most. 
Adult Female. (Plate 2, figs. A and B.) In the higher 
Psychidae, to which all the North American Psychids be- 
long with the exception of Solenobia walshella Clem., the 
females are maggot-like and devoid of antennae, eyes, and 
legs. In the lower or less specialized Psychidae, the females 
