Synergini

Schwéger, Szabina, Melika, George, Tang, Chang-Ti, Bihari, Péter, Bozsó, Miklós, Stone, Graham N., Nicholls, James A. & Pénzes, Zsolt, 2015, New species of cynipid inquilines of the genus Synergus (Hymenoptera: Cynipidae: Synergini) from the Eastern Palaearctic, Zootaxa 3999 (4), pp. 451-497 : 454

Key to Synergini genera

1 Metasomal tergite 1 reduced to a dorsal crescent-shaped projecting scale, smooth and shining; clypeus well differentiated from lower face, anterior tentorial pits deep, antennal torulus well below mid height of eye........................ Rhoophilus

- Metasomal tergite 1 in a form of ring or collar, sulcate, at least laterally; clypeus indistinctly separated from lower face, anterior tentorial pits indistinct, antennal torulus on mid height of eye............................................... 2

2 Head trapezoid in frontal view, broadest part on dorsal edge of eyes and gradually narrowing toward lower edge of gena, 2.5– 2.8 times as broad as long in dorsal view; interocellar triangle narrow, posterior edge of frontal ocellus lies on a line between anterior edges of lateral ocelli; anterior part of pronotum rectangular in dorsal view, right angle between anterior and lateral sides present; pronotum descending vertically to propleura; lateral part of pronotum going down from dorsal part also nearly at a right angle; strong pronotal carina divides lateral part from frontal, both of which also oriented almost at a right angle to each other; dorsomedian part of pronotum invisible in dorsal view................................................ Ufo

- Head rounded, ovate in frontal view, broadest part always on a median level of eye, 1.6–2.1 times as broad as long from dorsal view; interocellar triangle always broader, posterior edge of frontal ocellus lies away from a line between anterior edges of lateral ocelli; lateral pronotal carina absent or present; pronotum rounded in dorsal view, right angle between anterior and lateral sides absent; dorsomedian part of pronotum always visible in dorsal view........................................ 3