No. 4.] GYPSY MOTH APPENDIX. 477 



pcndiculatc claw, which has a single opposing spine near the base. 

 Tarsal spines short, simple. The clusters of spines on the sides 

 of the abdomen when highly magnified are similar in structure to 

 those on the femur. 



When the time for pupation arrives, the larva shortens and 

 thickens (one specimen measured 3.8 mm. in length and 2 mm. in 

 width). The integument is then ruptured along the dorsal line of 

 the whole body, the pupa remaining within the exuviai until ready 

 to emerge. A pupa removed from one of these cases soon after 

 pupating was pale yellow in color, broadly oval in form, and 

 measured 3.2 mm. lomjr and 1.6 mm. wide. 



