Megaselia culmenensis n. sp.

(Figs 1–11)

Diagnosis. In the keys of Lundbeck (1922) it runs to Group IV couplet 4, but its hypopygium is different from both options. In the key to the males of species from the British Isles (Disney, 1989) it runs to couplet 121 and in Schmitz’s (1958) key for Abteilung IV Erste Reihe it runs to couplet 18, but in both cases is excluded by its distinctive hypopygium. Likewise in Borgmeier’s (1964b) key Group IV it runs to couplet 20 lead 1.

`Description. Male. Frons as Fig. 1, with dense but very fine microtrichia. Cheek with 6 robust bristles and jowl with 2 that are longer and even more robust. Postpedicels, with a few SPS vesicles (Fig. 3), palps and proboscis as Fig. 2, the labella lacking short spinules below. Thorax (Fig. 4) with 3 notopleural bristles and no cleft in front of these, mesopleuron with hairs and scutellum with an anterior pair of hairs and a posterior pair of bristles.Abdominal tergites as Fig. 5. Venter brown, and with hairs on segments 3–6. Hypopygium as Figs 6–8. Legs brown but front leg more yellowish brown. Fore tarsus (Fig. 9) with posterodorsal hair palisades on segments 1–5 and 5 clearly longer than 4. Dorsal hair palisade of mid tibia extends about 0.78 times its length. Hairs below basal half of hind femur subequal to those of anteroventral row of outer half (Fig. 10). Hind tibia with 7–8 differentiated posterodorsal bristles, without anterodorsals, and spinules of apical comb simple. Wings (Fig. 11) 1.14 mm long. Costal index 0.49. Costal ratios 4: 2.3: 1. Costal cilia (of section 3) 0.07 mm long. Vein 3 with hair (but only its sockets present on both wings). 2 axillary bristles, the outermost being 0.07 mm long. Sc not reaching R1. Halteree brown.

Type material. Holotype male, DENMARK, DK EJ, Nørre Onsild Mose, 24.VII–8.VIII.2017, Esben Bøggild (UCMZ —9–14).

Etymology. Named after unusually short roof (culmen) of the epandrium.