22 BUTTERFLIES 



the hibernating period. This phase of butterfly existence 

 has not been extensively studied and there are indications 

 that it exists more generally than has been commonly sup- 

 posed. It has been noticed even in northern New England 

 that some of the Angle-wings seek shelter and become 

 lethargic during August. Apparently this is an adaptation 

 to single broodedness, helping to carry the species through 

 the year without the exhaustion incident to the con- 

 tinued activity of the butterfly. 



In more southern regions, especially in the hot, dry 

 climates where vegetation withers in midsummer, it is well 

 known that some caterpillars become lethargic, remain- 

 ing inactive until the fall rains start vegetation into 

 growth. The Orange-sulphur butterfly is a good example 

 of this. 



This summer lethargy offers excellent opportunity for 

 careful study. Any observer who finds a butterfly hidden 

 away in summer under boards, the bark of a tree, or in a 

 stone pile should look carefully to see what species it is and 

 how the butterfly behaves. Such observations should be 

 sent to the entomological journals in order that our knowl- 

 edge of the subject may be increased. 



Feigning Death 



The fact has long been noticed that various butterflies 

 have the habit at times of feigning death and dropping to 

 the ground where they may lie motionless for a consider- 

 able period. This habit is most easily observed in some of 

 the Anp-le-wings, especially those which hibernate as 

 adults. Those species have the under surfaces of their 

 wings colored in various bark-picturing patterns and ap- 



