338 



J. T. PATTERSON. 



their size within a fortnight. By the middle of July they have 

 reached their full growth, and are beginning to show signs of 

 undergoing pupation, which is evidenced by the construction of 

 the passage-way. The passage-way and its orifice differ in two 

 respects from those of G. gallcesolidaginis as described by Riley 

 ('69). The silk lining does not extend much beyond the lower 

 limits of the passage-way, and hence does not cover the inner 

 surface of the wall. The second difference is seen in the character 

 of the orifice and its silk plug. The caterpillar of G. salinaris 

 does not cut the passage-way quite through the wall, but leaves 

 the very thin epidermis of the stem, which is used as a back- 

 ground for the construction of the plug (Fig. 7). 



TABLE I. 



TABLE SHOWING DATES OF PUPATION AND EMERGENCE OF COPIDOSOMA AND 



GNORIMOSCHEMA. 



Pupation 

 (Beginning of) 



Emergence 



Copidosoma 



Gnorimoschema 



Copidosoma 



Gnorimoschema 



Pupation occurs during the last week of July and the first 

 week of August (Table I.). The imagines begin to emerge about 

 August 25, and continue to appear until September 10. The 

 moth has been seen flying in the open during this period. 



Females kept in captivity often lay eggs. This they do within 

 ten days after emerging, and irrespective of their association with 

 males. As a rule the moths simply drop the eggs on the bottom 

 of the cage, or they may lay them on the leaves and flowers of 

 goldenrods placed in the cage. At first it was thought that 

 G. salinaris must differ from G. gattcBsolidaginis in respect to 

 its egg-laying habits, for Riley states that the latter species 

 although emerging in the fall, hibernates as an imago and lays 



