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in some oats fields were parasitized. The junior author spent some 
time in northern Texas during November and December, 1904, 
Diagram IV. — Map of the United States east of the Rocky Mountains, showing normal temperature, 
upper line, and departure therefrom, lower line (+, above normal, and — , below), for the critical period 
December, 1902, to May, 19C3; above normal (+) in winter and below normal (— ) in spring being 
favorable for outbreak of spring gram-aphis. (Original.) 
investigating insects in the fields of wheat and oats without finding 
the pest. He was not looking for this species particularly, and it 
was doubtless still present in very limited numbers. 
