50 Psyche [February 
out comes the head of the moth. In an instant the legs are thrust 
out, and then the whole body appears; not a fibre has been broken, 
they have only been separated.” 
The cocoons of Samia cecropia and Callosamia promethea do not 
have a gummy coating over the entire interior. In each case the 
end through which the moth emerges is composed of silken fibres 
loosely pulled together and not covered with a gummy substance. 
It is as if each layer of the cocoon was spun into a fringe at this 
end, the fringes of all layers being bunched together forming a 
little cone. In the cocoon of Samia cecropia, it was possible to 
push a pencil through this fringe with apparently no effort. The 
fibres parted readily, it being necessary to break only a few in the 
extreme outside layer. The same can be said of C. promethea’s 
cocoon. i 
This condition of affairs evidently enables the emerging insect 
to escape, without the aid of secretions or cutting apparatus, the 
struggles evidently helping considerably to enlarge the opening. 
It is rather strange how few text-books on entomology mention 
this method of emergence. 
SITOWSKIT’S NEW ABERRATION OF COLIAS HYALE L. 
By P. W. Wauitina. 
Bussey Institution, Harvard University. 
In the Bulletin de L’ Academie des Sciences de Cracovie for May, 
1913, L. Sitowski figures and describes an aberrant form of Colias 
hyale L. to which he gives the name polonica. The example, a 
male, was taken at Radlow in Galizia and appears to be different 
from any of the forms hitherto described. Besides minor differ- 
ences of color distinguishing the aberration from the parental 
form, there is a great extension of the dark border on the upper 
side of the primaries into the disk, and an entire absence of the 
border on the upper side of the secondaries. A suffusion of 
dark scales over the light areas distinguishes the under sides of 
the wings from the type. 
The scales of the wings are strikingly different from the normal, 
lacking altogether the apical processes and being smoothly rounded 
off instead. The scent-scales at the bases of the hind wings 
