28 



THE SPEIXG GEAIX-APHIS OR " GEEEX BUG." 



this bureau, as attacking fall oats. During tins month in Texas east 

 of a line drawn from near 



Gainesville through Abilene and San 



Diagram V.— Map of the "diked 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, 1906, to May, 1907; above normal (+) in winter and below normal (-) in spring being 

 favorable for outbreak of spring grain-aphis. (Original.) 



Antonio to Galveston the temperature -was 9° F., above the normal. 

 Within this area was a smaller one, the boundaries of which may be 

 indicated bv a line drawn from Texarkana to Fort Worth. Waco, and 





