Mayfly Species Rhithrogena fasciata

A rather small pale species, allied in type of genitalia to Rhithrogena anomala.

Head pale yellow; clypeus colorless, hyaline; small black spot at base of antenna; small black spot on each side beneath clypeus. Purplish area around base of antenna, which is whitish; base of filament smoky, tip white. Pronotum deeply emarginate posteriorly; yellowish orange. Mesonotum pale yellow, brown on each side of scutellum. Metanotum brown. Pleura pale with ochreous markings. Venter pale ochreous; posterior portion of mesosternum tinged with brown. Legs yellowish brown, femora deeper brown; round purplish spot at center of each femur. All joinings narrowly dark purplish. Wings semi-hyaline; longitudinal veins yellowish to yellow-brown, cross veins colorless. Abdominal segments smoky, some with ochreous tinge. Segments 1 and 2 pale, very faintly smoky; 3-6 deeper smoky, with distinct lavender tinge; 7-10 tinged with pale ochreous. Posterior margins of all tergites dull pale lavender, so that abdomen appears banded. Indistinct pale submedian dashes and pale median line on tergites 2-7. Sternites pale, immaculate; no dark banding. Genitalia pale brown; penes quite similar in form to R. anomala (see fig. 102). Tails whitish, not darker at joinings.