33 



OYSTER-SHELL BARK-LOUSE. 



Lepidosaphes ulmi Linn. 



(Attacks principally apple, currant, Cornus, cottonwood, lilac, pear, 

 sassafras, etc. ; formerly Mytilasjpis pomorum Bouche. See under 

 "More important scale insects.") 



For bibliography and food plants see Fernald, Cat. Coccidee of 

 World, Bui. 88, Mass. Agr. Coll., pp. 314-317, 1903. 



Exhibit: Infested twig. 



THE SCURFY BARK-LOUSE. 



Chionaspis furfura Fitch. 



(Food plants: Apple, cherry, currant, elm, pear, etc. See under 

 "More important scale insects.") * 



For bibliography and food plants see Fernald, Cat. Coccidre of 

 World, Bui. 88, Mass. Agr. Coll., pp. 217-219, 1903; Howard, Year- 

 book, U. S. Dept. Agric, 1891, pp. 259-261, fig. 



Exhibit: Infested twig. 



THE SAN JOSE SCALE. 



Aspidiotus perniciosus Comst. 



(Food-plants: Almond, apple, apricot, birch, black walnut, black 

 currant, catalpa, chestnut, crab-apple, crab-grass, cherry, grape, hick- 

 ory, oak, peach, pear, persimmon, plum, poplar, prune, Rocky Moun- 

 tain cherry, rose, silver maple, willow, and many other plants. See 

 under "More important scale insects.") 



For bibliography and food plants see Fernald, Cat. Coccidae of 

 World, Bui. 88, Mass. Agr. Coll., pp. 271-275, 1903; Howard and 

 Marlatt, Bui. 3, n. s., Div. Ent., U. S. Dept. Agric, 1896. 80 pp. 



Exhibit: Infested twig. 



PUTNAM SCALE; CRANBERRY SCALE. 



Aspidiotus ancylus Putn. 



(Food-plants: Apple, apricot, box-elder, cottonwood, cranberry, 

 elm, hemlock, maple, oak, peach, pear, plum, etc. See under "More 

 important scale insects.") 



For bibliography and food plants see Fernald, Cat. Coccidre of 

 World, Bui. 88, Mass. Agr. Coll., pp. 252-253, 1903. 



Exhibit: Infested twig. 



THE CHERRY SCALE; FORBES' SCALE. 



Aspidiotus forbesi Johns. 



(Food-plants: Apple, cherry, currant, honey locust, peach, pear, 

 plum, walnut, etc. See under "More important scale insects.") 



For bibliography and food plants see Fernald, Cat. Coccidee of 

 World, Bui. 88, Mass. Agr. Coll., pp. 259-260, 1903. 



Exhibit: Infested twig. 



3600— Xo. 47—04 3 



