The species is black with blue metallic reflections. On the forewings the veins are shaded white. There are red hairs on the thorax. The wingspan is 9–11 cm. Females are larger than males.
Subspecies
A. n. nox Java
A. n. noctis (Hewitson, 1859) north Borneo
A. n. erebus (Wallace, 1865) Peninsular Malaya
A. n. noctula (Westwood, 1872) north Borneo
A. n. nyx (de Nicéville, 1897) Bali
A. n. henricus (Fruhstorfer, 1899) north east Sumatra
A. n. banjermasinus (Fruhstorfer, 1899) south Borneo
A. n. solokanus (Fruhstorfer, 1903) south Sumatra
A. n. niepeltiana (Strand, 1914) Sumatra
A. n. petronius (Fruhstorfer, 1901) Nias
A. n. smedleyi (Jordan, 1937) Mentaway Island
A. n. tungensis Zin & Leow, 1982 Sumatra
A. n. mirifica Hanafusa, 1994 Batu Island
A. n. hirokoae Hirata & Miyagawa, 2006 Tuangku Island
A. n. miekoae Hirata & Miyagawa, 2006 Singkep
Status
A widespread but local species in forest localities. It is extinct in Singapore.[4]
^Swainson, 1822 Zool. Illustr. (1) 2 (20): pl. 102
^Akinori Nakanishi, Mohd. Fairus Jalil and Nordin Wahid. Catalogue of Swallowtail Butterflies (Lepidoptera: Papilionidae) at BORNEENSISpdfArchived 2012-08-07 at the Wayback Machine