44 Agricultural Experiment Station, Ithaoa, IST. Y. 



In 1891, we also had a similar experience to that recorded by Dr. 

 Linter above. Larvae which hatched in the latter part of June, 

 attained such a growth by July 20, that it seemi'd as if they must 

 become full grown before fall. All had disappeared, however, by 

 August 1, and were supposed to have died. 



Further observations were made upon this point in 1892. The eggs 

 obtained from moths confined in cages hatched July 1 1 ; and the larvae 

 were given every chance to grow in our cages and on trees in the field. 

 These larvie had moulted the third time by July 28, after which they 

 fed but very little. On August 2, one of the larvoe in the cage had 

 left its tube and leaf. It was found in a minute, closely woven, silken 

 case constructed in a slight groove by the larva in the bark of the 

 twig; the bark presenting no angular places, the larva had cut one. 

 The outside of the cocoon was completely covered with little particles 

 of bark and dirt, thus rendering it a very inconspicuous object. These 

 hibernacula are but little more than an eighth of an inch in length and 

 just large enough to hold the somewhat contracted body of the little 

 larva. They are always made ou the twigs and smaller branches, and 

 usually quite near a bud. Figure 8 represents a twig natural size 

 bearing three hibernacula at a and b. By the middle of August most 



Fig. 8.— Twig showing the position of the winter homes 

 of the larvae at o, a, and 6, natural size. 



of the larvje both in the cages and in the field had gone into hibernation. 

 Frequentythe hibernacula were made under some convenient piece of 

 dead leaf or bud scale {b, Fig. 9) which had haj)pened to lodge on the 

 bark of the tree. The bit of leaf or scale would be firmly fastened to 

 the branch by the silken case underneath Some of the larv:e which 

 were of the same brood as those which went into hibernation early in 

 August, did not leave their tubes until September 1. But none 

 remained in the tubes when the leaves fell in autumn. 



These observations leave but little doubt that the larva? cease feed- 

 ing on the leaves ^oon after the third moult; a few may moult the 

 fourth time, and some of them immediately go into hibernation while 

 others wait until later, but none remain upon the leaves during the 



