Number of flies 
(t. S. CtRAHAM-SmITH 
453 
April May June 
Chart 1. Showing in upper part the numbers of C. erythrocephala, F. scalaris, H. dentipes 
and M. stabulans emerging daily from “ winter ” pupae, and the daily mean temperature 
in “Tin I” in the shade. In the lower part the numbers of F. manicata, C. erytkro- 
cephala and 0. leucostoma emerging daily from the ground in the large outdoor cages 
are shown. The upper dotted line indicates the daily temperature of the ground at 
a depth of one foot in the open, the lower dotted line the daily temperature at 
a depth of one foot hi the shade, the thick line the daily mean temperature at a 
depth of two inches in a partially shaded situation, and the thin line the daily mean 
temperature on the surface of the ground in the outdoor cage. 
