Thread subject: Diptera.info :: Scaeva ID from Tenerife

Posted by Gerrit Oehm on 05-04-2020 19:46
#1

I can not decide between S. selenitica and S. dignota; In Van Veen the differentiation for the females is following:
S. dignota: Frons rather concave, britles at the bases of the antennae white, spots normally reaching the lateral margin of the tergites
S. selenitica: Frons more convex, bristles at the base of the antennae black and numerous, spots do not reach lateral margin of the tergites
Both occur in North Africa, the fact that the spots do not go over the margin made me think that it was S. selenitica - but in the book it says "normally", so lets keep that aside - there seem to be some hairs underneath the antenna, but probably not the bristles asked for and the frons is not too big, so it could be S. dignota.