Plecia proserpina ( Heyden & Heyden, 1865 )

Skartveit, John & Wedmann, Sonja, 2021, A Revision of fossil Bibionidae (Insecta: Diptera) from the Oligocene of Germany, Zootaxa 4909 (1), pp. 1-77 : 34-35

Plecia proserpina ( Heyden & Heyden, 1865) (figs. 54, 156–157)

Protomyia proserpina Heyden & Heyden 1865: 22–23 .

Localities: Rott.

Material examined: Holotype (female) NHMUK In 58793 (fig. 54)

Additional material: LACMIP 2533.285/ LACMIP Type 3417, 2533.1167

Description:

Female (N=5, figs. 54, 156–157):

Total length 5.5–7.5 mm (N=5)

Head: Length 0.64–0.79 mm (N=3), width 0.64–0.82 mm (N=3). Black. Antenna cylindrical, flagellum 0.38– 0.41 mm long, 0.09–0.11 mm wide (N=3), 7- or 8-segmented.

Thorax: Length 1.4–2.1 mm (N=4), width 1.7–1.8 mm (N=2), blackish-brown.

Legs: Femora brownish-yellow with dark tips, hind femur very narrowly so. Fore- and mid-tibiae blackish, hind tibia brownish-yellow with brown tip, two fine, straight, brown spurs, about one-fifth the length of first tarsomere. All tarsi dark brown and slender. Fore femur 1.7 mm long, 0.35 mm wide (N=1), fore tibia 1.2–1.8 mm long, 0.17–0.23 mm wide (N=3), fore first tarsomere 0.62–1.00 mm long (N=2), hind tibia 2.3 mm long (N=1), hind first tarsomere 0.86 mm long (N=1).

Wing (fig. 157): Length 4.8–7.1 mm, width 1.8–2.6 mm, length/width = 2.7–3.0 (N=4). Brown fumose, costal cell darkened. Pterostigma indistinctive. Veins brown, rather fine. Humeral vein present, oblique. Subcosta straight, rather strong. Costa extends a little beyond apex of R 4+5. R 2+3 medium-length, oblique, rather straight. R 4+5 apically rather strongly curved. R-M a little oblique. M-veins apically gently curved, fork of M rather narrow. CuA 1 relatively short, strongly curved. CuP distinctive, curved, running well separated from CuA. Vein Measurements are given in Table 4.

Abdomen: Length 3.7–4.9 mm (N=5), width 2.0– 2.1 mm (N=4). Blackish-brown, rather stout, spindle-shaped. Last sternite with deep, V-shaped cleft.

Male unknown.