Melanoplus yarrowii, commonly known as Yarrow's grasshopper, is a species of grasshopper found in North America. It is characterized by its medium-sized body, ranging from 1.5 to 2 inches in length, and its distinct coloration, with a dark brown or black body and yellow or orange markings. Yarrow's grasshopper is primarily herbivorous, feeding on a variety of grasses and plants in its habitat.