INSECTS AFFECTING PARK AND WOODLAND TREES 



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Pull 



r i ;i a c tf r i c o 1 a : rt=Iarva Lif third stage of early hibernating 

 female with tarsus and antenna at right, greatly enlarged ; iS— larva of third staEc 

 on lower side of leaf, before migrating to twigs, enlarged. (After Howard, 

 U. S. Dcp't Agric. Div. Ent. Bui. 22, n. s. 1900) 



Maple leaf scale 



Piilvi)taria aco-icola \\';il,sh & Riley 



Brownish scales, with cottony masses protruding Irom under them may be found on 

 the leaves of the sugar maple. This form resembles the preceding very much. 



This species, as 

 pointed out b)- I)r 

 Howard, was jirobalih' 

 observed b\- Dr S. S. 

 Rathvon at Lancaster 

 Pa., at the time he 

 studied and character- 

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

 i n n 11 ni e r a b i 1 i s . 

 It was figured by Walsh 

 and Riley in the first 

 volume of the America)! Eiihviioloi^isf, and by later writers it was referred 

 to Dr Rathvon's species. It was left to Dr Howard to point out in 1898 

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

 tration published by ^Messrs Walsh and Riley was sufticient 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- 

 a b i 1 i s Rathv. and the secreted cottony mass is somewhat depressed, 

 faintly bjlobed and transversly undulated. This species has been taken 

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

 It is also known to occur in Iowa, Alabama, Washington D. 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 



