Ephemeroptera: Heptageniidae of Gunnison County, ColoradoRhithrogena undulata (Banks) 1924
Small Western Red Quill, Red Quill
Updated 19 Nov 2008
Good Links
On this website:
Introduction to Rhithrogena
Other Websites:
Mayflies of Colorado distribution map (USGS) Coordinated by Boris Kondratieff
http://www.npwrc.usgs.gov/resource/distr/insects/mfly/usa/317.htm
References
Banks, N. 1924 Descriptions of new neuropteroid insects. Bulletin of the Museum of Comparative Zoology. 65(12):419-455, pl. 1-4.
Described as Epeorus undulata on page 425 and illustration of ventral view of male genitalia as Figure 57:
 
Edmunds GF Jr. 1995 Habitat differences between northern and southern populations of mayflies of the western United States. Pages 171-176 in Corkum LD; Ciborowski JJH. Current Directions in Research on Ephemeroptera. Canadian Scholars' Press, Inc. Toronto.
Copied from pages 172 and 173:
 
McCafferty,WP; Durfee,RS; Kondratieff,BC 1993 Colorado mayflies (Ephemeroptera): an annotated inventory. Southwestern Naturalist 38 3, 252-274. PDF
Quote from page 262: "This species appears to be limited to the western slope in Colorado, and it shows considerable color variation throughout its range. It, as well as R. plana and R. vitta described by Allen and Chao (1987a) from Arizona, will likely prove to be variants of R. morrisoni (Banks). Rhitrogena morrisoni has one page priority over R. undulata (see Banks, 1924) and has been reported from Arizona, California, Nevada, New Mexico, and Utah. In addition, the first author has seen specimens from Idaho and Wyoming. "
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