Photo of melon aphids
Melon aphids, like other aphids, are soft-bodied, pear shaped with long antennae at one end and a pair of cornicles (tailpipes) on the posterior end. The cornicles secrete defensive fluids. Aphids have a long stylet (“straw’) they stick into the plant to feed on plant fluids. Note the whitish cast skins.

Photo Source: Michael Bush, Washington State University Extension, Yakima, WA