All bristles and hairs of heterozygote shortened and twisted. Resembles sn¹. Viability and fertility excellent; classification easy. Homozgyote has more extreme bristle and hair effects. Expression much reduced in flies raised at 18^oC (Hardy). Ki⁺ an excellent marker for cuticular clones in Ki¹/+ heterozygotes. Viability somewhat reduced but fertility near normal. RK1 as heterozygote.