Mayfly Species Rhithrogena uhari

A small pale species.

Female imago pale yellowish. A black mark below antenna; faint brownish markings above frontal margin; base of antenna white; basal portion of filament dark, remainder light brown. Thoracic notum yellowish; metanotum yellow-brown, darker posteriorly. Small dark spot near center of lateral margin of pronotum. Faint purplish shading near wing bases; brown shading on each side of scutellum. Pleura paler than notum; purplish marks below wing roots; faint dark lines above bases of middle and hind legs. Sternum pale, mesosternum yellow. Legs pale whitish. Small round black spot at center of each femur. Tarsi smoky, with black spot dorsally at each joining. Wings semi-hyaline whitish, with faint milky tinge. Opaque cloud in stigmatic area. Venation whitish. Abdominal tergites light yellowish brown; 1-5 with purplish posterior margins; 6-10 more yellow, unbanded. Pleural fold whitish. Sternites pale yellow, immaculate. Tails pale yellow, joinings opaque. Female very similar to Rhithrogena exilis and R. fuscifrons; abdominal tergites rather darker than in the former, general color paler than the latter.