98 NEW YORK STATE MUSEUM 



our notice occurred in 1901, at which time a number of hard 

 maples in Albany, N. Y. and Worcester and vSpringfield, Mass. 

 were very badly infested. This species appears to have been some- 

 what abundant and destructive the past summer to the hard maples 

 at Mount Vernon, N. Y. It may be readily distinguished from the 

 more common cottony maple scale, Pulvinaria innumer- 

 a b i 1 i s Rathv., and its allies by the presence of the woolly females 

 on the under surface of the foliage and the numerous minute young 

 on the bark, particularly that of the large/ limbs and trunk. There 

 is another maple leaf scale, Pulvinaria acericola Walsh 

 & Riley, which occurs on the underside of maple foliage. This 

 form may be at once recognized, however, by the conspicuous 

 brown scale so characteristic of the cottony maple scale. This 

 maple leaf scale so far as known is by no means common though 

 it is very probable that it has been confused with the more preva- 

 lent destructive cottony maple scale. Neither of these Pulvinarias 

 occur in white felted masses on the bark of the larger limbs and 

 trunk, which is very characteristic of the maple PhenacOccus. This 

 species should be controlled as well as the cottony maple scale, and 

 it is probable that both respond equally well to thorough and timely 

 spraying with a 10 or 12% kerosene emulsion or a strong whale 

 oil soap solution. 



Woolly maple leaf aphid (Pemphigus acerifolii Riley) . 

 This species is rarely abundant enough in New York State to 

 attract popular notice. It was so numerous during the summer 

 of 1905 that a number of inquiries accompanied by soft maple 

 leaves almost covered with these woolly plant lice were received 

 from different sections of the State. Complaints of this character 

 came from Cornwall, Menands, and what was presumably this 

 species gave rise to a report from Floral Park. This aphid may 

 be easily recognized by the large amount of woolly matter, which 

 is sometimes nearly as long as the insect itself. It may be sej>a- 

 rated from the closely allied Pemphigus aceris Monell, 

 which lives on the underside of hard maple limbs, by the antennae 

 reaching only to the wing insertion, whereas in the last named the 

 fourth joint extends to the base of the wings. These plant lice 

 usually desert the trees early in June and as a rule remedial 

 measures are unnecessary. 



Forest tree insects 

 Black walnut worm (Datana integerrima Grote & 

 Rob.). The work of this species on black walnut and butternut 



