Abstract
1. One young larva and one squeezed egg of Papilio hipponous were obtained in Bohol, Philippines and reared on Citrus. 2. Young larvae of P. hipponous resembled those of P. polytes or P. alphenor ledebouria. Ground color of 5th instar larvae of P. hipponous was light reddish brown when moulted, although one larva became green with yellow mottling one day after moulting and the other brownish green. 3. Pupae were green and resembled those of P. bianor. 4. One pupa died next day after pupation and the other pupa diapaused for about 2 months at the conditions of 25℃ and 15-hour light a day. This individual was kept at room temperature in the Philippines for two weeks after pupation. 5. Interspecific hybrids between P. hipponous female and P. alphenor ledebouria male were obtained at the rearing room under 25℃ and 15-hour light a day in Nanzan University. The hybrids emerged were tailed males only and they were all sterile. Their immature stages were intermediate between the parental species in general.
