Mayfly Species Teloganopsis deficiens (Little black Quills)

A member of the serrata (now a synonym of Serratella serrata) group; distinguished fromE. sordida (now a synonym of Serratella serrata), in the male imago, by the deep blackish brown abdominal tergites, the prominent dark apical spot on the middle and hind femora, and the blackish apical portion of the penes. Head and thorax blackish brown. Eyes reddish brown, antennae brown. Vertex of head in female deep wine-red. Pronotum brown; mesothorax and metathorax brown, likewise the pleura, all with blackish markings. Sternum brown. Coxae brown; legs nearly white, the femora with a prominent dark brown spot apically, especially prominent on the middle and hind legs. Wings hyaline, veins pale; brown shading at base of wings. Abdominal tergites deep blackish brown; sternites paler. Tails pale, the joinings narrowly but distinctly purplish brown. Forceps pale; penes whitish basally, blackish apically (see fig. 156).

Nymph blackish (rarely dull brown), usually with a pale median thoracic stripe dorsally. Head and thorax smooth; maxillary palp entirely wanting; no dorsal abdominal spines. Lateral extensions of the abdominal segments and postero-lateral spines only moderately developed; tips of the spines whitish. Gills present on segments 3-7. Each claw with 8-9 denticles. Tails yellowish brown; a wide dark median band crosses the two outer ones; at each joining, a circle of prominent spines. Femora dark brown, tibiae and tarsi yellowish with wide brown bands. Two pale spots laterally on each side of the pronotum.