grimScer\UAS.cCa when driven by Scer\GAL4GMR.PF or Scer\GAL4Bx-MS1096 is lethal. The rare grimScer\UAS.cCa, Scer\GAL4GMR.PF escapers have severely reduced eyes. The rare grimScer\UAS.cCa, Scer\GAL4Bx-MS1096 escapers display wing agenesis, notum reduction and elimination of macrochaetae and microchaetae.