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KNTOMOLOGICAL SOCIETY. 



57 



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Fig. 15. Two enemies of the San Jose Scale, (a) Beetle; (6) larva; (c) pupa of Pitifut 

 Lady-beetle {Pentilia misella) ; (d) blossom end of pear, showing scales with larva 

 and beetles feeding on them ; (e) Twice-stabbed Lady-beetle (Chilocorus hivulnerus) ; 

 (/) its larva, (a, b, c and d after Howard, & Marlatt, c and / after Riley). 



Curtis scale (Aspidiotus ostreceformis Figs. 16-18, 



This scale is mucli more widely distributed throughout Ontario than 

 has been hitherto supposed, but in spite of its prevalence, it does not seem 

 to be very destructive. 



The adult female resembles the San Jose in being circular and having 

 the exuviae centrally situated as a rule, though with many exceptions. It 

 differs, however, in several important particulars : (1) It is considerably 

 larger, averaging about 2 mm. in diameter, whereas the San Jose averages 

 about 1.4 mm. (2) It is much more convex. (3) A smaller proportion of 

 the exuvial part is light colored, in fact only the nipple, whereas a con- 

 siderable part of the central portion of the San Jose was lighter than the 

 general color of the scale. (4) There is a light or whitish colored margin 

 to bp seen around the outside of most of the scales. (5) The surface is 

 rougher. (6) The usual winter form is not nearly black like the San Jose 

 but is a whitish brown, and has no ring or depression around a distinct nip- 

 ple. 



This scale passes the winter in mature condition for the most part. It 

 matures about the end of June. Like the San Jose it brings forth living 

 young which continue to be produced throughout nearly all of July. There 

 is, however, only one generation in a year. 



