21 



THE PERIODICAL CICADA. 



Tibicen neptendecirn Linn. 



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

 insect and its work.) 



For life history and jjeneral article see Marlatt, Bui. 14, n. s., Div. 

 Ent, U. S. Dept Agric, 1898. 



Exhibit: Pupa, pupa skins, and adult. 



THE SAN JOSE SCALE. 



Aspldiutu.'i jnrnlciusuti Cumat. 



(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 many other plants. 

 See under "More important scale insects.") 



For bibliography and food plants see Fernald, Cat. Coccida* of 

 World, Bui. S8, 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. 



AspiduAns ancylus Putu. 



(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. Coccidse of 

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



Exhibit: Infested twig. 



THE CHERRY SCALE; FORBES' SCALE. 



A npidiut f (.s Jorhesi J ul i n.s. 



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

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



For l)ibliography and food plants see Fernald, Cat. Coccida> of 

 World, Bui. ss, Mass. Agr. Coll., pp. 259-200, 1903. 



Exhibit: Infested twig. 



THE GREEDY SCALE. 



Aitpidiotun riipax Comst. 



(Food plants: Cottonwood, maple, olive, pear, (|uin(o. apple, etc. 

 See under "More important scale insects."') 



For bibliography and food plants see Fernald, Cat. C'occidte of 

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



Exhibit: Infested twig. 



