114 MISC. PUBLICATION 273, U. 8S. DEPT. OF AGRICULTURE 
Knaus’ ips (/. knaust Sw.) attacks lodgepole pine, ponderosa pine, 
and Arizona pine through the pine belt of Arizona, New Mexico, 
and Colorado. It is ustially a secondary enemy. In its habits, char- 
FIGURE 55.—Galleries and pupal cells of the emarginate ips (J. emarginatus) on the inner 
bark surface of ponderosa pine. 
acter of work, and appearance it closely resembles its near relative, 
T. emarginatus, and may be considered the southern Rocky } Mountain 
form of this beetle. 
