91 ; 



INJURING THE TWIGS AND SMALLER BRANCHES. * 



THE CICADAS. FAMILY CICADIDiE. ' 



P^RT OF C.A.SE 31. 

 172. The Seventeen- Year Cicada. 



Tihlcm seplendecim Linii. . 



A most destructive species, but owing to the long period required by the young to i 



reach maturity only injurious during certain years. i 



Exhibit: Adults, pupa, work. j 



THE SCALE INSECTS. FAMILY COCCIDiE. j 



I^A-RT OK' CASK :i\. • i 



173. The Cottony Maple Scale. j 



Pulrinana innumerabiiis Rathv. I 



Becomes at times very abundant on twigs of maple. 

 Exhibit: Adult scales on twigs. 



174. The Gloomy Maple Scale. 



AspidlolHS tenebricosus Comst. 



At times very abundant on maple. Principally injurious to shade trees in the 

 neighborhood of towns. 



Exhibit: Adult scales on bark. . i 



175. The Hickory Soft Scale. 



Lecanium sp. : 



At times abundant on hickory and pecan in the Southern States. 

 Exhibit: Adult scales on twigs. 



THE TWIG WEEVILS. FAMILY CURCULIONIDiE. 



PARI" OF CASK :i'^. 



176. The Western Spruce Weevil. 



Pissodes sp. 



Attacks and kills the terminal shoots of Sitka sprnce, causing deformed trees. 

 Northwestern States. 



Exhibit: Adults, larvfe, work. 



177. The White-Pine Weevil. 



Pissodes strobi Peck. , 



Attacks and kills the terminal shoots of white pine, spruce, and deodar, causing ' 



serious deformity to the tree; also breeds in the bark of the lower p(jrtion.s of tlie ! 



trunk of pine and spruce, hastening the death of injured trees. Eastern States. | 



Exhibit: Adults, work. Sections of young white pine showing nature of injury 



to terminal shoots. (Large case. ) ; 



ROUND-HEADED BORERS. FAMILY CERAMBYCIDJE. 

 PARP OF CASE 32. 

 178. The Oak Pruner. ; 



Elaphidion villosum Fab. j 



The larvse bore in twigs of living oak, hickory, etc., causing them to break and i 

 fall. 

 Exhibit: Adults, work. i 



