Speckled Dun

Callibaetis pictus is a species of small minnow mayfly in the family Baetidae. It is found in Central America and North America. In North America its range includes all of Mexico, the northern, and southwestern United States. It can be distinguished from other species in its range by its pale, usually W-shaped dorsal marking on tergite 6. Very similar markings are almost always present on tergites 5 and 9 as well.