Megaselia ehmsenae n. sp.

(Figs 47–60)

In Diagnosis. In the key of Lundbeck (1922) to Group I it runs to couplet 31 but both species are covered in the key to the males of the British species (Disney, 1989) where it runs to couplets 159 and 160. However, this complex was revised by Buck & Disney (2001) in which it runs to couplet 11 lead 1, where its hypopygium differs from both options. The subsequently described M. fallobreviseta Disney (2011e) runs to the same point. It has paler wings and the labella of the proboscis lack spinules below. In the key of Schmitz & Delage (1981) it runs to couplet 38 lead 1, both species being covered by Buck & Disney’s revision. Of two other species running the same point one has a yellow thorax and the other brown Halteres. It fails to run down in keys for the rest of the world’s fauna and subsequent additions.

Description. Male. Head as Fig. 47. Frons as Fig. 48, with dense but very fine microtrichia over most of it (Fig. 49) and its breadth about 1.7 times its length. Cheek with 6 bristles and jowl with 2 that are longer and more robust. Postpedicels as Fig. 50, with a few small SPS vesicles (at most 0.006 mm diameter). Palps yellow (Fig. 47). Proboscis as Fig. 47, the labella with some short spinules below (Fig. 51). Thorax brown. Two notopleural bristles and no cleft in front of these, and mesopleuron bare (Fig. 52). Scutellum with 4 bristles that are subequal in length (Fig. 53). Abdominal tergites brown with moderate hairs that a little longer at rear of T6 (Fig. 54). Venter gray, and with hairs on segments 3–6. Hypopygium as Figs 54–56, the pale hypandrial lobes are subequal in length and with microsetae. Hind legs brown and the rest progressively yellowish to yellow. Fore tarsus (Fig. 57) with posterodorsal hair palisade on segments 1–5 and 5 longer than 4. Dorsal hair palisade of mid tibia extends about 0.67 times its length. Hairs below basal half of hind femur clearly longer than those of antero-ventral row of outer half (Fig. 58). Hind tibia with about a dozen moderately differentiated posterodorsal hairs, without anterodorsals, and spinules of apical combs simple. Wings pale (Fig. 59–60) 1.50 mm long. Costal index 0.46. Costal ratios 3.7: 1.7: 1. Costal cilia (of section 3) 0.11 mm long. Vein 3 without hair at base. 4 axillary bristles, the outermost being 0.12 mm long. Sc fading as it almost reaches R1. Haltere knob pale (Fig. 52).

Type material Holotype male, DENMARK, DK SJ, Draved Skov, 17.V.–14.VI.-2014, Esben Bøggild (UCMZ —9–25).

Etymology. Named after Kirsten Ehmsen. It should be noted that the name Triphleba ehmseni (Disney & Bøggild, 2019) was mistakenly referred to Erhardt & Kirsten Ehmsen, but in fact was named after Erhardt only.