PINE LEAF SOALE-mSECT. 



161 



THE PINE LEAF SCALE-INSEGT. 



{Mytilaspis Pinifolii, Fitch.) 



The natural history of this insect was given at some length in the 

 author's first report. As it belongs to the family of Bark-lice {Coccidce), 

 but is in this case stationed upon the leaf, I distinguished it from its 

 congeners by the English title of the White Pine Leaf-louse. But as 

 the term Leaf-louse is usually restricted by entomologists to the various 

 species of Aphides, I have here restored^ Dr. Pitch's name, which is 

 free from this ambiguity. 



My object in referring to this insect again is, to till out a part of its 

 history which my observations last year were made too late to deter- 

 mine. I refer to the time of hatching of the first or spring brood. In 

 the former report, judging from what was known and from the analogy 

 of allied species, I stated that the spring bro6d would probably be found 

 to hatch in the month of May. The observations of the last spring 

 show this conjecture to have been correct. It appears from my note 

 book that the eggs were generally found hatched on the 25th of May, 

 but not so early as the 10th, in my own locality or the latitude of Chi- 

 cago. Happening to be at South Pass, in the southern part of the 

 State, on the last of May, I found the new scales about half grown, so 

 that it appears that the hatching of the first or spring brood of this 

 species corresponds very closely with that of the first and only brood 

 of the allied Bark-louse of the apple-tree. 



The coccus of the pine, like that of the apple-tree, and I might add, 

 also, like several species of the allied aphides, is first found on the low- 

 est branches of the infested trees. This suggests the idea of cutting 

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