Plecia rhenana Heyden & Heyden, 1865 (figs. 55, 158–159)

Plecia rhenana Heyden & Heyden 1865: 28–29 .

Localities: Rott. Also in Aix-en-Provence, France.

Female redescribed by Skartveit & Nel (2017).

Material examined: Holotype (female) NHMUK In 38798 (fig. 55).

Description:

Female (N=1, figs. 55, 158–159):

Total length 9.1 mm.

Head (fig.159): Length 1.01 mm, width 1.01 mm, complex eye rather large and flat. Antenna slender, flagellum 0.65 mm long, 0.15 mm wide, 8-segmented.

Thorax: Length 2.5 mm, width 2.0 mm, dark brown, haltere dark brown.

Legs: Slender. Just apical part of tibia and tarsus of fore and mid legs preserved. Tibiae apparently pale, tarsi dark brown. Fore tibia 1.9 mm long.

Wing (fig. 158): Length 9.3 mm, width 3.3 mm, length/width = 2.8. Light brownish fumose, rather narrow and a little pointed. Veins brown, pterostigma oval, brown, quite distinctive. Humeral vein present. Subcosta running close to R but distinctive. Costa extends to a little beyond apex of R 4+5. R 2+3 oblique, gently, evenly curved. R 4+5 apically gently curved. R-M vertical. Fork of M asymmetrical, rounded. CuA 2 apically distinctly curved basad. CuP fine, curved, running some distance from CuA and parallel to this vein. Vein measurements are given in Table 4.

Abdomen: 5.8 mm long, 2.4 mm wide.

Discussion:

This name obviously has meant different things to different authors. Plecia rhenana sensu Statz is not P. rhenana Heyden & Heyden. It differs from the holotype in having darkened, not hyaline, wings, being much larger and having a pseudovein along CuA.The holotype female has a wing length of 9.3 mm, whereas a specimen of Plecia rhenana sensu Statz is a very large Plecia with a wing length of 13.7 mm.