114, MISC. PUBLICATION 273, U. S. DEPT. OF AGRICULTURE 



Knaus' ips (/. hnausi Sw.) attacks loclgepole pine, ponderosa pine, 

 and Arizona pine through the pine belt of Arizona, New Mexico, 

 and Colorado. It is usually a secondary enemy. In its habits, char- 



FiGCRE 55. — Galleries and pupal cells of The eraarginate ips (/. emarginatus) un tbe inner 

 bark surface of ponderosa pine. 



acter of work, and appearance it closely resembles its near relative, 

 /. emarginatiis^ and may be considered the southern Rocky Mountain 

 form of this beetle. 



