18 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. GO. 



Cocoon. — The cocoon is a semitransparent, whitish to pale brown, 

 thin walled cell; 7 mm. long by 3 mm. wide, irregularly oval. It 

 seems to consist of several layers, one complete inner envelope and 

 two or three partial outer envelopes that serve as further protection 

 and at the same time attach more firmly the inner case to the leaf 

 upon which it is spun. 



Pupa. — Pale yellow white, length 6 mm. (alcoholic specimen) ; 

 living specimen described as grayish green; the thorax and end of 

 body slightly yellowish; head whitish green; ocelli brown; eyes 

 black; antennae, wing sheaths and legs white, with a slight green 

 tinge. Darkened pupa, 6 mm. long; head and thorax black, except- 

 ing legs and wing pad, which are yellow ; abdomen dark brown. 



LIFE AND SEASONAL HISTOBY. 



The studies which furnished information on the stages likewise 

 afforded an opportunity for observations to be made on the length 

 of the various stages and periods. Observations of this character 

 could hardly be made under natural conditions because the variation 

 in emergence of overwintering adults, coupled with the difference 

 in length of life under varying conditions, makes it but a short while 

 before all forms of the insect, especially all stages of the larvae, 

 may be found in the rose garden at the same time. 



The following table is summary of the notes made upon the length 

 of the various periods and stages of eleven larvae of the second 

 generation. These larvae were under close observation during their 

 entire life, and since comparisons indicate that the life-cycle of the 

 preceding and succeeding generations (excepting the resting stage 

 of the overwintering generation, which is longer) is approximately 

 the same, the table will serve to represent the average (in days). 



Table II. 



* Larva died. 



