91 
INJURING THE TWIGS AND SMALLER BRANCHES. 
THE CICADAS. FAMILY CICADIDZ. 
PART OF CASE 31. 
172. The Seventeen-Year Cicada. 
Tibicen seplendecim Linn. 
A most destructive species, but owing to the long period required by the young to 
reach maturity only injurious during certain years. 
Exuisitr: Adults, pupa, work. 
THE SCALE INSECTS. FAMILY COCCIDA. 
PART OF CASE 31. 
173. The Cottony Maple Scale. 
Pulvinaria innumerabilis Rathy. 
Becomes at times very abundant on twigs of maple. 
Exuisit: Adult scales on twigs. 
174. The Gloomy Maple Scale. 
Aspidiotus tenebricosus Comst. 
At times very abundant on maple. Principally injurious to shade trees in the 
neighborhood of towns. 
Exuipir: Adult scales on bark. 
175. The Hickory Soft Scale. 
Lecanium sp. 
At times abundant on hickory and pecan in the Southern States. 
Exuisir: Adult scales on twigs. 
THE TWIG WEEVILS. FAMILY CURCULIONIDZ. 
PART OF CASE 32. 
176. The Western Spruce Weevil. 
Pissodes sp. 
Attacks and kills the terminal shoots of Sitka spruce, causing deformed trees. 
Northwestern States. 
Exurisit: Adults, larvee, 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 portions of the 
trunk of pine and spruce, hastening the death of injured trees. Eastern States. 
Exuisir: Adults, work. Sections of young white pine showing nature of injury 
to terminal shoots. (Large case. ) 
ROUND-HEADED BORERS. FAMILY CERAMBYCIDA. 
PART OF CASE 32. 
178. The Oak Pruner. 
Elaphidion villosum Fab. 
The larve bore in twigs of living oak, hickory, etc., causing them to break and 
fall. 
Exuisit: Adults, work. 
