1916] The Sleep of Insects 257 



Atalopedes huron Edwards [G. T. Hosenfelt]. 



A good many of these butterflies were at rest on cedar and 

 other trees at 8:30 p. m. and still the following morning at 6 

 a. m. At both times they would promptly fly away when 

 touched, but they did not appear in the least disturbed by my 

 carbide light. On two nights, August 19 and 20, they behaved 

 in the same manner, so I do not know whether they were 

 sleeping lightly or only resting. 



MOTHS. 

 HjTphantria cunea Drury [G. T. Hosenfelt]. 



This species seems to sleep, or at least relax for a night's 

 rest, in any spot convenient at the moment and without any 

 regular manner or formality. We have found them resting 

 after 7 or 8 o'clock upon a variety of vegetation — grass, sun- 

 flowers or weeds. However, they may not confine their rest 

 to the night hours, for we came suddenly upon one which 

 seemed to be asleep in the middle of an afternoon in September. 



On September 24 I found seven of this species asleep on 

 various plants in a field on a hill-side. It is interesting to note 

 that every one of the seven rested directly facing the wind. 



When picked up at night they often struggle clumsily to 

 free themselves. 



Haemorrhagia tenuis Grote [G. T. Hosenfelt]. 



Only one specimen of this species has been taken while 

 asleep. At Lake View, Kansas, on August 20, at 8:10 p. m. one 

 was found sleeping on a cedar twig five feet from the ground. 

 Neither the strong light nor my carrying it about on my finger 

 disturbed it in the least or aroused its resistance. 



Hsematopsis grataria Fab. [G. T. Hosenfelt]. 



On the evening of August 19 many of these small yellow 

 Lepidoptera were on the plants, some in copulo, but they were 

 evidently only resting for they were agile in making their 

 escape when we tried to take them. 



