RK2. Body colour is dark, especially along the sides of the thorax. The phenotype is similar to e^s but not quite so dark. Females are sterile and males are fertile when raised at 27^oC. Both sexes are fertile when raised at 17^oC.

Body colour: dark, especially along sides of thorax; similar to e^s but somewhat lighter. At 27^oC, female sterile and male fertile; at 17^oC, both sexes fertile. RK2.