Grasshoppers of Wyoming and the West

Entomology

Finned Grasshopper

Trachyrhachys aspera (Scudder)

Table 1. Density of Trachyrhachys aspera, Opeia obscura, and assemblage of grasshopper species in shortgrass prairie of Colorado (Central Plains Experimental Range). Results calculated from 100 1-sq. ft. samples taken in late August.

	No. grasshoppers per sq. yd.
Sampling date	T. aspera	O. obscura	Assemblage
29 August 1972	0.45	0.54	1.98
25 August 1973	0.63	0.81	1.98
22 August 1974	0.72	1.26	3.51
29 August 1975	0.27	0.27	0.90

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