Anglers in western Wisconsin, where these little flies hatch in good numbers on summer rivers, have termed them "Darth Vaders" because of the very dark color of their wings.
» Species deficiens (Little Black Quill)
Until recently, this species was known as Serratella deficiens. Where & When
Regions:Most writers say this species emerges in June and July, but Caucci and Nastasi in Hatches II report that it is important in the Catskills in the late summer and fall. The others might be referring to hatches in the Midwest, where the species is also prolific, or there may be some confusion between species.Hatching Behavior
East, MidwestTime Of Year (?):
June and July
Time Of Day (?):The tiny duns take a while to break through the surface film, and then they linger on the surface before flying off. Despite their small size they can provide excellent fishing where they are abundant.
The angling literature says they hatch in late morning, and anglers familiar with the hatch confirm this, but they also report afternoon and evening hatches.Spinner BehaviorThese spinner falls are unimportant.Nymph BiologyCurrent Speed: Slow to medium
Substrate: They do especially well in weedy streams.
Pictures of 1 Mayfly Specimen in the Species Teloganopsis deficiens:
Teloganopsis deficiens (Little Black Quill) Mayfly Nymph
View 6 PicturesThis nymph has tiny, barely detectable tubercles (
Tubercle: Various peculiar little bumps or projections on an insect. Their character is important for the identification of many kinds of insects, such as the nymphs of Ephemerellidae mayflies.) on its abdominal segments, and I could not find the maxillary palpi. I have tentatively guessed that it is Serratella deficiens.
A few (not all) of the abdominal tubercles on this Ephemerella needhami
nymph are circled. They are especially large in this species.
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