16 



The list of grains and grasses on which it has thus far been observed 

 is rather small, though there can be no doubt that it will eventually 

 be found to subsist on many other grasses and possibly also on some 

 weeds or other cultivated plants. 



That it must have existed in this country for a considerable length 

 of time seems evident from the fact that its distribution has spread 

 from Virginia to North Dakota, and that it will gradually be found in 

 all the intervening States both north and south, as well as in the 

 Western States or wherever wheat or other grains are grown, where 

 occasionally it may prove a serious pest. 



Macrosiphufn granaria Buekton: a, migratory female; b, third antennal joint of same, all 

 greatly enlarged (original). 



DESCRIPTION OF THE SPECIES. 



Apterous fema It.— Length 2.4 to 2.8 mni ; fusiform, broadest near the hase of the 

 abdomen. Frontal tubercles large, diverging at the apex, as usual, in this genus; 

 antenme bristle-shaped, as long or slightly longer than the abdomen; joint six, 

 including the spur, longer than joint three; generally there are one or two small, 

 circular and projecting sensoria near the base of the third joint; all of the joints are 

 very sparsely beset with short and stiff bristles which are rarely slightly clavate. The 



