292 



THE CANADIAN ENTOMOLOGIST. 



Sa?t Jose Scale ( Aspidiotus pej-niciosus). — The San Jose Scale is 

 readily distinguished by the characteristic shape of the fetnale scales. 

 They are round and nearly white, with generally a clearly-defined central 

 nipple. After the first moult the scales become almost black, with a 

 conspicuous depressed ring around the nipple. The adult male scale is 

 oblong in outline, with the nipple near one end, and is much smaller than 

 the female. 



f 



Fig 



-San Jose Scale. 



The following points will clearly separate the San Jose Scale from the 

 Oyster-shell Bark-louse and the Scurfy Scale : 



First : The arrangement or grouping of San Jose' Scales on the bark 

 is generally characteristic, and is often sufficient to at once identify them. 

 They seldom have a tendency to cluster, if there be few in number, but, 

 instead, are scattered somewhat evenly on the bark. 



On badly-infested trees the presence of the scale on new growths and 

 the fruit produces a deep-red coloration on the tissues of the bark. 



It leaves no conspicuous, ventral, whitish scale on the bark after the 

 removal of the insect, as does the Scurfy Bark-louse. 



