292 Agricultural Experiment Station, Ithaca, N. Y. 



Nearly seven mouths of the insect's life is spent in idleness in 

 these snug, curved cases on the twigs of the trees. 



Appearance and Habits in the Spring. — The little caterpillars 

 awake from their long winter's fast early in the spring, as soon as 

 the buds begin to open. In 1894:, the little cases were loosened 

 from the twigs about April 15th, and the march of the hungry 

 caterpillars for the buds began ; on April 25th we saw hundreds of 

 thera on pear buds near Rochester. Their manner of working on 

 the buds has been described on page 289. 



As the caterpillars continue feeding on the expanding foliage 

 they soon find that their winter suits or cases are too short for their 

 growing bodies ; and they proceed to build on extensions at one 



60.— The winter cases, with their spring additions ; much enlarged. 



end. In Fig. 60 are shown, considerably magnified, two of these 

 enlarged spring suits or cases ; from one, the head of the caterpillar 

 projects. The smoother portions of the cases in the figure repre- 

 sent the winter suits. The portions added in the spring are much 

 rougher, apparently consisting of bits of the fuzzy skin qf the young 

 leaves glued together ; in many cases this added portion is nearly as 

 long as the original winter case. 



However, the little caterpillars increase in size so fast in the 

 spring, that by the middle of May most of them" find their spring 

 suits entirely inadequate for their wants. Then their tailoring 

 instinct again asserts itself and they proceed to construct their 

 second and last suit or case. 



The Construction of its Cigar-shaped Suit or Case. — In the con- 

 struction of this, its summer suit, the caterpillar illustrates in a 

 very interesting manner the instinctive powers of insects. We 

 were fortunate enough to catch one of the little tailors at work on 



