Megaselia helleorumae sp. n.

(Figs 54–62)

Material examined. Holotype male, DENMARK, Dk NEJ, Døstrup Simested Å, 31.v.–17.vi.2016, Esben Bøggild (CUMZ-8-61). Description. Male. Frons as Fig. 54, and with dense microtrichia. Cheek with 3 bristles and jowl with 2 that are longer and more robust. Postpedicels, which lack SPS vesicles, palps and proboscis as Fig. 55. Ventral face of proboscis as Fig. 56. Thorax brown, with 2 notopleural bristles and no cleft in front of these. Mesopleuron bare. Scutellum with an anterior pair of small hairs and a posterior pair of bristles. Abdominal tergites 3–6 as Fig. 57. Venter gray, and with hairs on segments 3–6. Hypopygium as Figs 58 & 59, with a pale left hypandrial lobe with microtrichia. The right lobe vestigial but with microtrichia. Legs dusky yellow. Fore tarsus (Fig. 60) with a posterodorsal hair palisade on segments 1–4. Dorsal hair palisade of mid tibia extends about 0.75 times its length. Hind femur as Fig. 61. Hind tibia with about 10 differentiated posterodorsal hairs, without anterodorsals, and spinules of apical combs simple. Wings (Fig. 62) 2.01 mm long. Costal index 0.45. Costal ratios 4.06: 2.11: 1. Costal cilia (of section 3) 0.12 mm long. Vein 3 with hair at base of 0.04 mm length. With 4 axillary bristles, the outermost being 0.14–0.15 mm long. Sc not reaching R1. Haltere knob pale.

Recognition. In the key of Lundbeck (1922) to Group VI it runs to couplet 31 where neither option fits. In the key to the males of the British species (Disney, 1989) it runs to triplet 218, but its hypopygium differs from all three species. A further nine species will run to the same triplet, but all differ in their hypopygia plus one or more characters, e.g. vein 3 unforked, notopleuron with a cleft, popstpedicels with SPS vesicles.

Etymology. Named after Helle Ørum a close colleague of Esben Bøggild.