WHEAT THRIPS — THREE-BANDED THRIPS. 309 



smoky brown, with three broad white bands, whereof one is upon 

 the base, another across the middle, and the third, which is 

 somewhat narrower, upon the tip. The wings show two longi- 

 tudinal veins, but no transverse ones were noticed upon them, 

 nor could I discover any fringe upon either their outer or inner 

 margin. The fore legs are larger than the others, and the 

 antennae (see figure g of the preceeding cut, representing the head, 

 eyes, left antenna and base of the right) instead of arising far 

 apart as in most of the species I have examined, come out from 

 the front of the head close together, and are composed of only 

 five principal joints, of which the two first are short, and a third 

 thicker than the others, which are long and cylindrical, the last 

 one gradually tapering to a slender point, its apical portion being 

 divided into small indistinct segments. 



This species is common upon wheat as early as the first of 

 June. When the grain ripens it probably forsakes it and becomes 

 dispersed upon plants which flower later in the season; for I 

 have met with it upon flowers of tanzy (Tanacetum vulgar e) the 

 last of July. 



