Spontaneous;normal standard is tetra-molter: M3(3眠, Trimolting) larvae mature after three molts, most common type in primitive races and in B. mandarina, physiologically the fourth instar of normal tetramolters might be omittedjudging from changing patterns of hemolymph protein components in larval stage throughout: M5(5眠, pentamolting) recessive and possibly repeats fourth instar of the normal.See also rt.