Wings slightly divergent, crumpled and vesiculated. Thoracic terga darker than normal. Penetrance complete, viability and fertility low.
Reported in FBrf0064159 as "bl2"; symbol changed because Dana\by56 complements Dana\ba54, is in linkage group 2 not 3; linkage with Dana\ma indicates homology with by of D.melanogaster.
Mukerjee, Nov. 1956.