21 



THE PERIODICAL CICADA. 



Tiliii'in Si Jill iidi i-iiii l/mil. 



(Sco spociiil case coiitaiiiiiiii' life liistory. with illiisi i-iitioiis of tliis 

 insect iind its work.) 



For life liistoi'V and oeiieriil article see Mai'latt. Fml. 14, ii. s., Div. 

 Ent., r. S. Dept A<,n-ic., 1S!)S. 



Hxhihit: Pupa, piqja skins, and adult. 



THE SAN JOSE SCALE. 



Aspidiotus pcrniciosuH Coinst. 



(Food })lants: .Vhnond. apple, apricot, ])irch, hlack walinit. black 

 currant, catalpa, chestnut, crab apple, crab o;rass, cherry, j^rape, 

 hickor}-, oak, peach, pear, persimmon, plum, poplar, ])rune, Kock}^ 

 INIountaiu cherry, rose, silver maple, willow, and many other [)lants. 

 See under "^More important scale insects.") 



For bibliotrraph}' and food plants see Fernald, Cat. Coccidiv of 

 World, Hul. S8, Mass. \^v. Coll., pp. 271-275, 11>03; Howard and 

 Marlatt. Bui. 3, n. s., Div. p:nt., U. S. Dept. Ajrric, 1S90. 8») pp. 



EximuT: Infested twig-. 



PUTNAM SCALE; CRANBERRY SCALE. 



Aspidiotuii uncylus Piitii. 



(Food plants: Apple, apricot, box elder, cottonwood, craid)erry, 

 elm, hcMnlock, maple, oak, p(>ach, pear, plum, etc. See under '"More 

 important scale insects.") 



For bibliography and food ])lants sec Fernald, Cat. Coccida* of 

 World, Bui. SS, Mass. Agr. Coll., pp. 252-253, 19()3. 



PIxiiihit: Infested twio-. 



THE CHERRY SCALE; FORBES' SCALE. 



^[xpitlloliis fnrlirni Join is. 



(Food plants: Apple, cheri-y. c-urrant, honey locust, [)each, pear, 

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



Foi- l»il)lio<rraphy and food platits sec lM>rnald, Cat. Coccidic of 

 World, Bui. SS, :Mass. A.o-r. Coll., pj). 251>-2«50. l!>03. 



Exhibit: Infested twig. 



THE GREEDY SCALE. 



A.ij)i(liiilii.i ra/Hi.r C'oiiist. 



(Food plants: Cottonwood, niaple, olive, pcai-, (|uinc(\ ap|)le. etc. 

 See under "More important scale insects.") 



For bibliogi-ajjhy and food plants see Fernald. Cat. C«»ccidie of 

 World, Bui. SS, Muss. Agr. Coll., pp. ■JT«;-27S, iy(»3. 



Exhiiut: Infested twio-. 



