158 
Psyche 
[June-September 
It is presumably to feed upon staminate cones that C. monstrosa 
nymphs and adult females are observed at dusk climbing high into 
the trees. A useful method of collection is to search tree trunks with 
a flashlight just after sunset. The insects are always discovered 
oriented head upward. More often than not they occur in groups of 
2 to 4 on the same trunk, which suggests that they may aggregate 
during their daytime stay in the leaf litter of the forest floor. 
David Lightfoot of Oregon State University has studied C. 
monstrosa at Three Sisters in the central Oregon Cascades. He 
found this species abundant there in drier, more open stands of 
lodgepole pine and mountain hemlock ( Tsuga mertensiana) above 
5000' elevation. In contrast to our observations of ascent as the 
evening progresses Lightfoot notes that the singers begin high in the 
trees (about 6 in) and gradually occupy lower and lower perches 
until singing at ground level. 
C. strepitans is found in both subalpine forest and high altitude 
sagebrush prarie. The holotypic site near Big Creek Lakes is an open 
forest of subalpine fir (Abies concolor ) and lodgepole pine at an 
altitude of 8800'. At Los Pinos Pass, Colorado, strepitans is found 
in aspen woods adjacent to open areas of prairie. The mature aspen 
(Populus tremuloides ) has an understory of subalpine fir and 
englemann spruce (altitude 10,200'). Two predominant ground 
cover plants at both sites are kinnikinik (Arctostaphylos spp.) and a 
shrubby juniper (Juniperus communis). In the high altitude (8400') 
sagebrush (Artemesia tridentata) prairie of North Park, Colorado, 
the density of singing males appeared to be much greater than in the 
nearby pine forest of the holotypic site to the east. C. strepitans is 
also very numerous in the sagebrush areas (altitude 6700') of Grand 
Teton National Park, Wyoming. In late June, 1978, aggregations of 
singing males were easily heard while we drove along park roads at 
night. Thus, C. strepitans may be considered a predominantly 
sagebrush species although occurring in open forest habitats in the 
vicinity of sagebrush prairie. 
Acoustic Behavior 
Males of all three species produce a succession of short musical 
trills, beginning in late evening and continuing well past midnight if 
weather permits. C. buckelli invariably sing near the ground from 
low shrubs (knee-height), the bases of tree trunks or on the forest 
