42 



THE INSECT RECORD FOR I9OI 



our fruit growers, fortunately, are watching for this pest is 

 shown by the receipt by the station this year, as in previous 

 seasons, of our common apple-tree bark-lice, with the query 

 as to whether they were the San Jose scale. These bark- 

 lice are represented in the accompanying pictures. 



The gray or brown Oyster Shell Bark-louse ^ gets its 

 name from its resemblance to a miniature oyster shell : by this 

 fact it may be recognized. The whitish Scurfy Bark-louse ^ 



(Fig. 11) is shorter 

 and broader, with a 

 triangular outline. 

 This distinguishes it 

 from the San Jose 

 scale, which is round. 

 But in case of doubt 

 regarding any scale 

 upon trees or vines, 

 it should be sent to 

 the station for critical 

 examination. 



On the whole per- 

 haps the Brown-Tail 

 MoTH"^ is the one of 

 these pests which at 

 present should receive 

 the most serious con- 

 d c a b sideration. This in- 



FiG. 12. Oyster-shell bark-louse: a, scales on apple Sect is already well 

 twig ; b. female scale, back view, magnified ; <:, fe- established in many 

 male scale and eggs, under-side, magnified;^, ^Qy^j-,s Jj-j Massachu- 

 male scale, magnified. 



setts, where it is ex- 

 ceedingly troublesome. For it not only destroys the foliage 

 on a great variety of trees, but it also produces a serious af- 

 fection of the skin in people who come in contact with the 

 barbed hairs of the caterpillars. These hairs are very gener- 

 ally scattered in localities where the insects are abundant, as 



1 Mytilaspis poniorum Bouche. 



2 Chionaspis furfurns Fitch. 

 ^\Euproctis chrysorrhaea Linne. 



