Gymnetis, MACLEAY, 1819

Ratcliffe, Brett C. & Nogueira, Guillermo, 2020, Description of a New Species of Gymnetis MacLeay (Coleoptera: Scarabaeidae: Cetoniinae: Gymnetini) from Colima, Mexico, The Coleopterists Bulletin 74 (1), pp. 109-115 : 114-115

KEY TO THE MEXICAN SPECIES OF ADULT GYMNETIS MACLEAY

1. Pronotum monochromatic black ............ 2

1´. Pronotum with contrasting colors, spots, flecks, or bands ................................. 4

2. Lateral marginal bead of elytra yellow..... ............................... G. ramulosa Bates

2´. Lateral marginal bead of elytra black .......... 3

3. Body length equals 16.0– 19.7 mm.......... ... G. pedroreyesi Ratcliffe and Nogueira , new species (in part, female)

3´. Size larger, body length equals 18.8–21.0 mm ... ......................................... G. poecila Schaum

4. Abdominal sternites, at least in part, with metallic bronze, metallic green, metallic reddish purple, or metallic reddish brown reflection .......................................... 5

4´. Abdominal sternites lacking metallic reflection, shiny areas, if present, black, brown, or reddish brown, especially in females ..................... 6

5. Elytra with bold pattern of alternating black and yellow bands radiating laterally from diffuse orange area at middle .................. ........................... G. stellata (Latreille)

5´. Elytra orange and/or yellow intermixed with mottled, irregularly diffuse, brown or black flecks and with 2 irregular fields of bright yellow, 1 on disc at middle and other near apex ............................... .. .. .. ... .. ... G. cupriventris kerremansi Neervoort van de Poll

6. Pronotum and/or disc of elytra predominantly light to dark orange or reddish orange mixed with black bands, spots, or flecks; elytral margin next to marginal bead without contrasting, isolated, reddish orange spots ............................................... 7

6´. Pronotum and/or disc of elytra predominantly light or dark brown, light or dark gray, black, yellow, various shades of olive, ochre, or chalky white mixed with black bands, spots, or flecks; elytral margin next to marginal bead with or without small, orange or reddish orange spots ....................... 9

7. Lateral marginal bead of elytra orange..... ............... G. bajula wollastonii Schaum

7´. Lateral marginal bead of elytra dark gray, dark brown, or black .......................... 8

8. Elytral black markings soft-edged with cloudings of light gray surrounding and/or among most soft-edged black marks ........ ............................. G. vandepolli Bates

8´. Elytral black markings hard-edged, lacking cloudings of light gray among markings. Orange phase of ................................... .......... G. radiicollis Burmeister (in part)

9. Pronotum and/or elytra predominantly light or dark brown or gray with black markings on disc and/or adjacent to lateral margin .. ... ... .. ... ... ... ... ... .. ... ... ... ... 10

9´. Pronotum and/or elytra black with yellow, ochre, or light to dark orange markings on disc and/or adjacent to lateral margin ............ 11

10. Mesometasternal process, in lateral view, projecting strongly or almost vertically downwards from ventral axis of body. Elytral apices rounded, not produced into short, spine-like projection ............................. ........................ G. coturnix Burmeister

10´. Mesometasternal process, in lateral view, projecting obliquely forward and downwards from ventral axis of body at 33–45°. Elytral apices strongly produced into short, spine-like projection ................... .. ... .. .. ... .. ... ... G. difficilis Burmeister

11. Mesometasternal process, in lateral view, projecting strongly to almost vertically downwards from ventral axis of body ...................... 12

11´. Mesometasternal process, in lateral view, projecting obliquely forward and downwards from ventral axis of body at 33–45° ................. 13

12. Lateral marginal bead of elytra yellow..... ................................. G. sallei Schaum

12´. Lateral marginal bead of elytra black. Yellow phase of ................................. ......... G. radiicollis Burmeister (in part)

13. Mesepimeron completely yellow or with trace of black on posterior margin ........... ................................ G. thula Ratcliffe

13´. Mesepimeron completely black ............... ... G. pedroreyesi Ratcliffe and Nogueira , new species (in part, male)