6oo 



NEW YORK STATE MUSEUM 



D. S. Martin who took this species in its young and adult condition on the 

 leaves of buttonwood or sycamore. The adult has been described by Say 

 as follows : 



Whitish, reticulate with nervures on which are short spines ; widely 

 margined ; color whitish ; thorax with an inflated carina before, extending 

 over the head ; sides dilated, bullate, a little elevated, lateral and anterior 

 margins ciliate with short spines ; scutel with the lateral margin elevated 

 and an acute, highly elevated carina on the middle ; hemelytra dilated, with 

 an inflated carina before the middle of each, on which is a brown spot ; 

 edge ciliate with short spines, excepting the posterior third and tip, which 

 are unarmed, rectilinear; beneath piceous-black ; feet pale yellowish. 



Length to tip of hemelytra, 3/ 20 of an inch. 



The larva is spinous, fuscous, with a large yellowish spot each side of 

 the middle, and before the middle a broad yellowish vitta. The species is 

 very common. 



Bibliography 

 1888 Lintner, J. A. Ins. N. Y. 4th Rep't, p. 107-9 



Woolly maple leaf aphid 



Pemphigus acerifolii Riley ^ 

 Blackish or purplish, winged, woolly plant lice occur in large numbers on the under- 

 side of curled, soft maple leaves. 



This species is rarely abundant enough to excite attention, though 

 occasionally it is quite injurious, specially in the Southern States. Professor 

 Johnson has recorded instances of serious injuries to soft maples for several 

 years in succession, and in June 1905, this species was excessively abundant 

 on soft maples at several points in the Hudson' valley. It maybe easily 

 recognized by the large amount of woolly matter, it being sometimes nearly 

 as long as the insect. This form may be separated from the closely allied 

 Pemphigus a c e r i s Monell., which lives on the underside of hard maple 

 limbs, by the antennae reaching only to the wing insertion, whereas in this 

 last named the fourth joint extends to the base of the wings. This species 

 is sometimes excessively abundant on the underside of soft maple foliage in 

 June and the leaves may be badly curled as a result. The insects usually 

 desert the trees early in July and as a rule remedial measures are unnecessary. 



