1932 ] 
The Olfactory Responses of Blowflies 
149 
the temperature of metabolic optimum that humidity has 
much effect on their olfactory responses. At that tempera- 
ture, the optimum for humidity is 73%. 
It is a pleasure to thank Dr. C. H. Kennedy, Dr. W. M. 
Barrows, and Dr. D. F. Miller for many suggestions, ma- 
terials, and aid in carrying this problem to a successful 
conclusion. 
LITERATURE CITED 
Beattie, M. F. V. 1928. Bui. Ent. Research, 18, 397-403 
Hamilton, C. C. 1917. Biol. Bui., 32, 159-177 
Headlee, T. J. 1917. Jour. Econ. Ent., 10, 31-38 
Herter, K. 1923. Biol. Zentbl., U3, 282-285 
Kennedy, C. H. 1927. Ann. Ent. Soc. Amer., 20, 87-106 
Lodge, Olive C. 1918. Bui. Ent. Research, 9, 141-151 
Marchand, W. 1920. Ent. News, 31, 159-161 
Miller, D. F. and M. Gan 1926. Jour. Compar. Psychol. 
Miller, D. F. 1930. Jour. Econ. Ent., 23, 945-955 
Shelford, V. E. 1913. Biol. Bui., 25, 79-120 
