Posted by
Zeegers on 12-07-2020 16:10
#3
Dark triangles nearly always = Gymnosoma nitens. As you might observe, it is a male (narrow vertex without black), yet the thora lacks dusting. All other males have this dusting anterior to the suture.
G. Nitens is somewhat intermediate between Gymnosoma and Cistogaster,
Male Cistogaster, however, have a different abdominal pattern, for instance
https://nl.m.wikipedia.org/wiki/Cistogaster
Theo
Posted by
Sundew on 13-07-2020 00:02
#4
Interesting - I never saw a
Gymnosoma holding the wings in that way (plane turned nearly upright), which is typical for
Cistogaster... Maik's female here (
https://www.dipte...d_id=95014) has a different posture. But I admit that the triangles are very regular, and the
C. globosa male should have golden pruinosity on the fore half of the thorax. So this
Gymnosoma nitens is intermediate indeed! (What would we do without Theo...)