Mayfly Species Callibaetis floridanus (Speckled Duns)

A uniformly ferruginous species; cross veins of fore wing few in number; marginal intercalaries single; male not known.

Thorax ferruginous. Femora thickly dotted with brown; 10 to 15 large dots on the middle line of each, as well as many smaller ones on each side. Tarsal joints brown apically. Cross veins of fore wing few, only about 20 behind the vitta; marginal intercalaries, in the type specimen, occur singly except at the tip. Costal brace red-brown, with a clear space immediately beyond; this is followed by U-shaped bars of brown. “Costa of wing unmarked; basal costal region hyaline, vitta pale brownish, broader at base, with about seven or eight small narrow indentations on hind edge, otherwise the edge is very regular" (Banks). Cross veins in middle of wing brownish. Hind wing relatively short for its width, the costal margin nearly straight on each side of the costal projection. Cross veins rather few in number; usually one well-developed intercalary only; veins 2 and 3 convergent toward the tip. Abdomen uniformly ferruginous; tails pale, narrowly brown at the joinings.