215 NEW YORK STATE MUSEUM 



ments, which spring from all parts of the body rapidly, become thicker and 

 slowly mat down to form the circular white scale with a depressed ring and 

 central elevation. This gradually darkens and in a few days is black or 

 dark gray with one or more lighter rings. Several molts take place and the 

 males attain maturity in from about 24 to 26 days from birth, according to 

 Dr Howard, while the females require from t,t, to 40 days in the latitude of 

 Washington. This species breeds in the vicinity of Albany from the latter 

 part of June through October and appears to develop three generations 

 normally with the possibility of a fourth under exceptional circumstances. 



Food plants. This species is able to exist on a large number of food 

 plants, as is evidenced by the recent list ' prepared by Prof. W. E. Britton, 

 state entomologist of Connecticut. Professor Brilton has gone to consid- 

 erable trouble in preparing this, consulting entomologists throughout the 

 country, and the bare list of plants is reproduced below. 



List of hardy trees, shrubs and vines commonly or badly infested 



Acacia sp. P o p u 1 u s d e 1 1 o i d e s Marsh. Carolina 



Akebia sp. New York. poplar. 



Akeb ia qu in at a Decaisne. Populus nigra Linn. var. italica 



Anielanchier canadensis Medic. DuRoi. Lombardy poplar. 



and other species. Shadbush, Juneberry. Prunus amygdalus Stokes. Almond. 



Citrus t r i f o 1 i a t a Linn. Prunus a r ni e n i a c a Linn. Apricot. 



Corn us alba Linn. var. sibirica Prunus avium Linn. Sweet cherry. 



Lodd. Prunus p u m i 1 a Linn. 



C o r n u s b a i I e y i Coult & Evans. P r u n u s p u m i 1 a var. b e s s e y i Waugh. 



C o r n u s s a n g u i n e a Linn. Sand cherry. 



Cotoneaster sp? Prunus cerasifera Ehrh. var. a t r o- 



Cotoneaster vulgaris Lindl. purpurea Dipp. (P. i)issardi) 



Crataegus sp. Hawthorn. Purple-leaved plum. 



Crataegus cordata Soland. Prunus domestica Lmn. European 



Crataegus oxyacantha Linn., Eng- plum. 



lish hawthorn. Prunus hortulana Bailey. Wild 



Crataegus c o c c i n e a Linn. goose plum. 



Crataegus crus-galli Linn. Prunus Japonic a Thunb. Flowering 



C y d o n i a vulgaris Pers. Quince. almond. 



Cydonia japonica Pers. Japanese or P r u n us m a r i t i m a Waugh. Beach 



flowering quince. plum. 



Fagus sylvatica Linn. var. p u r p u- Prunus ]i e r s i c a Sieb. & Zucc. Peach. 



reaAit. European purple-leaved beecli. Prunus triflora Roxbg. Japanese 



J u gl a n s s i e b o 1 d i a n a Maxim. Japan- plum. 



ese walnut. Prunus scroti n a Ehrh. Cherry. 

 Ligustrumvulgare Linn. Privet. Prunus virginiana Linn. Choke- 

 Pop u 1 u s sp. Poplar. cherry. 



' 1903. Britton, W. E. Ct. State Ent. 2d Rep't. 1902. p. 132-37 



