female sterile | recessive
visible | recessive
ocellar bristle
ocellus
sternopleural bristle
wing
wing vein L3
wing vein L4
Partial fusion of wing veins L3 and L4; wings often held out from body; sternopleural bristles usually doubled; ocellar bristles absent; ocelli usually absent.
A.H. Sturtevant, December 1927.