Key to species of Tumidiclava (both sexes) from Holarctic region

(Includes the male of T. tenuipenis Lin which is known only from Fujian, China)

1 Female (antennal club with a terminal process at apex)........................................................ 2

- Male (antennal club without a terminal process at apex).......................................................8

2 Antenna with club 2-segmented (Fig. 2).................................................... T. buerjinica sp. nov.

- Antenna with club 3-segmented (Figs 7, 11, 15, 24, 28)........................................................3

3 Fore wing disc sparsely setae (Fig. 12)..................................................... T. tamariska sp. nov.

- Fore wing disc more densely setae (Figs 9, 16, 25, 29)........................................................4

4 Fore wing hyaline, at most with a slight infuscation behind venation.............................................5

- Fore wing with a strong infuscation behind venation..........................................................6

5 Mesoscutum with two dark spots relatively short, not with distal pair of setae.................... T. pulchrinotum Girault

- Mesoscutum with two dark spots relatively long, with distal pair of setae....................... .. T. bimaculata (Blood)

6 Venation extending to at least 0.44 length of fore wing (Figs 9, 25)............................................... 7

- Venation extending to at most 0.38 length of fore wing (Fig. 16).................................... T. tenuipenis Lin

7 Longest fringe setae on fore wing relatively short, 0.11× maximum wing width (Fig. 9)............ T. subcaudata Nowicki

- Longest fringe setae on fore wing relatively long, 0.25× maximum wing width (Fig. 25)............. T. minuscula Nowicki

8 Antenna with club 2-segmented (Fig. 4); apterous............................................ T. buerjinica sp. nov.

- Antenna with club 3- or 5-segmented (Figs 13, 22, 27); macropterous............................................ 9

9 Antenna with club 3-segmented (Fig. 27)..................................................................10

- Antenna with club 5-segmented (Figs 13, 22).............................................................. 12

10 Mesoscutum with 2 distinct dark spots................................................... T. pulchrinotum Girault

- Mesoscutum more or less uniformly colored, without distinct dark spots.........................................11

11 Longest fringe setae on fore wing relatively short, 0.23× maximum wing width (Fig. 16)................. T. tenuipenis Lin

- Longest fringe setae on fore wing relatively long, more than 0.26× maximum wing width (Fig.25).... T. minuscula Nowicki

12 VII-VIII gastral tergites with 2 blade-like projections....................................... T. subcaudata Nowicki

- VII-VIII gastral tergites without such projections...........................................................13

13 Mesoscutum with 2 distinct dark spots.................................................... T. bimaculata (Blood)

- Mesoscutum uniformly colored.......................................................... T. tamariska sp. nov.