296 ' NEW YORK STATE MUSEUM 



found beneath the scales in winter. Occurs on many trees and shrubs, 

 (pi. i) Appletree bark louse, Mytilaspis pomorum 



2 Adult female scales irregularly expanding from a slender tip, about ^^ 

 inch long and white or a dirty white. Purplish eggs may be found 

 under the scales in winter. Male scales slender, white, with three 

 ribs. Common on fruit trees and shrubs, (pi. 2) 



Scurfy bark louse, C h i o n a sp i s furfur a 



3 Adult female scales circular or oval, usually a dark gray to black, 

 about yV inch in diameter, and with the brick red cast skin or exuviae to 

 one side of the center. Margin of the scale usually well defined. The 

 young scales remain white or pink for a considerable time and usually 

 have a well developed nipple and an inconspicuous ring. Very common 

 in New York state. On fruit and other trees, specially maple and elm. 

 (pi. 5) Putnam's scale insect, Aspidiotus ancylus 



4 Adult female scales circular, gray or yellowish gray, about xr inch in 

 diameter and with the yellowish cast skin or exuviae central. Young 

 scales dark gray, sometimes almost black, with a distinct central nipple 

 and a grayish ring. Green tissues are frequently stained purplish by this 

 insect. May occur on many trees and shrubs, (pi. 3) 



San Jose scale insect, Aspi dio tus perniciosus 



5 Adult female scales nearly circular, usually a gray or a dark gray, 

 with a diameter of ■§- inch and with the yellowish or red cast skin or 

 exuviae a little to one side of the center. The gray, dirt-spotted, outer 

 portion of the scale is usually continuous with the outer layer of rough 

 bark, but this does not hold on smooth bark. The young scales are 

 white or brownish and have a distinct nipple but almost no ring. They 

 are sometimes arranged very prettily at almost equal distances. Occurs 

 on fruit trees, specially plums, (pi. 4) 



European fruit scale insect, Aspidiotu s ostreaeformis 



6 Adult female scales nearly circular, usually a yellowish gray, about 

 yV inch in diameter and with the yellowish larval skin or exuviae a little 

 to one side of the middle. Young scales white or pinkish, with the nip- 

 ple and ring, specially the latter, not well marked. Occurs on fruit trees, 

 (pi. 6) Cherry scale insect, Aspidiotus forbesi 



7 Adult femile scales nearly circular, almost white, about ■^^ inch in 

 diameter and with the yellowish larval skin or exuviae a little to one side 

 of the center. Young scales yellowish or white. Confined in New York 

 state to greenhouse plants, common on ivy. (pi. 7; 



White scale insect, Aspidiotus hederae 



