1907 



ENTOMOLOGICAL SOCIETY. 



69 



Fig. 25. Oyster-sliell Barklouse (Lepidosaphes ulmi). (a) Adult fenaale, back view, 

 showing the two moulted skins at anterior end, and the bristles of the sucking 

 tube ; (b) adult female turned over, showing the insect at the anterior end and the 

 eggs^t the posterior end; (c) adult male scale, much smaller than female, with one 

 moulted skin at anterior end. 



The Scurfy Scale, Chionaspis furfura, (Fitch). Figs. 26 and 27. 



The Scurfy Scale, though widely distributed throughout Ontario, is- 

 seldom found in so great abundance as the Oyster-shell. Badly infested 

 trees or other plants are very much weakened and not infrequently die as a 

 result. 



The mature female scale is somewhat of the shape of the Oyster-shell , 

 but is much broader in proportion to its length, and is more properly describ- 

 ed as pear-shaped, being 2-3 mm. long, 1-2 mm. wide in the broadest part 

 and tapering rapidly to a fine point at one end. It is very slightly convex 

 and is grayish white in color. The scurfy appearance which it gives to a 

 badly infested branch or twig has evidently been the cause of its receiving 

 its present popular name. 



The male scale is very different from the female. It is elongate in shape, 

 is only about 1-3 the length of the female, is whiter in color and has three 

 parallel longitudinal ridges on its back (tricarinate). 



