Found as caterpillars newly hatched from eggs laid on new leaves of Litsea glutinosa (Pond Spice).  The eggs were greenish and large, being over 1mm or about  0.05" in diameter.  The mature larvae seem to prefer the newer, tender leaves, but will eat older, mature leaves.  Both young and mature caterpillars will rest on the upper side of a leaf.  Although they rarely extend them, these caterpillars do have scent/stink horns like many of the Papilio butterfly larvae.

The caterpillars were found in North Point, Hong Kong the first week of July, 1998.  The weather was hot and humid with occassional light rain.  Some others were found at the end of October, 1998, in Sai Kung, Hong Kong at about 500 feet elevation.
 

Closeup of newly hatched larva with  a couple of unhatched ova. The ova were 1.3 mm / 0.05 inch diameter. The young larva, a couple days old (about 5mm / 0.25 inch)

The young larva, about a week old. (about 25mm / 1 inch)

The mature caterpillar (side view). (about 55mm / 2.25 inches)

The mature caterpillar (top view).

Preparing to become pupas The arrow points to the silk waist thread

About 24 hours later. On their food plant, these pupas  would resemble broken twig stubs. (about 40mm / 1.5 inches long)

14 days later a mature female emerged