Megaselia vestfoldensis n. sp.

(Figs 57–65)

Diagnosis (male). In the key to the males of Megaselia from the British Isles (Disney 1989) it runs to couplet 214 then by a return loop to couplet 156, where the hypopygium differs from both options. However, this group of species was revised by Buck & Disney (2001). In their key it runs to couplet 7 lead 2 – undescribed species – at least 4 species requiring better specimens.

Male. Frons as Fig. 57, with very fine microtrichia but mainly towards the edges and next the median furrow. Cheek with 4 bristles and jowl with 2 that are much longer and 58, the postpediocels with numerous SPS vesicles. Thorax brown. Two notopleural bristles and a cleft in front of these (Fig. 59). Mesopleuron bare. Scutellum with an anterior pair of small hairs and a posterior pair of bristles. Abdominal tergites and venter as Fig. 60, the latter with hairs on segments 3–6. Hypopygium as Figs 61–62, the hypandrium lacking a right lobe. Legs brown. Fore tarsus with posterodorsal hair palisade on segments 1–4 and 5 clearly longer than 4 (Fig. 61). Dorsal hair palisade of mid tibia extends about 0.79 times its length. Hairs below basal half of hind femur subequal to those of anteroventral row of outer half (Fig. 64. Hind tibia (Fig. 64) with a dozen differentiated posterodorsal robust bristles apart from the first 2–3 being more much finer, without anterodorsals, and spinules of apical combs simple. Wings (Fig. 65) 1.23 mm long. Costal index 0.41. Costal ratios 2.97: 1.40: 1. Costal cilia (of section 3) 0.07 mm long. Vein 3 hair 0.06 mm long. 3 axillary bristles, the outermost being 0.09 mm long. Sc not reaching R1. Haltere pale whitish yellow.

Material. Holotype male, Norway, Vestfold, Horten, 59.3656º N, 10.4606º E; 18 Jul 2018, J. Svetlik & L. Børjia (11A, UCMZ, 39–92).

Etymology. Named after the type locality.