Scutellum shortened, has nick at posterior edge; scutellar bristles missing. Ocelli reduced, has disturbed hairs and bristles. One or both eyes often small or absent. All characters overlap wild type. Eye effect is strongest at 19oC but other effects weaker. Scutellum effect best at 28oC but eyes normal. RK2.
Stated to be lost.
Claimed by Robertson (1980) to have been reisolated from a selection line for sternopleural-bristle number.