34 



BULLETIN" 351^ U. S. DEPARTMENT OF AGEICULTUEE. 



also includes the data for rainy and clear days. August 28 was 

 clear and favorable and the following day was rainy. August 30 

 was clear, and migration started. August 3 1 to September 2 was 



AUGUST S EPTEMBER 



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Fig. 10.— Curve of the twigward migration of ttie terrapin scale for a rearing that emerged July 22, 1912. 



(Original.) 



rainy, but on the last of these days it was clear and hot in the after- 

 noon, thus permitting a heavy migration. The remainder of the 

 period was clear, except for slight rains upon September 3 and 7. 



