Posted by Nosferatumyia on 27-11-2015 16:55
#5
U. stylata always has the 2 apical crossbands fused,
U. affinis has the stigmal crossband more or less complete and the preapical crossband lesser washed at anterior margin and the apical crossband wider separated from it; in addition, this fly has longer oviscape (in affinis it is not visible beu\yond the wings.
And the final reason: it observes a flower bud of
Carduus or
Cirsium, but not
Centaurea (
Acrolophus), the host of affinis.