Boisduval's Autumn Moth
(one synonym : Pterygosoma squamipunctum, R.Felder, 1874)
(Photo: courtesy of David Akers, Won Wron, Victoria)
The early instars of the Caterpillars of this species are greenish grey, with are darker line along the back separating rows of black spots, each spot with a stiff hair. The head and tail are brown, and there are a pair of shiny black plates behind the head.
Later instars become darker with a pair of faint broken wiggly pale lines along the back. The spots become white.
The caterpillar hides by day in groups under loose bark, and feeds nocturnally on :
The caterpillar grows to a length of about 3.5 cms. It spins a cocoon in a sheltered crevice. The pupa id brown with a line of black warts along each side, and fine black lines along the edge of each developing organ.
The adult moths have a wingspan of about 5 cms. Originally, the male and female moths were thought to be different species because they look so different.
The female adult moth is white with a broad black line along each forewing ending in a black bar at the base. The body has alternate black and orange bands.
The male has fawn forewings speckled with black dots, and has pale hindwings.
The species is found over much of Australia, including :
The eggs of this species are white and oval.
They are laid in long clusters on a twig and covered in hairs by the female moth.
Further reading :
Butterflies and Moths, Collins Eyewitness Handbooks, Sydney 1992, p. 249.
Ian F.B. Common,
Moths of Australia, Melbourne University Press, 1990, figs. 42.13, 42.14, pl.30.6, p. 424.
Peter B. McQuillan, Jan A. Forrest, David Keane, & Roger Grund,
Caterpillars, moths, and their plants of Southern Australia,
Butterfly Conservation South Australia Inc., Adelaide (2019), p. 140.
Moths of Victoria - Part 2,
Tiger Moths and Allies - NOCTUOIDEA (A),
Entomological Society of Victoria, 2009, pp. 5-7.
Characters of a few Australian Lepidoptera, Collected by Mr. Thomas R. Oxley,
Transactions of the Entomological Society of London,
New Series, Volume III, Number 8 (1856), p. 286.
Paul Zborowski and Ted Edwards,
A Guide to Australian Moths, CSIRO Publishing, 2007, p. 172.
(updated 16 March 2012, 24 May 2023)