21 



THE PERIODICAL CICADA. 



Tlbicen septendecim Linn. 



(See special case containing life history, with illustrations of this 

 insect and its work.) 



For life history and general article see Marlatt, Bui. ltt, n. s., Div. 

 Ent., U. S. Dept Agric, 1898. 



Exhibit: Pupa, pupa skins, and adult. 



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, 

 hickory, oak, peach, pear, persimmon, plum, poplar, prune, Rocky 

 Mountain cherry, rose, silver maple, willow, and man} r 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. 



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. Coccidge 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. Coccidas of 

 W 7 orld, Bui. 88, Mass. Agr. Coll., pp. 259-260, 1903. 



Exhibit: Infested twig. 



THE GREEDY SCALE. 



Aspidiotus rapax Comst. 



(Food plants: Cottonwood, maple, olive, pear, quince, apple, etc. 

 See under "More important scale insects.") 



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

 World, Bui. 88, Mass. Agr. Coll., pp. 276-278, 1903. 



Exhibit: Infested twig. 



