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Hybos femoratus
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Subspecies
Original
description
Synonyms
Asilus femoratus
Müller, 1776
Hybos femoratus (Müller, 1776)
Empis nigra De Villers, 1789 (p. 571) (nomen dubium; see note)
Hybos flavipes Meigen, 1804
Hybos fumipennis Meigen, 1820
Note: Empis nigra is a nomen dubium that usually is placed as an
unidentified species of Empis in the Empidae. However, I argue that
Empis nigra is likely a member of the genus Hybos and place it in the
synonymy of the present species, because most details of the original
description fit Hybos femoratus:
a) "Parva" ("small"): De Villers compared this species to other species
of his genus "Empis" that includes also true Empis (in the modern
sense), which are much larger than representatives of Hybos. Thus,
compared to true Empis species, Hybos species can indeed be called
"small".
b) "Oculi rubri" ("eyes red"): fits all German Hybos species.
c) "Antennae nigrae" ("antennae black"): fits all German Hybos species.
d) "Rostrum testaceum" ("rostrum brick-red"): does not fit any German
Hybos species, but generally difficult to see. Maybe De Viller´s
specimen was already faded and thus the labrum appeared lighter, or De
Villers used the term "rostrum" for another portion of the mouthparts
e.g. the palps, which indeed may be brownish in some specimens of the
present species.
e) "Thorax & abdomen nigra" ("thorax and abdomen black"): fits all German species of Hybos.
f) "Alae magnae diaphanae, basi ferrugineae" ("wings large, transparent, at the base rust-red"): fits Hybos femoratus exactly.
g) "Femora postica fusca, incrassata" ("hind femura dark, swollen"): the
enlarged hind femur is actually the typical feature of the genus Hybos.
The hind femur is dark in all German species of the genus.
h) "Tibiae testaceae" ("tibiae brick-red"): largely fits Hybos
femoratus: the hind tibiae are black, but the middle and fore tibiae are
reddish brown. The other two German species have black tibiae on all
legs.
Identification
Distribution
Biology
This page has been updated on September 3, 2014
This site is online since May 31, 2005
Copyright © by Nikola-Michael Prpic. All
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