Dilophotes

Key to the Dilophotes species known from Palaearctic Region and Indochina

1. Male antennae flabellate ( Fig. 4 View FIGURES 3 ­ 13 ), phallus relatively short, robust ( Figs 22, 23 View FIGURES 14 ­ 23 ) or considerably curved ( Fig. 26 View FIGURES 24 ­ 26 ) ............................................................................................. 2

­ Male antennae very slightly serrate to filiform ( Fig. 5 View FIGURES 3 ­ 13 ), phallus otherwise shaped ...... 6

2. Pronotum and elytra yellow, male eyes 1.36 times interocular distance, phallus considerably curved ( Fig. 26 View FIGURES 24 ­ 26 )............................................................................ D. luteus sp. n.

­ Pronotum and elytra concolourous black or at least pronotal margins and some parts of elytra red and both body parts at least partly covered with reddish pubescence, interocular distance 1.3­2.0 times maximum eyes diameter .................................................... 3

3. Whole body black or dark reddish brown and covered with dark pubescence ............. 4

­ At least some part of elytra and pronotum red and upper side of body at least partly covered with reddish pubescence.................................................................................. 5

4. Body black, phallus 3.3 times longer than wide in middle ( Fig. 22 View FIGURES 14 ­ 23 ) ............................. ...................................................................................................... D. anthracinus sp. n.

­ Body dark reddish brown, phallus 5 times longer than wide in middle ............................................................................................................................... D. vandykei (Nakane)

5. Black, pronotum light brown at margins, pronotum and sometimes humeral part of elytra covered with red pubescence............................................. D. ohirai (Ohbayashi)

­ At last margins of elytra and pronotum red, upper side of body covered with reddish pubescence, phallus as in fig. 23.................................................. D. lizipingensis sp. n.

6. Maximum eye diameter 1.2 times interocular distance. Phallus distinctly widened in apical part ( Fig. 25 View FIGURES 24 ­ 26 ), pronotum and elytra orange to yellow, body small (5.0­6.0 mm) .............................................................................................................. D. kubani sp. n.

­ Interocular distance at least 1.1 times maximum eye diameter. Phallus slender, parallel­sided or very slightly widened. Pronotum black or dark red, seldom orange and then body large, 8.0­13.0 mm length, and phallus as in fig. 12 ................................... 7

7. Phallus very slender, straight, internal sac attached to phallus by two basal sticks and additionally formed by two apical sclerotized complex plates ( Figs 9, 12, 13 View FIGURES 3 ­ 13 , 14, 15 View FIGURES 14 ­ 23 , D. atricollis group)........................................................................................................ 8

­ Phallus robust, considerably shorter ( Fig. 17, 19 View FIGURES 14 ­ 23 ) or curved in the apical third ( Fig. 11 View FIGURES 3 ­ 13 , 16 View FIGURES 14 ­ 23 ), internal sac otherwise shaped ( Figs 17, 18, 20 View FIGURES 14 ­ 23 ) .................................................. 16

8. Lower plate of internal sac small ( Figs 14 View FIGURES 14 ­ 23 , 13 View FIGURES 3 ­ 13 )............................................................. 9

­ Lower plate of internal sac extensive ( Figs 9, 12 View FIGURES 3 ­ 13 , 15 View FIGURES 14 ­ 23 ) ............................................... 11

9. Upper plate of internal sac widely curved ( Fig. 14 View FIGURES 14 ­ 23 ).................................................... 10

­ Upper plate of internal sac straight basally ( Fig. 13 View FIGURES 3 ­ 13 )...................... D. holzschuhi sp. n.

10. Ventral margin of upper plate dentate (see Kasantsev, 2000, fig. 5)............................................................................................................................... D. qinlinganus Kasantsev

­ Ventral margin of upper plate simple ( Fig. 14 View FIGURES 14 ­ 23 )................................ D. laosensis sp. n.

11. External margin of lower plate of internal sac dentate .............................................. 12

­ External margin of lower plate of internal sac entire ................................................. 13

12. Body large, 8­13 mm length, orange yellow, upper part of external margin of lover plate of internals sac straight ( Fig. 12 View FIGURES 3 ­ 13 )......................................... D. bhutanensis sp. n.

­ Body smaller, 6.0 mm length, external margin of lover plate of internals sac widely rounded.................................................................................................. D. sausai sp. n.

13. Pronotum dark red with infuscate middle, elytra dark red, and sometimes slightly infuscate basally................................................................................ D. particularis Pic

­ Pronotum concolour black or red ............................................................................... 14

14. Pronotum and elytra concolour, dark red to brownish black, and always covered with red pubescence ........................................................................................................... 15

­ Pronotum black, with very short inconspicuous brown pubescence, elytra brightly orange red ............................................................................................. D. atricollis Pic

15. Inner margin of lower plate widely emarginate (see Kasantsev, 2000, fig. 7)................................................................................................................ D. berezowskii Kasantsev

­ Inner margin of lower plate with sharp dent (see Kasantsev, 2000, fig. 3) ........................................................................................................................ D. tibetanus Kasantsev

16. Each elytron with 2 costae in humeral part....................................... D. ilyai Kasantsev

­ Each elytron with 3 costae in humeral part ................................................................ 17

17. Internal sac extent beyond apex of phallus by at least a half of phallus length ........ 18

­ Internal sac extent at most very slightly beyond apex of phallus ............................... 20

18. Phallus slender, moderately curved apically, internal sac only slightly wider than phal­ lus....................................................................................... D. atrorufus (Kiesenwetter)

­ Phallus very stout, internal sac robust, distinctly wider than apical part of phallus .. 19

19. Apical ring approximately as long as wide ( Fig. 20 View FIGURES 14 ­ 23 )................... D. pacholatkoi sp. n.

­ Apical ring twice wider than long ( Fig. 18 View FIGURES 14 ­ 23 ) ................................... D. moxiensis sp. n.

20. Phallus three times longer than internal sac ( Fig. 17 View FIGURES 14 ­ 23 ) ......................... D. jendeki sp. n.

­ Phallus five times longer than internal sac ( Fig. 16 View FIGURES 14 ­ 23 ) ..................... D. bolavensis sp. n.