Skip to Main Navigation. Each navigation link will open a list of sub navigation links.

Skip to Main Content

Apply Now to the University of Wyoming apply now
Visit Campus
Download UW Viewbook
Give to UW

Grasshoppers of Wyoming and the West

Renewable Resources

Trachyrhachys aspera (Scudder)


Adult female

Common name - Finned grasshopper.

Geographic distribution - from Pine Bluffs, Wyo., south through Colorado to the Sacramento Mountains in New Mexico, the Davis Mountains of Trans Pecos, Texas, and the Chinati Mountains (Tinkham, 1948). In Colorado it is found from the eastern plains to the eastern mountain valleys (Hebard, 1929).

Colorado Distribution Map

Habitat - lives in meadows and other grassy areas (Tinkham 1948).

Food habits - preferred food is blue grama but also has been seen feeding on sand dropseed (Joern,1979a; Kumar et al., 1976).

Adult - medium size; robust. Color is dark gray-brown. Face is vertical. Vertex is rounded. Antennae are slender. Head is rather large. Dorsal posterior margin of pronotum is a right angle. Posterior angle of lateral lobe of pronotum usually is a right angle. Median carina of pronotum is cut deeply by two sulci. Tegmina have two or three indistinct bands and a short longitudinal row of tiny spots that get smaller toward the apex. Wing disc is pale yellow; wing band is grey to black; apex usually is clear. Overall body is roughly textured. Hind femora have high fins, the upper one suddenly decreasing near the middle. Hind tibiae usually are blue, pale or brown basally. Male length, 15 mm; female, 25 mm (Ball et al., 1942; Tinkham, 1948).
 

Pronotum (Side view) Tegmen

Seasonal history - adults are present from mid-August through October (Van Horn, 1972).

Abundance and importance - may be locally abundant in northern Colorado.

Next Species: Trachyrhachys kiowa
Previous Species: Spharagemon equale
Biology of Common Colorado Grasshoppers List
Biology of Common Collorado Grasshoppers
Grasshoppers of Colorado Contents

Contact Us

Scott Schell

Room #9, Agriculture Bldg.

Phone: (307) 766-2508

Email: insectid@uwyo.edu

1000 E. University Ave. Laramie, WY 82071
UW Operators (307) 766-1121 | Contact Us | Download Adobe Reader

Accreditation | Virtual Tour | Emergency Preparedness | Employment at UW | Privacy Policy | Harassment & Discrimination | Accessibility Accessibility information icon