Merci Rapha, c'est ce genre là.
La clé ci-dessous nous mène à
S. cyanea.

Christian Widmann : Brésil : Santa Cruz dos Navegantes (Pouca Farinha) (Guarujá) : 00000 : 28/10/2014
Altitude : 10 m - Taille : NR
Réf. : 132265
Entre parenthèse, il y a une très belle photo de
Synoeca dans la galerie (
https://www.galerie-insecte.org/galerie ... ?ref=83450), pour l'instant sp., mais qui correspond à
S. surinama. On pourrait donc finaliser l'ID dans ce cas aussi.
Pour l'identification:
A Phylogenetic Analysis of Synoeca de Saussure, 1852, A Neotropical Genus of Social Wasps (Hymenoptera: Vespidae: Epiponini)
Author(s): Sergio R. Andena, James M. Carpenter, and Fernando B. Noll
Source: Entomologica Americana, 115(1):81-89. 2009.
Published By: The New York Entomological Society
DOI:
http://dx.doi.org/10.1664/07-RA-002R.1
URL:
http://www.bioone.org/doi/full/10.1664/07-RA-002R.1
http://www.thefreelibrary.com/A+phyloge ... 0257814221
IDENTIFICATION KEY FOR THE SPECIES OF SYNOECA DE SAUSSURE
1. Malar space shorter than pedicel (Fig. 1);
propodeum with fine punctation throughout
(Fig. 3); wings yellowish to brownish, darker
anteriorly, body yellowish brown to bluish or
greenish
2
Malar space about as long as pedicel (Fig. 2);
propodeum with punctation sparse or evanescent
at borders (Fig. 4); wings infuscate
throughout, body bluish to blackish
3
2.
Pronotum,
scutum and
scutellum with fine,
dense punctation (Fig. 5).
chalibea de Saussure
Pronotum,
scutum and
scutellum with sparse
punctation (Fig. 6), sometimes, impunctate.
virginea (F.)
3.
Pronotum,
scutum and
scutellum impunctate;
propodeum with sparse punctation;
clypeus
black, mandibles, malar space and lower
gena
black to brown-marked.
surinama (L.)
Pronotum scutum and
scutellum with sparse
punctation;
propodeum with punctation denser;
clypeus, mandibles, malar space and lower
gena reddish-marked.
4
4. First metasomal
tergum, and
sternum lacking
erect hairs outstanding above dense
pubescence
basally;
clypeus reddish.
cyanea (F.) (
https://www.flickr.com/photos/40754330@N03/5950217858)
First metasomal
tergum and
sternum with
numerous erect hairs basally;
clypeus with a
more or less dark triangular area dorsally.
septentrionalis Richards (
http://www.umsl.edu/~huntj/Synoeca.jpg)