Ocelli of heterozygous females are usually moved closer together or fused and that additional head bristles are often missing. Wings have a gap in the fifth longitudinal wing vein and, less frequently, in the posterior cross vein. Hemizygotes (Df(1)HC244) are completely wild type.

RK1 Heterozygotes lack one or both ocellar bristles, and the postvertical bristles are also often absent. Other macrochaetae, especially the scutellar bristles, are occasionally missing. Wings are frequently positioned abnormally, and have incised margins; this effect is more marked in homozygous females.

One or both ocellar bristles, frequently postverticals, missing; other bristles, especially the scutellars, sometimes absent. Oce/Oce females lack 90% of postvertical and ocellar macrochaetae and 10-40% of anterior dorsocentrals; Oce/+ females lack 60-80% of ocellars and 90-95% of postverticals but show minimal loss of dorsocentral bristles; in ac^Hw-49c/Oce females Oce appears to be epistatic to ac^Hw-49c in the thoracic region (10% missing dorsocentrals) and additive in the head with 95% missing postverticals and 100% missing ocellars (Stoddard, 1972). Wings frequently positioned abnormally, have incised margins; effect more marked in homozygous females. Bristle effect dominant. Good viability and fertility in both sexes. RK1.