Bolitogyrus Chevrolat

Key to the species of Bolitogyrus Chevrolat of China

(based on Hu et al., 2011, excluding B. fukienensis Scheerpeltz, known only from females)

1. Forebody usually with metallic hue; elytra unicolored, without maculae on surface; pronotum densely and coarsely punctate near anterior angles, with two setiferous punctures in each dorsal row, one situated close to anterior margin, another right behind middle....................................................................................... 2

- Forebody usually without distinct metallic hue; elytra bicolored, usually with yellow to reddish brown maculae on surface; pronotum sparsely and extremely shallowly punctate near anterior angles, with only one setiferous puncture in each dorsal row, situated close to anterior margin........................................................................ 9

2. Forebody entirely black, more or less with metallic hue...................................................... 3

- Forebody not entirely black, variably colored with elytra metallic blue or metallic greenish-blue..................... 8

3. Underside of paramere with a narrowly raised longitudinal ridge along midline, from near apical 1/3 to a little below apex (Figs. 5 D, 5-1E)..................................................................... B. metallicus sp. nov.

- Underside of paramere flat, without any ridge along midline.................................................. 4

4. Aedeagus with apex of paramere not reaching that of median lobe (Fig. 11-1 D)................. B. nigropolitus Smetana

- Aedeagus with apex of paramere distinctly protruding beyond or at least at the same level of that of median lobe........ 5

5. Aedeagus with lateral sides of paramere straightly and sharply expanded at about apical 1/ 4 in parameral view, forming a nearly equilateral triangular apical portion (Figs. 7 D, 7-1G)....................................... B. uncus sp. nov.

- Aedeagus with lateral sides of paramere only gently and arcuately expanded at about apical 1/ 4 in parameral view, not forming equilateral triangular apical portion (Figs. 11 D, 11-1F)....................................................... 6

6. Paramere with 3-5 subapical setae of various length on each side........................... B. nigerrimus Yuan et al.

- Paramere with 2 long subapical setae on each side.......................................................... 7

7. Aedeagus with sensory peg setae of paramere covering most of apical portion except for narrow medial area............................................................................................ B. electus Smetana & Zheng

- Aedeagus with sensory peg setae of paramere distributed near sides of apical portion............. B. huanghaoi Hu et al.

8. Paramere of aedeagus in parameral view relatively wider, with lateral sides nearly parallel, covering most of median lobe (Fig. 8-1 F), underside with medial groups of sensory peg setae reaching downward to the same level of lateral groups (Figs. 8 D, 8- 1G).............................................................................. B. cyanipennis (Zheng)

- Paramere of aedeagus in parameral view relatively narrower, with apical portion widened laterally, only covering apical por- tion of median lobe (Fig. 10-1 F), underside with medial groups of sensory peg setae reaching downward beyond lateral groups (Figs. 10 D, 10-1G)............................................................ B. kitawakii Smetana & Zheng

9. Pronotum reddish brown with black spot of variable size in middle; tergites III-V reddish brown, with wide black median stripe on each; median lobe of aedeagus with two tooth-shaped processes near midline at about apical 1/4 on its inner face..................................................................................................... 10

- Pronotum and tergites III-V unicolored, entirely reddish brown, dark brown or black; median lobe of aedeagus without pro- cesses at about apical 1/4, if so, the processes situated on lateral sides, not near midline............................ 11

10. Apical portion of paramere with sensory peg setae more or less evenly scattered (Figs. 9 D, 9-1F); median lobe with apical por- tion not constricted apically (Figs. 9 E, 9-1G)........................................... B. elegantulus Yuan et al.

- Apical portion of paramere with sensory peg setae arranged along sides (Figs. 4 D, 4-1G); median lobe with apical portion abruptly constricted into small and narrow apex (Figs. 4 E, 4-1H)......................... B. magnimaculosus sp. nov.

11. Paramere with apical portion divided into two separate lobes (Figs. 2 D, 2-1F)................... B. hainanensis sp. nov.

- Paramere with apical portion unilobed................................................................... 12

12. Paramere with apical portion narrowly and abruptly constricted to apex (Figs. 3 E, 3-1F).............. B. loculus sp. nov.

- Paramere with apical portion not constricted, if so, then only gradually narrowed to apex.......................... 13

13. Pronotum and tergites III-V reddish brown........................................... B. pictus Smetana & Zheng

- Pronotum and tergites III-V dark brown to black.......................................................... 14

14. Paramere of aedeagus with apex not reaching that of median lobe............................................. 15

- Paramere of aedeagus with apex protruding beyond that of median lobe........................................ 16

15. Medial groups of sensory peg setae on underside of paramere distinctly disjunct with those along apex and lateral sides (Figs. 6 D, 6-1G).......................................................................... B. profundus sp. nov.

- Medial groups of sensory peg setae on underside of paramere connected with those along apex and lateral sides (Figs. 1 D, 1- 1G)............................................................................... B. depressus sp. nov.

16. Paramere of aedeagus with apical third not conspicuously narrowed, covering almost entire apical third of median lobe......................................................................................... B. flavus Yuan et al.

- Paramere of aedeagus with apical third conspicuously narrowed, leaving large lateral portions of apical third of median lobe uncovered......................................................................................... 17

17. Elytron with transverse macula constricted in about basal third; paramere of aedeagus with middle portion relatively narrow not covering entire middle portion of median lobe...................................... B. rufomaculatus (Shibata)

- Elytron with transverse macula extended to about basal two thirds; paramere of aedeagus with middle portion more dilated, entirely covering middle portion of median lobe......................................... B. taiwanensis (Hayashi)