Photo of squash bug adult
The adult squash bug has a flattened, elongate body, dark to grayish brown with a speckled pattern on the dorsum, and measure about 1/2 to 5/8 inch long. They may appear to have yellow to orange-striped borders on the abdomen. They release a foul odor when crushed.

Photo Source: Michael Bush, WSU Extension, Yakima, WA