128 SEASONAL CHANGES AND HISTORIES. 



winter's cold. It may then be easily imagined 

 what complications of habits and histories are 

 possible in the butterfly world, when the winter 

 may be passed at any (though generally at a 

 fixed) period of life, and when a species may be 

 single-brooded, or may twice or thrice run the 

 circle of its transformations within a single year. 

 When, moreover, we recognize that these frequent 

 repetitions of the cycle are largely due to temper- 

 ature, and therefore vary to a certain extent with 



the latitude and even 

 with the season, we can 

 understand how nearly 

 every variation we can 

 conjecture finds its coun- 

 terpart in the actual his- 



FIG. 122.-Thecla Calanus, nat. tones of OUr OWU but- 

 size ; under surface on left. ... ._ TT ...., 



terflies. We will recite a 

 few cases, each illustrating some peculiarity. 



The Banded Hair-streak (Thecla Calanus) [Fig. 

 122] appears on the wing during July and lays 

 its eggs toward the end of that month and early 

 in August ; these eggs remain unhatched until the 

 following spring, when the caterpillar emerges, 

 feeds on oak-leaves, changes to chrysalis in 

 June and July, and after a fortnight the butter- 

 flies of the new year appear. 



The Bronze Copper (Chrysophanus Thoe) [see 

 Fig. 117] also hibernates in the egg state, and 



