Gene controlling skin color of new hatched larva.Spontaneous;newly hatched larvae from eggs laid by homozygous mother pale-reddish brown irrespective of their own genotype, feeding third instar, less conspicuous in grown larvae; homozygotes die as embryos: GlR (Glossy retarded) larvae reddish brown and lustrous at every molting stage, body spindle shaped; homo-lethal.