Fairly stout-bodied small grasshopper with large rounded head, with lateral faveolae (in front of and above eyes) visible from above; antennae (almost always) white or nearly so; folded wings overlapping above, usually long, though often short in high elevation populations in Southwest; even when short, usually longer than combined length of head and pronotum, and often reaching past tip of hind femora; hind femur thick with a triangular dark spot on the middle of the top and (in adults) with "knees" usually distinctly dark.
Occasional individuals have brown antennae, especially at high elevation and toward the end of the season. It could be that cold weather can cause not only the coloring of the body, but also of the antennae to darken.
Eupnigodes species (found in California only) are very similar, but averate a little more slender, hind tibiae often are not red, and knees of hind femora are not as dark.
Psoloessa species have the proportions of the pronotum somewhat different (notably the rear angle is usually more acute) and the lateral margins of the pronotum usually cut only once by sulci - they are most common as adults in spring (but are long-lived). Their antennae are usually darker in color.
Aulocara species have dark antennae and blue hind tibiae.
Heliaula rufa has a different color pattern and larger head, also with antennae usually darker.
Wide-ranging and often common in dry short grasslands, from British Columbia to Michigan and south to Texas and northern Mexico.
Overwinters as eggs in ground, hatch in spring or summer, with adults from sometime in late spring or summer until frost. Often most abundant late in summer and in autumn, but timing varies somewhat with region, climate, and from year to year.
Other species of Ageneotettix.