Key to males and females of Tarnania
1 Mesonotal
stripes distinct; point of furcation of CuA opposite or beyond base of
crossvein ta; vertex and frons uniformly dark; mid and hind coxa usually with
indistinct dark marks medially; abdominal tergite III and IV often granulated
with large dark spots in the pale apical area; male terminalia as large as or
larger than abdominal segment VI. 2
– Mesonotal
stripes indistinct or absent; point of furcation of CuA before base of
crossvein ta; vertex pale, frons contrasting darker in front of lateral ocelli;
mid and hind coxa usually with distinct dark marks medially; abdominal tergite
III and IV not granulated with large dark spots in the pale apical area, if
slightly granulated, then with small dark spots; male terminalia smaller than
abdominal segment VI. 3
2 Overall
coloration dark reddish brown, with sharply defined mesonotal stripes, narrowly
surrounded by pale ground that usually gets darker towards the humeral area;
laterotergite reddish brown. Male hypandrial lobe wide subquadrangular in
ventral view, without constriction except at extreme tip. Male cercus long,
slender. Female cercus II slender, 3.5 - 4.6 times as long as wide. Tarnania
dziedzickii Edwards
– Overall
coloration yellowish brown, with less sharply defined mesonotal stripes on
uniformly pale ground extending to humeral area; laterotergite pale yellow.
Male hypandrial lobe in ventral view basally tapering into a large, constricted,
apical hook. Male cercus less slender, distinctly broader basally. Female
cercus II short ovate, 2.5 to 3 times as long as wide. Tarnania fenestralis Meigen
3 Only
one strong propleural bristle present; antenna longer, second flagellomere
about 1.3 as long as wide. Basal third of male hypandrial lobe rectangular in
ventral view, then abruptly constricted into a long, narrow cylindrical process
with a large apical hook. Female cercus II slender, 3.5–4 times as long as wide. Tarnania
nemoralis Edwards
– One
strong and one lesser propleural bristle present; antenna shorter, second
flagellomere about as long as wide. Male hypandrial lobe in ventral view with
basal half to two thirds wide rectangular, then abruptly constricted into a
short pointed plate with a less distinct apical hook. Female cercus II short
ovate, 2–3.5 times as long as wide. Tarnania
tarnanii (Dziedzicki)