|Adult male||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.
T. aspera fact sheet from the Field Guide
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Biology of Common Colorado Grasshoppers
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