10 



Second generation. — The majority of tlie progeny of these stem-mothers reach 

 maturity (hiring the first half of May, almost all of which acquire wings, to enable 

 them to spread from tree to tree or from one locality to another, for the preservation 

 of the species, as otherwise they are liable to extermination by various enemies, 

 which gradually increase in numbers and species. 



The pupte measure about 1.8""" in length, and are of a more or less translucent. 



Fig. 1. — Siphncnryne avcnpr Fab.: a, migratory female; h, sexual female; c, antenna of migratory 

 female; d, side view of end of body of winged male; e, under side of end of body of male; /, under 

 side of end of body of sexual female; all greatly enlarged (original). 



pale, greenish-yellow color, marked with three darker green stripes, which are linear 

 on the thorax and much the broadest on the abdomen. The head, four basal joints 

 of the antennpe, the wing-pads, and nectaries are whitish, often with a greenish 

 or yellowish tinge; frequently there is also a reddish or ferruginous patch near the 

 inner base of the nectaries; the future ocelli are indicated by brownish spots. The 



