Tarnania dziedzickii (Edwards, 1941)

Diagnosis. – Apart from the coloration as given in the key to species the male can be separated from other Tarnania primarily by the shape of the hypandrial lobe,
which in ventral view is subrectangular and parallel-sided for most of its
length, except at extreme tip where it is constricted to a tiny, pointed apex. Further diagnostic characters of the male include: The ventral
branch of the gonostylus usually having a distinct protrusion apicodorsally and
short setae internally on apical half; the median branch being evenly
broad towards apex; the cercus being slender, without dorsal widening
basomedially; and the aedeagus being narrow triangular .
The female is best separated from other Tarnania by the combination of dark coloration,
having narrowly pointed gonapophysis VIII and long, slender cercus II.

Description

Male (n = 5, except where otherwise stated). Total length 7
– 8, 7.3 mm. Wing length 3.84 – 4.38, 4.12 mm, or 3.33 – 3.47, 3.4 x as long as
profemur. Mesonotum length 1.04 – 1.24, 1.11 mm, or 0.26 – 0.28, 0.27 x as long
as wing.

– Coloration
(fresh animal in alcohol). Antenna with scape and pedicel light brown, basal
half of first flagellomere light yellow, rest of flagellum uniformly brown.
Head reddish brown, also on postgena; clypeus reddish brown, maxillary palp
yellow. Thorax with sharply defined mesonotal stripes narrowly surrounded by
pale yellow ground graduated towards darker reddish brown humeral areas;
Antepronotum, proepisternum, anepisternum, lower two thirds of katepisternum,
upper part of anepimeron, laterotergite, mediotergite and metepisternum reddish
brown. Wings unmarked;
yellow tinted, especially in costal and radial sector; wing veins yellow with
dark setae. Halter whitish. Legs mainly yellow; fore coxa brownish basally; mid
and hind coxae yellow, with large but diffuse brownish spot medially. Abdomen
mainly reddish brown with narrow yellow bands apically, tergites III and IV with
reddish yellow triangular area lateroapically granulated with large dark spots;
tergite VI dark brown; sternites gradually darker towards terminalia;
terminalia yellow basally, reddish brown apically; tergite IX and cercus
yellow.

– Head round, width / length to frontal tubercle 1.26 –
1.54, 1.41. Antenna 1.5 – 1.86 (n=3) mm long. First flagellomere 1.62 – 1.81,
1.72 times as long as second flagellomere. Second flagellomere 1.5 – 1.7, 1.6
times as long as wide. Length / width of clypeus 0.66 – 0.89, 0.76.
Antepenultimate palpomere 0.15 – 0.19, 0.17 mm long, palpomere ratios 1: 1.23 –
1.41, 1.29: 2.73 – 3.04, 2.88.

– Thorax. One strong proepisternal bristle.

– Wings. Wing length to length of R₁ 2 – 2.17,
2.09. R₅ slightly sinusoid, wing length to length of R₅
1.61 – 1.68, 1.65. Length of ta to length of M-petiole 1.15 – 1.43,
1.29. Fork length ratio (A/B) 0.99 – 1.09, 1.05. Fork width ratios (C/D and
E/F) 2 – 2.4, 2.17 and 0.7 – 0.86, 0.76. M-ratios 0.58 – 0.64, 0.61 and 0.64 –
0.7, 0.66. CuA-ratios 0.69 – 0.84, 0.75 and 0.9 – 1.09, 0.97. CuP length to
length of wing 0.55 – 0.69, 0.59. A₁ length to length of wing 0.45 –
0.48, 0.47.

– Legs. Leg ratios given for fore, mid and hind leg: LR 0.95
– 1.03, 0.99: 0.97 – 1.04, 0.99: 0.75 – 0.79, 0.78; SV 1.94 – 2.1, 2.01: 1.92 –
2.04, 1.99: 2.29 – 2.39, 2.34; BV 1.64 – 1.81, 1.76: 2.02 – 2.15, 2.07: 2.66 –
2.91, 2.76; TR 1.48 – 1.63, 1.55: 1.74 – 1.91, 1.82: 2.11 – 2.25, 2.16.

– Terminalia. Genitalia as large as or larger than
abdominal segment VI. Tergite IX distinctly shorter than wide,
covered with relatively few setae. Cercus narrow, slender, 5 – 5.94 (n=4) as
long as wide in dorsal view; without dorsal widening basomedially. Aedeagus narrow
triangular, with deep medial invagination apically. Hypandrial lobe
in ventral view a long subrectangular and parallel-sided plate, without
constriction except at extreme tip; in lateral view with small,
distinct hook apically. Gonostylus with dorsointernal
branch fan-shaped; median branch evenly broad towards apex, apically with
short, lanceolate seta; ventral branch usually with distinct protrusion
apicodorsally, with short setae internally on apical half.

 Female (n = 5, except where otherwise stated). Total length
7.5 – 9.5, 8.2 mm. Wing length 4.2 – 5.24, 4.71 mm, or 3.23 – 3.53, 3.41 x as
long as profemur. Mesonotum length 1.14 – 1.5, 1.32 mm, or 0.27 – 0.29, 0.28 x
as long as wing.

– Coloration. (fresh animal in alcohol). As for male, except
abdominal tergites III - VI with larger, subrectangular reddish yellow areas
laterally, more heavily granulated with large dark spots; tergite VII and
terminalia reddish yellow.

– Head round, width / length to frontal tubercle 1.22 –
1.56, 1.39. Antenna short, 1.8 – 2.2, 1.96 mm long. First flagellomere 1.62 –
2.09, 1.82 times as long as second flagellomere. Second flagellomere 1.6 –
1.77, 1.68 times as long as wide. Length / width of clypeus 0.64 – 0.77, 0.7.
Antepenultimate palpomere 0.16 – 0.21, 0.19 mm long, palpomere ratios 1: 1.23 –
1.5, 1.37: 2.58 – 3.1, 2.83.

– Thorax. One strong proepisternal bristle.

– Wings. Wing length to length of R₁ 1.98 – 2.09,
2.04. R₅ slightly sinusoid, wing length to length of R₅
1.61 – 1.67, 1.63. Crossvein ta with small, distinct white spot. Length of ta
to length of M-petiole 1.05 – 1.43, 1.27. Fork length ratio
(A/B) 0.82 – 1.14, 1.02. Fork width ratios (C/D and E/F) 1.79 – 2.33, 2.15 and
0.57 – 0.79, 0.68. M-ratios 0.57 – 0.59, 0.58 and 0.62 – 0.65, 0.63. CuA-ratios
0.63 – 1.01, 0.75 and 0.8 – 1.33, 0.98. CuP length to length of wing 0.55 –
0.58, 0.57. A₁ length to length of wing 0.43 – 0.46, 0.45.

– Legs. Leg ratios given for fore, mid and hind leg: LR 0.97
– 1.02, 0.99: 0.98 – 1.01, 0.99: 0.77 – 0.85, 0.79; SV 1.98 – 2.03, 2.01: 1.97
– 2.05, 2: 2.22 – 2.4, 2.31; BV 1.72 – 1.91, 1.82: 2.01 – 2.14, 2.1: 2.75 –
2.98, 2.88; TR 1.56 – 1.71, 1.62: 1.74 – 1.88, 1.82: 2.19 – 2.31, 2.24.

– Terminalia. Cercus I conical.
Cercus II slender, 3.53 – 4.58, 4.29 as long as wide in lateral view.
Gonapophysis VIII narrowly pointed towards apex; apicodorsal margin usually
distinct sinusoid.