34 



BULLETIN 351, U. S. DEPARTMENT OF AGRICULTURE. 



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 31 to September 2 was 



A\ UGUST 



C O) o n 

 r\j cvj O) 0) 



vS EPTEMBER 



<\j 05 > «0 <0 



N OD o> 5 



(V, 0) ^ 



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to <o 



AGE 

 — SO 



N(D0)O\ ( \|t , )^ l ( oNQ)(J)ON(\|0)4l0<0 



Cry 0>(*)4^4^^^^4^>^W)W)tOW)V0W)lO 



« 60 

 4-0 



k 











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1 





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20 



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1 







i 



/ 

 \ i 









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7 





























6 



6 















4- 



3 



2 





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^-;^ ...^.,--^ 



ni <*: >4 ^ -J ^ -J 



Fig. 10.— Curve of the twigward migration of the 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. 



