Key to males of Palaearctic species of Thrypticus
Thrypticus riparius Negrobov, 1971 was described based on a female, but has been tentatively included in the key based on the known female characters. Thrypticus pruinosus Parent is included in the key in the sense of Negrobov & Stackelberg (1971) but the species probably represents a different species.
1 Scutellum with 6–8 strong marginal setae; hypandrium without swelling or notch; surstylus with numerous strong setae; hypopygium Fig. 6A ................................................................... smaragdinus Gerstäcker
- Scutellum with 2 strong marginal setae, sometimes with 2 additional small lateral setae; surstylus not as above; hypandrium usually with swelling or notch........................................................................... 2
2 Scutellum with 2 small lateral setae in addition to the strong marginal setae; tibiae usually yellow..................... 3
- Scutellum without small lateral setae in addition to the strong marginal setae; tibiae usually dark (tibiae yellowish in T. politus, T. riparius and T. virescens)............................................................................ 12
3 Femora mainly yellow................................................................................. 4
- Femora mainly dark................................................................................... 7
4 At least antennal scape yellow........................................................................... 5
- Antenna entirely black................................................................................. 6
5 Antennal scape yellow, pedicel partly brown; cercus as long as surstylus, without projection; surstylus curved, pyriform, without apicodorsal notch; hypopygium Fig. 5 ........................................................ viridis Parent
- Antennal scape and pedicel yellow; cercus longer than surstylus, with slender projection; surstylus straight, parallel-sided, with apicodorsal notch; hypopygium Figs 4A, B, C .................................................. kechevi sp. nov.
6 Surstylus straight, with 6 setae and hairs at apex; hypopygium Fig. 6C .................................. atomus Frey
- Surstylus curved, with more than 40 setae and hairs; hypopygium Fig. 6D. mongoliensis Negrobov, Selivanova & Maslova
7 Antennal scape and pedicel yellow; hypopygium Fig. 6E ........................... aphroditus Negrobov & Tsurikov
- Antennal segments entirely dark......................................................................... 8
8 Surstylus entirely yellow; surstylus slender and parallel-sided; hypopygium Fig. 6F ................... incanus Negrobov
- Surstylus with black apex............................................................................... 9
9 Apical setae of epandrial lobes on almost same level; surstylus apically pointed; hypopygium Fig. 7A .... pollinosus Verrall
- Apical setae of epandrial lobes on different levels; surstylus apically rounded..................................... 10
10 Surstylus apically pointed in ventral view, with small teeth; hypopygium Fig. 7B ..................... vestitus Negrobov
- Surstylus apically rounded in ventral view, without small teeth................................................ 11
11 Femora entirely metallic green, surstylus mainly black; phallus apicoventrally with triangular projection; hypopygium Fig. 7C ................................................................................ intercedens Negrobov
- Femora metallic green and apical ¼ yellow; surstylus only black in apical part; phallus apicoventrally with finger-like projection; hypopygium Fig. 7D .............................................................. paludicola Negrobov
12. Tip of arista white; legs entirely yellow; basal antennal segments yellow (male unknown).............. riparius Negrobov
- Arista entirely black; legs partly dark; antennal segments usually black.......................................... 13
13 Fore tibia ventrally with thin apical seta, longer than diameter of tibia; fore basitarsus with 1 ventral and 1 pv apical seta, twice as long as diameter of tarsomere; legs black, knees dark brown; surstylus and cercus black; hypopygium Fig. 7E ............................................................................................... emiliae Negrobov
- Fore tibia and tarsomeres lacking setae as above; knees usually yellow (except T. cuneatus and T. nigricauda)........... 14
14 Mid tibia without ad seta at basal third................................................................... 15
- Mid tibia with ad seta at basal third...................................................................... 17
15 Wing shape cuneiform, R 4 +5 and M diverging, basal section of CuA longer than distal section (Fig. 9F); hypopygium Fig. 7F ....................................................................................... cuneatus Becker
- Wing shape ovate, R 4+5 and M parallel; basal section of CuA shorter than distal section............................. 16
16 Thorax and abdomen shiny metallic green; surstylus and cercus black; surstylus at middle three times as broad as basally; hypopygium Fig. 8A ........................................................................ nigricauda Wood
- Thorax and abdomen shiny metallic blue violet; surstylus and cercus yellow; surstylus at middle as broad as basally; hypopygium Figs 2A, B, C ...................................................................... caeruleus sp. nov.
17 Arista pubescent, almost uniformly thiсkened throughout its length; clypeus about as high as broad; surstylus slender, apically broadened, with several apical protrusions; hypopygium Fig. 8B ...................................... divisus Strobl
- Arista almost bare, thin; clypeus considerably higher than broad............................................... 18
18 Veins R 4+5 and M distally diverging; surstylus apically with pointed protrusion; hypopygium Fig. 8C ......... laetus Verrall
- Veins R 4+5 and M distally parallel........................................................................ 19
19 Surstylus and cercus mainly dark; ventral margin of surstylus almost straight..................................... 20
- Surstylus and cercus mainly yellow; ventral margin of surstylus distinctly bowed.................................. 21
20 Surstylus apicolaterally curved in almost right angle in ventral view; hyopygium Fig. 8D .............. altaicus Negrobov
- Surstylus apicolaterally rounded in ventral view; hypopygium Fig. 8E ............................ virescens Negrobov
21 Surstylus more than twice as long as wide in ventral view.................................................... 22
- Surstylus at most twice as long as wide in ventral view...................................................... 24
22 Surstylus apically with strong U-shaped excavation; cercus with slender apical projection; hypopygium Fig. 8F ................................................................................................. politus Negrobov
- Surstylus apically without strong U-shaped excavation....................................................... 23 23 Surstylus with lateral margin parallel in ventral view; inner and outer setae of epandrial lobes crossing each other in ventral view; hypopygium Fig. 9A ................................................................ subtilis Negrobov
- Surstylus with lateral margin curved in ventral view; inner and outer setae of epandrial lobes divergent in ventral view hypopygium Fig. 9B .............................................................................. tarsalis Parent
24 Cercus with apical prolongation 4 times as long as high; hypopygium Fig. 9C ........................................................................................... pruinosus Parent sensu Negrobov & Stackelberg (1971)
- Cercus with apical prolongation at most 2.5 times as long as high.............................................. 25
25 Surstylus strongly broadened in apical third; surstylus outside margin strongly rounded in ventral view; hypopygium Fig. 9D .......................................................................................... bellus Loew
- Surstylus parallel-sided in apical third; surstylus outside margin parallel–sided in ventral view; hypopygium Fig. 9E .............................................................................................. tsacasi Negrobov