374 TJf.pokt of thk DF.PAin'MKXT OF Entomol()(;v of the 



feeds chiefly on the species and Vcarieties of grapes having thick 

 leaves with the under sides covered vi^ith pubescence. Vitis hicolor 

 Le Conte (the summer or blue grape) is the most common species 

 of wild grape in Chautauqua county. It has thick leaves with a 

 downy under surface and it is a common occurrence to find 

 T. comes breeding upon it. The varieties of cultivated grapes upon 

 which T. conies has been observed breeding are as follows: 



Severely infested and badly injured : Agawam, Brilliant, Camp- 

 bell Early, Catawba, Concord, Delaware, Goff, Herbert, lona, 

 Lindley, Mills, Regal, Salem, Winchell and Worden. 



Badly infested but not as severely injured as the preceding: 

 Brighton, Jefferson, Niagara, JSI'oah, Vergennes and Wilder. 



Seldom infested : Bacchus, Clevener and Clinton. 



It will be noted that two thin, smooth-leaved varieties. Dela- 

 ware and Winchell, are included in this list, but all the others are 

 varieties having pubescence on the under surfaces of the leaves, 

 which are thick or moderately thick. 



T tricincta breeds on Vitis vulpina L. (the frost or riverbank 

 grape) a thin-leaved species of wild grape that is found occasion- 

 ally in Chautauqua county. It also breeds on the following varie- 

 ties of cultivated grapes : 



Very abundant: Bacchus, Clevener, Clinton and Gloire. 



Few to one-half the number present (the other being T. comes) : 

 Agawam, Brighton, Brilliant, Delaware, Herbert, lona, Lindley, 

 Mills, Salem, Vergennes and Wilder. 



The tendency of this species to select smooth-leaved varieties is 

 showm, but it should also be noted that it breeds on some of the 

 varieties in common with T. comes. It, however, has never been 

 seen by the author breeding on the following varieties : Campbell 

 Early, Catawba, Concord, Goff, Jefferson, ISTiagara, Xoah, Regal, 

 Winchell or Worden, all of which have pubescence on the under 

 surfaces of the leaves. 



During the warmer days of the hibernating period both species 

 feed on various weeds and green plants. Timothy and blue grass 

 afford favorite harbors for them. 



