Hello Stéphane:
Here I included a key for some Gymnetis, I hope that with this you can identify some of the specomens that you have, many Gymnetis is difficult to identify watching single the part to them of above in a photography.
My regards
Carlos
key for some species of Gymnetis
adapted of Schürhoff (1937)
NOTE:
probably I needed to include some other species. Also some species surely are synonymous or subspecies of others, but of all ways I believe that the key can be useful.
They do not appear all the well-known species. In this group I include the species that Schürhoff (1937) included in Paragymnetis. And I hope that the key is understood that I have. by my English bad one !!.
A. Heavy prosternal process. in the ends it is as if it had a
blow that directs it down and the end is more
convex.........
Other species (not including in this key)B. Heavy prosternal process. The front part of this one process is
diagonally directed and the end more is flattened
superiorly..........................
Species including in this key1.Superior side with together black points more or less diluted in
yellowish and underground drawn. Pronotum in the lateral edge
with torn emergent line........
G. punctipennis Burmeister1'. Another coloration..........................2
2. Elitros with veined design.................3
2'. Elitros lacks veined design................5
3. Elitros in the later part with an acute tubercle and in the edges
with 2-3 isolated clear spots one of the
other...............
G. hebraica Drapez.3' Later part of the elitros with cleared tubercles and
extinguished. They lack isolated clear spots one of another
one.......................................................4
4. With red hairiness (it is possible to be observed in the
tibiaes)...........................
G. lanius Linn.4'. With black hairiness (it is possible to be observed in the
tibiaes)..........................
G. chalcipes G & P.5. Shining head superficially with black spot acutely defined...6
5'. By above the head it lacks black spot acutely definite....7
6. Black coloration with yellow line or gray design, Inferiorly
with some of these patterns of coloration :
a- Inferiorly withviolet copper.......
G. strigosa Ol. b- Inferiorly with gray coloration...
G. fulgurata G.& P. c- inferiorly with ocher-yellowish coloration...
G. mediana Krat.
6'. Coloration orange, or at least the edge of the élitros orange
or red; élitros with black design.......
G. hieroglyphica Vigors7. Reddish yellow hairiness (can be observed in the
tibiaes)............................................
G. subpunctata Westw.7'. Black hairiness. Prosternal process with a curved line
defined....................................
G. flavomarginata Bl.