I 



636 NEW YORK STATE MUSEUM 



around the gall though occasionally it is smaller. The interior of the 

 inhabited gall is crowded with plant 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 of 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. 11, fig. 15, 16] 

 * Basal leaf gall 



Pemphigus populicaulis Fitch 



Imperfect, globular galls ^ to nearly ^ inch 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 



RhabdopJiaga rigidac O. S. 

 Purplish, fusiform galls ^ to 1 inch in length are common 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 

 flies appearing the following May. 



Willow apple gall 



Pont a uia ponium Walsh. 



A smooth, globular, or slightly oval rosy cheeked gall, like a miniature apple, measur- 

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

 Salix cordata. 



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

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

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



The gall S. p o m u m is found on Salix cordata and very rarely 



