Description from Charles Thomas Bingham (1907) The Fauna of British India, Including Ceylon and Burma, Butterflies.
Volume II.

Male and female.
Differs from Troides helena cerberus as follows.

Male: Hindwing: the black along the dorsal and terminal margins both on upper and undersides much broader; on the upperside entirely filling interspace 1, on the underside with only a narrow streak of yellow at the angle between the median vein and vein 2; the cone-shaped black markings on the terminal margin shorter and broader; on the costal margin the black is narrower than in cerberus, barely extended below vein 8 except at the base and apex of the wing where it broadens; the abdomen is dull yellow above and below not shaded with black.

Female: Hindwing: the black on the costal margin as in cerberus, but there is always a large yellow spot at base of interspace 7; interspace 1 black, with a pale patch in the middle; the black terminal border broader, the inwardly extended cone-shaped markings prominent, those in interspaces 2 and 3 with pale buff lateral edgings, extended inwards to the postdiscal spots.
In both male and female the hindwing on the upperside is clothed with soft, silky, long brownish-black hairs from base along the dorsal area.

Expanse: 140–190 mm.

Habitat: Southern India.
Bombay to Travancore.

Larva.
Roughly cylindrical, tapers a little to each end, with two rows of fleshy processes somewhat curved forwards and a double row on each side that are much shorter.
On the 2nd, 3rd and 4th segments an additional long pair between the dorsal and lateral rows.
Head smooth and black; body of a uniform dark madder brown, prettily lighted with a tinge of pink at the points of some of the fleshy processes; dorsal process on the 8th segment and a lateral pair on the 7th pinkish-white, with a band of the same colour uniting them.

Pupa.
Suspended by the tail and a band that encircles it much nearer the head than is usual with Papilio pupae.
In form stout, flattened, dilated in the middle, with head and thorax thrown back.
Head somewhat angular and tuberculated; two of the abdominal segments each with a prominent dorsal pair of pointed tubercles.
Colour usually light brown, with a strongly contrasting saddle of old gold. (
After Davidson & Aitken) - Mr T. A. Sealy (Proc.
Ent Soc.
1875 p. 9) states- "The pupa possesses the power of making a curious noise like pha-pha!,
and makes it very loudly when touched; the noise is accompanied (perhaps produced) by a short contraction of the abdominal segments.
I thought at first it was merely produced by the rubbing of one ring of the pupa-case against the next, but the sound did not resemble a mere frictional sound, it was more like the sound of a rush of air through small holes.
I tried to produce it with a dead chrysalis but failed: the pupa sometimes contracted on being touched without making the noise, and appeared unable to make the noise until some time was given to allow it to recover its vigour."
Messrs. Davidson and Aitken have also noticed this power in the pupa, but they speak of it "as a husky squeaking noise, produced apparently by friction of the abdominal rings."
Description from Charles Thomas Bingham (1907) The Fauna of British India, Including Ceylon and Burma, Butterflies. Volume II.
Male and female. Differs from Troides helena cerberus as follows.
Male: Hindwing: the black along the dorsal and terminal margins both on upper and undersides much broader; on the upperside entirely filling interspace 1, on the underside with only a narrow streak of yellow at the angle between the median vein and vein 2; the cone-shaped black markings on the terminal margin shorter and broader; on the costal margin the black is narrower than in cerberus, barely extended below vein 8 except at the base and apex of the wing where it broadens; the abdomen is dull yellow above and below not shaded with black.
Female: Hindwing: the black on the costal margin as in cerberus, but there is always a large yellow spot at base of interspace 7; interspace 1 black, with a pale patch in the middle; the black terminal border broader, the inwardly extended cone-shaped markings prominent, those in interspaces 2 and 3 with pale buff lateral edgings, extended inwards to the postdiscal spots. In both male and female the hindwing on the upperside is clothed with soft, silky, long brownish-black hairs from base along the dorsal area.
Expanse: 140–190 mm.
Habitat: Southern India. Bombay to Travancore.
Larva. Roughly cylindrical, tapers a little to each end, with two rows of fleshy processes somewhat curved forwards and a double row on each side that are much shorter. On the 2nd, 3rd and 4th segments an additional long pair between the dorsal and lateral rows. Head smooth and black; body of a uniform dark madder brown, prettily lighted with a tinge of pink at the points of some of the fleshy processes; dorsal process on the 8th segment and a lateral pair on the 7th pinkish-white, with a band of the same colour uniting them.
Pupa. Suspended by the tail and a band that encircles it much nearer the head than is usual with Papilio pupae. In form stout, flattened, dilated in the middle, with head and thorax thrown back. Head somewhat angular and tuberculated; two of the abdominal segments each with a prominent dorsal pair of pointed tubercles. Colour usually light brown, with a strongly contrasting saddle of old gold. (After Davidson & Aitken) - Mr T. A. Sealy (Proc. Ent Soc. 1875 p. 9) states- "The pupa possesses the power of making a curious noise like pha-pha!, and makes it very loudly when touched; the noise is accompanied (perhaps produced) by a short contraction of the abdominal segments. I thought at first it was merely produced by the rubbing of one ring of the pupa-case against the next, but the sound did not resemble a mere frictional sound, it was more like the sound of a rush of air through small holes. I tried to produce it with a dead chrysalis but failed: the pupa sometimes contracted on being touched without making the noise, and appeared unable to make the noise until some time was given to allow it to recover its vigour." Messrs. Davidson and Aitken have also noticed this power in the pupa, but they speak of it "as a husky squeaking noise, produced apparently by friction of the abdominal rings."
Troides minos