326 NfeW YORK STATE MUSEUM 



1899. 10: 18-20 (record of introduction, distribution, food plants); An 

 account of Aspidiotus ostreaeformis. U. S. dep't agric. div. 

 ent. Bui. 20, n. s. 1899. p. 76-82 (detailed account). 



Newell, Wilmon. On the North American species of the subgenera 

 Diaspidiotus and H e m i b e r 1 e s i a , of the genu> Aspidiotus. 

 la. state coll. of agric. and mechanic arts. Contributions from the dep't 

 of zoology and entomology, no. 3. 1899. p. 10 (form described as A. 

 hunteri) p. 17-18 (synonymy, description). 



Parrott, P. J. Kan. state hortic. soc. Trans. 1898. 1899. 

 p. 108 (mention). 



Felt, E. P. Injurious and other insects of the state of New York. 

 15th rep't. N. Y. state mus. Bui. 31. 1900. v. 6. p. 617-18 (locali- 

 ties and food plants noted during the year) ; Illustrated descriptive cata- 

 logue of some of the more important injurious and beneficial insects of 

 New York state. Bui. 37. 1900. v. 8. p. 13 (character- 

 istics and remedies). 



Lochhead, William. San Jose and other scale insects. Ont. dep't 

 agric. 1900. Toronto, p. 33-35 (brief account of it in Canada). 



Pettit, R. H. Some insects of the year 1899. Mich, agric. expt. 

 sta. Bui. 180. 1900. p. 120-24 (brief general account). 



Putnam's scale insect 



Aspidiotus ancylus Putnam 



PLATE 5 



This is the most common native species of Aspidiotus found on 

 fruit trees and shrubs in New York state. Occasionally it may occur in 

 such large numbers as to be somewhat destructive, but ordinarily natural 

 agents of one kind or another keep it in check. Mr Cooley records a 

 case in Massachusetts where nearly every tree in a young apple orchard 

 was infested, some abundantly, and one was dying from the attacks of this 

 species. This record is very exceptional, at least for New York state, 

 though I have seen it very abundant on currant. 



Description. This species is of importance largely because of the 

 liability of its being mistaken for the much more dangerous, pernicious, 

 or San Jose scale. It is distinguished with difficulty by external char- 

 acters from the preceding species. A twig badly infested with Put- 

 nam's scale has a dark gray or almost black color relieved here and there 

 by the reddish, eccentric larval skins or exuviae. There are few or none of 



