636 NEW YORK STATE MUSEUM 



around the gall thoui^h occasionally it is smaller. The interior of the 

 inhabited gall is crowded with i)lant lice, they being sometimes so abundant 

 as to literally stand on their heads in attempting to obtain nourishment 

 from the succulent walls. The mealy white powder, cast shriveled skins 

 and globules of honeydew are also characteristic features ol this insect's 

 retreat. This species has been very abundant in the vicinity of Albany in 

 recent years and was the occasion of a brief note by Dr Lintner in 1897. 

 [See pi. 1 1, fig. 15, 16] 



Basal leaf gall 

 PenipJiigiis popiiliiaitlis Fitch 



Imperfect, globular galls ){ to nearly ]'z incii in diameter, occur in June at the base 

 of Cottonwood leaves. 



These little galls at the very base of the leaf are somewhat irregular 

 in size and shape and otherwise closely resemble the preceding species. 

 This insect was described by Dr Fitch in 1858, at which time it was very 

 abundant in Albany and attracted much notice. 



Willow club gall 



Rhabdophaga rigidac O. .S. 

 Purplish, fusiform galls i/^ to i inch in length are cominon on or near 

 the tips of low willow shoots. This gall is quite abundant at Karner, the 

 large, pale orange- larva wintering in a central channel within the gall, the 

 fiies appearing the following Max. 



Willow apple gall 

 Poutaiiia poiii/tui Walsh. 



A smooth, globular, or slightly "val rosy clieeked gall, like a miniature appje, measur- 

 ing from .3 to .55 ini h may be found growing on one side of the midrib of the leaf of 

 S a 1 i X c o r d a t a. 



This species is rather common in certain localities, and on opening the 

 gall a i)ale greenish white larva with a pale brown head may be found 

 within. The gall has been desribed by Walsh as follows : 



The eall S. n o m u m is found on S a 1 i .x c o r d a t a and very rarely 



