Melanoplus marshalli has only been collected a few times in Wyoming.
On this survey several specimens were collected on Deadline Ridge at 10,000
feet in elevation in Sublette County. They occur on other high mountains
in southwest Wyoming. They are very similar in appearance to M. oregonensis.
Our specimens show more red on the femur and a tinge of blue on the tibia,
but these characteristics are not consistent. Adults were collected August
10, 1990. Because of its limited distribution it causes no economic damage
Ref: Pfadt 1986.