Hydrotaea meteorica, Linnaeus, 1758

Vikhrev, Nikita E., 2023, Review of the Hydrotaea meteorica group (Diptera, Muscidae), Amurian Zoological Journal XV (4), pp. 838-846 : 844-845

Key to the males of Hydrotaea meteorica group

1. Arista slightly thickened; the second quarter of arista whitish; aristal setulae very short. Vibrissae short, straight and thickened; under vibrissae there is a vertical row of 4 short, straight and thickened setae ( Fig. 2 ). f2 beyond middle with 2 long av and 2 long strong pv; tar2-1 and tar2-2 with dense ventral hairs ( Fig. 3 ).. spinigena Xue & Li

— Without modifications described above.. ....................................... 2

2. t3 at apical quarter with a row of 4–6 long apically down-curved pv setae ( Fig. 5 ). Upper parafacial glossy black. (f2 with a row of 7–9 ventral spines, these are weak and almost twice shorter than femur width. f3 ventrally bare except for 3–4 strong av at apical quarter. t 3 in middle with a row of 3–4 stright pv setulae, with or without av, without ad and pd. Notopleuron bare. Body length 4.5–5 mm)...... affinis Karl

— t3 without long pv setae at apical quarter. Parafacialentirelydusted............... 3

3. Small, body length about 3 mm. t 3 in middle with a row of 3–5 stright pv setulae, without pd and ad, with 2(1–3) strong av. No minute setulae between outer ac setae. (Notopleuron bare. f2 with a row of 3–4 ventral spines, these are strong, as long as or longer than femur width. Abdomen densely dusted with black median vitta.)......................... nigribasis Stein

— Body length about 4–5 mm. t3 without row of minute pv setulae, with medium strong 1 pd, 1 ad and 1 av. Surface between outer ac setae covered with minute setulae.... 4

4. f3 all along covered with dense, long (2– 2.5x longer than femur width) and fine av and pv setae, in apical quarter with 3–4 strong av setae. f2 without spinulose ventral setae, a row of straight v setae present but they are not stronger than other setae on f2. (Scutum not dusted).................................. cilifemorata Emden

— f3 covered with more sparse and shorter (at most as slightly longer than femur width) ventral setae (except for 3–4 strong av setae in apical quarter). f2 with a row of 10– 12 spinulose ventral setae, they are much stronger than other setae on f2 ......... 5

5. f3 with with fine av setae half as long as femur width. Scutum seen from behind not dusted (Fig. 1); abdomen thinly dusted.

Figures

Figs. 2–5. 2 — H. spinigena, male head, lateral; 3 — H. spinigena, male mid leg (modified from Xue & Chao 1998: 905, figs 2097Fe and 2097Fp); 4 — H. nigribasis, male fore leg (as H. australis, from Emden 1965: 313, fig. 83b); 5 — H. affinis, male hind tibia (as H. affinoides, from Fan 2008: 484, fig. 153c) Рис. 2–5. 2 — H. spinigena, гоΛова самца сбоку; 3 — H. spinigena, среΑняя нога самца (с изменениями по Xue & Chao 1998: 905, figs 2097Fe и 2097Fp); 4 — H. nigribasis, переΑняя нога самца (как H. australis, по Emden 1965: 313, fig. 83b); 5 — H. affinis, заΑняя гоΛень самца (как H. affinoides, по Fan 2008: 484, fig. 153c)