2l8 NEW YORK STATE MUSEUM 



ments, wliich 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 

 I)r Howard, while the females require from 33 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 Britton has gone to consid- 

 erable trouble in preparing this, consulting entomologists throughout the 

 country, and the l)are list of plants is reproduced below. 



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



.\cacia sp. Poi)ulu.s d c 1 1 o i d e s Marsh. Carolina 



Akebia s[). New York. poplar. 



Akebia qu in a t a Decaisne. P o p u 1 u s nigra Linn. var. italica 



Amelanchier canadensis Medic. l^uRoi. Lombardy poplar. 



and other species. Shadbush, Junel)crry. P r u n u s a m y g d a 1 u s Stokes. Almond. 



CI t ru s t r i f oliat a Linn. Primus armeniaca Linn. Apricot. 



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



Lodd. P r u n u s p u m i 1 a Linn. 



C o r n u s b a i 1 e y i Coult & Evans. Prunus j) u m i 1 a var. b e s s e y i Waugh. 



Corn us sanguine a Linn. Sand cherry. 



Co tone aster s])? Prunus cerasifera Ehrh. var. a t r o- 



Coto nea ster v ul garis Lindl. purpurea Dipp. (P. pissardi) 



Crataegu s sjj. Hawthorn. Purple-leaved plum. 



Cra t aegu s cordat a Soland. Prunus d o m e s t i c a Linn. European 



Crataegus o .\ y a c a n t h a Linn., Kng- plum. 



iish hawthorn. Prunus hortulana Bailey. Wild 



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



Crat aegu s cru s-galli Linn. P r u n u s j a p o n i c a Thunb. Flowering 



Cydonia vulgaris Pers. Quince. almond. 



Cy d on i a j a]) on i c a Pers. Japanese or Prunus maritima AVaugh. Beach 



flowering (|uince. plum. 



Fag us sylvatica Linn. var. i)uri)u- Prunus persica Sieb. & Zucc. Peach. 



rea .-Mt. European purple-leaved beech. Prunus tri flora Roxbg. Japanese 



J u g I an s s i ebo 1 d i an a Maxim. Japan- plum. 



ese walnut. Prunus scroti n a Ehrh. Cherry. 



Li gust ru m V u Igare Linn. Privet. Prunus virginiana Linn. Choke- 



Populus sp. Poplar. cherry. 



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



