130 MISC. PUBLICATION 273, U. S. DEPT. OF AGRICULTURE 
and burn the infested trees or severely scorch the bark. No control 
work has been attempted in the West except in California for the 
control of a species affecting ornamental Monterey cypress. Ap- 
Figure 64.—Smali redwood scored by galleries of the redwood bark beetle (Phloesinus 
sequoiae) and a roundheaded horer (Semanotus ligneus var. sequoide). 
proximately 20 species have been described from western cedars 
and related trees. Many of these are rare and of little economic 
importance, 
