Tephrochlamys Loew, 1862

Zeng, Wei, Ma, Fangzhou & Yang, Ding, 2024, Three new species of Tephrochlamys Loew (Diptera: Heleomyzidae: Heteromyzinae) from Oriental China, with a key to the Oriental species, Zootaxa 5493 (5), pp. 577-589 : 578

Tephrochlamys Loew, 1862

Tephrochlamys Loew, 1862: 128 . Type species: Helomyza rufiventris Meigen, 1830 .

Key to the Oriental species of Tephrochlamys

1. Length of anterior pair of fronto-orbital setae is at most 0.25 times length of posterior pair, distinctly short and slender, emerging from small circle, almost indistinguishable from the surrounding smaller setae ( Figs. 17, 18 )...... T. javanensis Frey, 1934

- Length of anterior pair of fronto-orbital setae is at least 0.5 times length of posterior pair............................ 2

2. Abdomen entirely black, dusted with greenish-gray, the sternites with black anterior margins ( Figs. 40, 41 ).............................................................................................. T. fasciata Czerny, 1924

- Abdomen ash-grey, yellow or yellowish brown, the sternites without black anterior margins, uniformly colored or with posterior darkening........................................................................................... 3

3. Wings distinctly clouded along costal vein ( Okadome, 1997)............................ T. japonica Okadome, 1967

- Wings not distinctly clouded along costal vein.............................................................. 4

4. Mesonotum with 6 somewhat irregular rows of acrostichal setae after suture ( Fig. 21 ).............................. 5

- Mesonotum with 4 somewhat irregular rows of acrostichal setae after suture ( Figs. 2 , 29 )............................ 6

5. Crossvein CuA, CuA+CuP and bm-m with variegated yellow and brown patterns on the veins ( Fig. 24 )................................................................................................... T. variegata sp. nov.

- Crossveins without variegated pattern.............................................. T. rufiventris ( Meigen, 1830)

6. Dorsal side of first flagellomere flat (visible in lateral view; Fig. 31 ); crossveins r-m and dm-m with infuscate markings on the membrane ( Fig. 32 )...................................................................... T. pengi sp. nov.

- Dorsal side of first flagellomere not flat (visible in lateral view; Fig. 3 ); crossveins r-m and dm-m without obvious dark markings on the membrane......................................................... T. wuyishanensis sp. nov.

Figures

FIGURES 16–19. Tephrochlamys javanensis Frey, female holotype (Naturhistorisches Museum Basel, photo taken by Sarah Müller). Habitus, lateral view (16). Head, lateral view (17) and dorsal view (18). Wing (19). Scale bar = 1.0 mm.

FIGURES 40–41. Tephrochlamys fasciata Czerny, female holotype (Naturhistorisches Museum Wien, photo taken by Alexssandro Camargo). Habitus, dorsal view (40) and lateral view (41). Scale bar = 1.0 mm.

FIGURES 20–24. Tephrochlamys variegata sp. nov., female. Habitus, lateral view (20). Mesoscutum, dorsal view (21). Head, lateral view (22) and dorsal view (23). Wing (24). Scale bar = 1.0 mm.

FIGURES 1–4. Tephrochlamys wuyishanensis sp. nov., male. Habitus, lateral view (1). Mesoscutum, dorsal view (2). Head, lateral view (3) and dorsal view (4). Scale bar = 1.0 mm.

FIGURES 28–32. Tephrochlamys pengi sp. nov., male. Habitus, lateral view (28). Mesoscutum, dorsal view (29). Habitus, dorsal view (30). Head, lateral view (31). Wing (32). Scale bar = 1.0 mm.