42 THE ROYAL SOCIETY OF CANADA 



which had taken a meal lasting 8^ minutes, fed again when an op- 

 portunity was offered 18 hours later. They will usually feed readily, 

 should the opprotunity occur, after a period of forty-eight hours since 

 their former meal. How long, under natural conditions, they can 

 exist without feeding has not been determined, but under experi- 

 mental conditions a fly was very active 125 hours after feeding, the 

 previous meal having taken 72 hours to digest. Provided they have 

 access to moisture, which they will absorb readily, they will no doubt 

 live many days without food. 



References. 



Bishopp, F. C. The Stable Fly. Farmers' Bulletin No. 540, U.S. 

 Dept. Agric, 28 pp., 10 figs. 1913. 



Mitzmain, M. B. The Bionomics of Stomoxys calcitrans Linnaeus. 

 A Preliminary Account. Phillipine Joum. of Science, 

 vol. 8, No. 1, Sec. B. pp. 29-48. 1913. 



Portchinsky, J. A. Récherches biologiques sur le Stomoxys cal- 

 citrans L. et biologie comparée des mouches copro- 

 phagues. (In Russian). Publications of the Entom. 

 Bur. of the Russian Dept. of Agric, vol. 8, No. 8, 91 pp., 

 97 figs., 1 pi., 1910. Abstract in Rev. Applied Entom., 

 vol. 1, Ser. B, pp. 146-148, 1913. 



Stephens, J. W. W. and Newstead, R. The Anatomy of the Pro- 

 boscis of the Biting Flies. Ann. Trop. Med. and Par- 

 asitology, vol. 1, No. 2, pp. 171-182, 8 pis. 1907. 



