Adults of Camelobaetidius waltzi (Ephemeroptera : Baetidae), with field notes

Adult males and females of Camelobaetidius waltzi (Ephemeroptera: Baetidae) are described for the first time. Previously, the species was known from l arvae collected in Indiana, Iowa, and Texas. Adults were reared from popula tions in southeast Nebraska. Although the reliability of species-level char acters in adult Camelobaetidius is uncertain, males of C. waltzi appear sep arable from sympatric species based on shape and color of the turbinate eye s and on abdominal coloration. Females are similar to males in wing and fem oral coloration. Larvae were found in areas with current velocities greater than 0.52 m/ sec and with a pH range of 8.5 to 9.0. Subimagos were observe d emerging from eddies within riffle areas at dusk.