282 ENTOMOLOGICAL NEWS. [Jvuie, '17 



care and disposal of garbage. Insanitary privies also permitted 

 the breeding of Fannia scalaris and other coprophagous flies in 

 much greater number than would have been the case if privies 

 had been fly-proof. The species of Sarcophagidae, which 

 were more numerous than the data indicate, are also far more 

 numerous under rural and semi-rural conditions. It will be 

 seen from the table that Muscina stahnlans was second in 

 abundance and showed a continual decrease during the sum- 

 mer months. In the spring it is frequently more commonly 

 seen in houses than Musca domestica. The species of Lucilia, 

 CalUphora and Fannia also show a decrease in numbers during 

 the period of the experiment, though all show some increase 

 early in August. Phormia regina remained about constant. 

 It is uncertain just how accurate an index of the comparative 

 abundance of the various species is afforded by the data pre- 

 sented. The beer used for bait was doubtless more attrac- 

 tive to some species than to others. 



As noted at Powderville, Montana, during the season of 

 T916, blow flies were most abundant during the spring. Phor- 

 mia terraenovac and a species of Cynomyia, probably elongata 

 Hough, were predominant during the spring months and were 

 followed by species of CalUphora. Phormia regina and Cal- 

 Uphora coloradensis were the more common species in July 

 and August. A knowledge of the seasonal occurrence of the 

 blow flies is likely to be of some value in connection with the 

 blowing of wool at lambing time though at present the species 

 of these flies responsible for this trouble in Montana are not 

 known. 



Change of Address. 



Dr. Edwin C. Van Dyke, of the Entomological Department of the 

 College of Agriculture of the University of California, will exchange 

 positions temporarily with Dr. J. C. Bradley, of Cornell University. 

 Dr. Van Dyke will leave Berkeley on June i, 1917, and his address 

 from June 18, 1917, to February i, 1918, will be Department of En- 

 tomology, Cornell University, Ithaca, New York. 



