Sympycnus Loew, 2017

Negrobov, Oleg P., Grichanov, Igor Ya. & Selivanova, Olga V., 2017, Review of East Palaearctic species of Sympycnus Loew, 1857, with a key to species, Zootaxa 4277 (4), pp. 531-548 : 546-547

Key to the East Palaearctic species of Sympycnus Loew (males)

1 Hind tarsus without long spine, long bristles or erect setae ( Fig. 23 ), rarely with elongate hairs dorsally................. 2

- Hind tarsus with long bristles ( Figs 16 , 42 ) or erect setae ( Figs 3 , 10 ) on some tarsomeres............................ 6

2 At least fore femur entirely and hind femur partly black....................................................... 3

- Fore and hind femora yellow, sometimes brown or black at apex or at base........................................ 4

3 Fore tarsus without claws; hind tarsomere 3 without erect setae...................................................................................................... S. taimyricus Negrobov, Barkalov, Selivanova & Grichanov

- Fore tarsus with 1 claw ( Fig. 33 ); hind tarsomere 3 ( Fig. 34 ) with short erect setae, sometimes hardly visible............................................................................... S. stackelbergi sp. nov. [see also couplet 13]

4 Fore and mid tarsomeres 3–5 with long hairs dorsally, longer on tarsomere 5; mid basitarsus with dorsal row of long bristles......................................................................... S. longipilosus Tang, Wang & Yang

- Fore and mid tarsi without remarkably long hairs and bristles ( Figs 2 , 14 , 27 , 33 )................................... 5

5 Hind basitarsus shorter than tarsomere 4 ( Fig. 23 ); fore basitarsus with elongate setae at base and at apex ( Fig. 22 )............................................................................................. S. simplicipes Becker

- Hind basitarsus longer than tarsomere 4; fore basitarsus with short setulae ( Fig. 27 )............... S. simplicitarsis Becker

6 Hind tarsomere 3 with two long thin bristles at base, without long spine at apex ( Fig. 42 )............................. 7

- Hind tarsomere 3 without two long thin bristles at base, with or without long bristle at apex........................... 8

7 Hind femur pale yellow, with apical 1/3 to 2/3 brown to dark brown; mid tibia usually with posteroventral bristle; hind tarsom- ere 3 distinctly shorter than tarsomere 2; apicoventral lobe of hypandrium subtriangular and pointed at apex (see Pollet et al. 2015, fig. 8).......................................................................... S. pulicarius (Fallén)

- Hind femur entirely pale yellow; mid tibia without posteroventral bristle; hind tarsomere 3 nearly as long as tarsomere 2 ( Fig. 42 ); apicoventral lobe of hypandrium semi-rounded ( Fig. 43 )................................... S. yakutensis sp. nov.

8 Hind tarsomere 3 with long spine or thick bristle at apex ( Fig. 16 )............................................... 9

- Hind tarsomere 3 without long spine or thick bristle......................................................... 13

9 Mid femur with almost full posteroventral row of strong bristles, about as long as femur diameter; fore tibia without anterodor- sal row of setae ( Fig. 14 ); fore tarsus without claws ( Fig. 15 )....................................... S. leleji sp. nov.

- Mid femur with at most 2–3 posteroventral setae at apex; fore tibia with or without anterodorsal row of setae; fore tarsus with or without claws..................................................................................... 10

10 Fore tibia slightly, but distinctly thickened, without anterodorsal row of setae, with rows of long hairs, about as long as tibia diameter.............................................. S. gorodkovi Negrobov, Barkalov, Selivanova & Grichanov

- Fore tibia simple, usually with anterodorsal row of setae ( Figs 21 , 33 ), with short hairs............................. 11

11 Hind tarsomere 3 subequal in length to tarsomere 4, with only 1 apical spine...................................................................................................... S. olejnicheki Negrobov, Barkalov & Selivanova

- Hind tarsomere 3 with 1 short bristle at middle in addition to long apical bristle; tarsomere 4 1.5–1.8 times longer than tarsom- ere 3............................................................................................... 12

12 Apical bristle on hind tarsomere 3 about as long as tarsomere 3; fore and hind femora partly black.... S. seticosta Negrobov

- Apical bristle on hind tarsomere 3 about 2 times as long as tarsomere 3; all femora yellow............. S. vadimi Negrobov

13 Only hind tarsomere 3 with erect setae ( Fig. 34 ); other segments without modified setae........... S. stackelbergi sp. nov.

- At least hind tarsomeres 3 and 4 with long bristles or erect setae............................................... 14

14 Hind tarsomere 3 enlarged, 1.5 times wider than tarsomere 4 of same tarsus.................... S. changaicus Negrobov

- Hind tarsomere 3 indistinctly wider than tarsomere 4......................................... S. ferganicus sp. nov.

Figures

FIGURES 20 – 25. Sympycnus simplicipes Becker, male (Tajikistan). 20, antenna, lateral view; 21, fore leg, lateral view; 22, fore basitarsus, lateral view; 23, hind tarsus, lateral view; 24, hypopygium, left lateral view; 25, hypopygium, ventral view.

FIGURES 13 – 19. Sympycnus leleji sp. nov., male holotype. 13, antenna, lateral view; 14, fore leg, lateral view; 15, fore tarsus, dorsal view; 16, hind tarsus, lateroventral view; 17, hypopygium, left lateral view; 18, hypopygium, ventral view; 19, apicoventral epandrial lobe and basoventral appendage of postgonite, dorsal view.

FIGURES 39 – 44. Sympycnus yakutensis sp. nov., male holotype. 39, head, anterior view; 40, antenna, lateral view; 41, wing; 42, hind tarsus, dorsolateral view; 43, hypopygium, left lateral view; 44, hypopygium, ventral view.

FIGURES 1 – 6. Sympycnus changaicus Negrobov, male (Mongolia). 1, head, dorsolateral view; 2, fore tarsus, lateral view; 3, hind tarsus, lateral view, with inset showing erect setae on tarsomeres 3 and 4; 4, wing; 5, hypopygium, left lateral view (holotype); 6, hypopygium, ventral view (holotype).

FIGURES 7 – 12. Sympycnus ferganicus sp. nov., male holotype. 7, habitus; 8, head, dorsolateral view; 9, wing; 10, hind tarsus, dorsolateral view; 11, hypopygium, left lateral view; 12, hypopygium, ventral view. Abbreviations: apv lobe = apicoventral epandrial lobe, cer = cercus, ep = epandrium, hyp = hypandrium, ph = phallus, pgt = postgonite, sur = surstylus.

FIGURES 32 – 38. Sympycnus stackelbergi sp. nov., male holotype. 32, antenna, lateral view; 33, fore leg, lateral view; 34, hind tarsus, lateroventral view; 35, hypopygium, left lateral view; 36, hypopygium, ventral view; 37, cerci, dorsal view; 38, apicoventral epandrial lobe, dorsal view.

FIGURES 26 – 31. Sympycnus simplicitarsis Becker, male syntype. 26, antenna, lateral view; 27, fore tarsus, lateral view; 28, hypopygium, left lateral view; 29, hypopygium, ventral view; 30, basoventral appendage of postgonite, lateral view; 31, apex of phallus, lateral view.