2l6 NEW YORK STATE MUSEUM 



possible that more than one species may have been confused, thouo-h 

 Mr King has recently compiled a list of 23 food plants on which this form 

 is said to occur. 



Distribution. This species is common over a large proportion of New 

 York State, and has been recorded from most of the Eastern and some of 

 the Western States, and also from Ontario, Nova Scotia, New Brunswick and 

 Prince Edward Island. 



Natural enemies. One hymenopterous parasite, A bier us cl i sic- 

 ca mpae Ashm., has been bred from this scale insect by Dr Howard. 

 Two Coccinellids, H y p e r a s p i d i u s species and C h i 1 o c o r u s b i v u 1- 

 ner u s Muls., the twice stabbed ladybeetle, prey on this pest. The latter 

 is stated to be a specially valuable enemy. 



Remedies. The recommendations for controlling this insect are the 

 same as those advised for the oyster scale, to which the reader is referred. 



Bibliography 

 1S56 Fitch, Asa. Ins. N. Y. 3d Rep't, p. 34-35 

 1S94 Howard, L. O. U. S. Dep't Agric. Year Book, p. 259-61 

 1901 Felt, E. P. N. Y. State Mus. Bui. 46, p. 300-4 



San Jose scale 



Aspidiotiis pcrniciosiis Comst. 



A circular, grayish or yellowish scale insect, about y,6 inch in diameter, and 

 frequently surrounded by large numbers of much smaller, nearly black scales having a 

 central nipple and one or two grayish rings. 



This introduced species has become so well known to fruit growers 

 that we commonly think of it as depredating almost entirely on fruit trees. 

 Such is not the case as this species occurs on a large number of other trees 

 and may be very abundant on the flowering quince in particular. It also 

 thrives on a number of other plants grown in parks for ornamental purposes 

 and a brief account of this species is therefore included in this work. 



Description. This species is more readih" recognized by its effect on 

 the tree or shrub than by the characteristics of the individual. Trees which 

 have been badly infested for some time have a rough bark covered with 



