122 
Psyche 
[March 
Figure 1. Pond Nine (3416 m) on Galena Mtn. in the Mexican Cut 
Research Area owned by The Nature Conservancy. 7 September 1970. 
winged adult, and flies away as a reproductively immature (teneral) 
adult. The observations reported here are intended to correlate a late 
emergence season, a possible lowered temperature threshold, a com- 
plete shift to diurnal behavior, and an abbreviated, synchronized 
emergence period with the rigors of the high altitude habitat in 
Colorado. 
Habitat 
Two subalpine ponds were selected for study areas. They repre- 
sent the typical habitat where larvae of Somatochlora semicircularis 
are found. The emergence areas of both ponds are restricted to the 
shallow, sedge-filled margins. 
Pond Nine (3416 m) is one of a group of small ponds in the 
Mexican Cut Research Area on Galena Mountain (Gunnison Co., 
Colorado) owned by The Nature Conservancy and administered by 
the Rocky Mountain Biological Laboratory. It is 10 m in diameter 
and 1 m deep in the center. About 50% of its shoreline is lined with 
Carex rostrata and C. aquatilis in the shallow bays which make up 
the emergence areas for the dragonflies. The center of the pond is 
