Mayfly Species Apobaetis futilis (Tiny Blue-Winged Olives)

Abdominal tergites of male imago clay-brown.

Turbinate eyes rather lengthily oval, well separated; light olive or greenish brown in dried specimen. Head brownish between the eyes; antennae pale smoky. Thorax deep clay-brown; traces of ruddy shading on the pleural sutures; scutellum of the mesonotum, and anterior portion of metanotum paler. Legs dull dirty whitish. Wings hyaline, venation pale. 4 or 5 oblique cross veins in the stigmatic area, with no granulations between them; paired intercalaries rather long and well developed except in the first and second interspaces. Abdominal tergites 2-6 clay-brown, very similar in color to the thorax; the triangular portion of tergite 1 paler, more ochreous. Tergites 7-10 paler, rather ochreous; traces of ruddy lateral shading, on some specimens; Sternites considerably paler, the apical ones shading into cream-color, with traces of ruddy streaks on the lateral margin. Tails pale; forceps pale creamy, widely separated at the base.

The shape and color of the eyes and the clay-brown of thorax and abdomen separate this species from P. turbidum (now a synonym of Acentrella turbida) and P. carolina (now a synonym of Acentrella turbida).