LARCH CHEATER ITS COCOON AND PUPA. 265 



distance, there being no self-planted trees of this kind within a 

 circuit of several miles. The first moth came from these cocoons 

 upon the twenty-fourth of July and the others hatched soon after. 

 The mature larva was 1.38 long and about 0.25 broad when in repose. It 

 was of a very dull umber brown color, resembling that of the old rough bark 

 upon the body of the tree; its extremities were of an ash-gray tinge and upon 

 each side of the fifth segment was a cloud of the same color. Under a lens 

 some short, wavy, black streaks were perceptible upon the surface. Along the 

 back were little projecting points with rounded summits, one on each side of 

 the middle of each segment, those upon the ninth segment larger and of a paler 

 color, and with a small pale yellowish spot forward of their bases. The lap- 

 pets and hairs upon the sides were the same as in the younger worm. Many of. 

 the white hairs were dilated at their ends into flat triangular heads, ciliated or 

 fringed at their tips. The under side of the body was naked and pale bluish 

 green. 



The cocoon is of an ash-gray color, of the identical hue of the 

 bark of the smaller limbs to which it is attached, lengthwise. 

 It is an inch and a quarter in length, 0.30 broad, flattened and 

 moulded to the limb and partly surrounding it, its middle ris- 

 ing 0.20 or less than a quarter of an inch in height, forming 

 merely a slight bulge upon the limb, which is only observed upon 

 a particular search. Some wrinkles lengthwise at its ends and 

 sides may also be seen, similar to those of the adjacent bark; and 

 on its surface here and there is a little blackish wart-like spot, 

 placed transversely, closely counterfeiting the glands upon the 

 bark, and also minute blackish points, resembling the pores in 

 the bark. It is of a tough texture with a roughish surface, very 

 similar in appearance to the pale gray wrapping paper which 

 was formerly in common use among grocers and shop men. 

 Woven into its surface is an occasional hair derived from the 

 body of the caterpillar. Its inner surface is smooth and of a 

 paler gray color than exteriorly. The naked bark of the limb 

 forms the floor of the cavity within. And the moth makes its 

 exit by crowding itself forward and thus separating one end of 

 the cocoon from its slight attachment to the bark. 



The pupa is 0.60 long and 0.25 wide, slightly depressed, 

 rather broadest across the middle, and tapered to a point 

 abruptly, with a very minute tooth standing outward upon each 

 side of -its apex. Its relics are of a chestnut brown color, the 

 sheaths of the wings and legs paler and yellowish. 



