22 



at which time I concluded them to be different from the other grain 

 lice though possibly related to, but quite different from, Siphonophora 

 fragariae, Koch. The following year it was again found on straw- 

 berries during November at Washington and very numerous in June, 

 189-1, on the stems of red clover and on the stems of the common sow- 

 thistle {Sonchus oleraceus). During the same month this species was 

 also observed to be very common on red clover at Cadet, Mo., and on 

 the leaves of dandelion (Taraxacum dens-leonis) at Washington. In 



Fig. 4. — Macrosiphum trifolii Perg., n. sp.: migratory female; much enlarged (original). 



April, 1900, it was reported as being very numerous on red clover at 

 Charlottesville, Va., and in June on oat at Wooster, Ohio. 



While investigating the specimens found on strawberries it occurred 

 to me that they might possibly be identical with the species briefly 

 described by Riley, under the name of Siphonophora fragariae, var. 

 immacidata, in the Rural World, for December, 1875, found on this 

 plant at Kansas City, Mo.; but, after an examination of the few 

 poorly preserved specimens, I found them to be different, and, since 



