DISTIJIIU TION. 



Outside of America the Hessian fly occurs in North Africa, western 

 Asia, fLurope. British Islands, and New Zealand. In the Dominion of 

 Canada Doctor Fletcher has found it from Prince Edward Island to 

 Indian Head, Saskatchewan. On the Pacitic coast it probably occurs 

 from southern California to British Columbia; but as no exact investi- 

 gations have been made there, this statement is to be considered as 

 onl}' approximatel}^ correct. 



Our previous notions of the distribution of this insect over the 

 country east of the Rock}' Mountains will have to be revised. The 

 accompanying map (fig-. 8) will show the extent to which this revision 

 becomes necessary. The original of this map appears in Bulletin It), 



Fig. 8. — Map showing distribution of tlie Hessian fly in America (altered from Osborn). 



new series, of this Bureau (issued in 1899). The heavy l»roken line 

 indicates the present western and southern limits of Hessian fly dis- 

 tribution based on our latest o))servations and data furnished l)v Pro- 

 fessor Bruner, of Nebraska, and Mr. R. I. Smith, entomologist of the 

 (leorgia State crop pest conuuission. This is believed to be ap})roxi- 

 mately correct. It also seems to show that the insect nuist have been 

 flrst introduced into the Pacific coast region in or with articles of 

 inland commerce, and (unless it be found to infest native grasses) that 

 it did not reach there l>y natural difl'usion, a point that has not before 

 been deflnitely stated so as to be clearly understood. 



Experimental sowings of wheat near Sault Ste. Marie. Mich., dur- 

 ing the last two vears do not reveal its presence there, and no attempt 



