INSECTS AFFECTIXG PARK AND WOODLAND TREES 



179 



This form reseniljles the iircccdint; vcrv much. 



naria acericola: ,i-l 

 female with tarsus and antenna at right, g 

 on lower side of leaf, before migrating 

 U. S. Dep't Agric. Div. Ent. IJul. 22, i 



f third stage of early hiber 



y enlarged; i^=larva of third stage 



twigs, enlarged. (After Howard. 



1900) 



Maple leaf scale 

 Pulz'i)iaria accricola \\ alsh & Riley 

 Brownish scales, witii cottony masses protruding from under them may be found on 

 the leaves of the sugar majd 

 This species, as 

 pointed out by I)r 



Howard, was probably 

 observed by Dr S. IS. 

 Rathvon at Lancaster 

 Pa., at tht' time he 

 studied ami character- 

 ized P u 1 \- i n a r i a 

 i n n u 111 e r a b i 1 i s . 

 It was figured by Walsh 

 and Riley in the first 

 volume of the American Entoiuologist, and by later writers it was referred 

 to Dr Rathvon's species. It was left to Dr Howard to point out in 1S98 

 that two species had been confounded and that the very characteristic illus- 

 tration published by Messrs Walsh and Riley was sufficient to carry the 

 name. 



Description. The adult female, found on the leaves as described by Dr 

 Howard, is not so large as the corresponding stage of P. innumer- 

 abilis Rathv. and the secreted cottony mass is somewhat depressed, 

 faintly bilobed and transversly undulated. This species has been taken 

 only on the sugar maide and in this State it has been recorded from Ithaca. 

 It is also known to occur in Iowa, .-\laf)ama, Washington I). C. and New 

 Jersey. The paucity of records is probably due in part at least to its being 

 confused with our more common species. 



Life history and habits. The following account of the life history and 

 habits of this species is based on Dr Howard's work. Eggs received from 

 Knoxville Tenn. in 1898, began to hatch in June, while others from 



