'j he South .■■liistralian Naturalist. 
9 
Orange attacked by 0. postvittana. 
Beneath this slight web it remains concealed during the day 
(it is a nocturnal feeder), but on being disturbed it becomes very 
active, making jerky movements of escape. It may let itself fall, 
remaining suspended by means of a silk thread. T he fruit at- 
tacked soon becomes mouldy and soft, as in the example figured. 
When fully fed the larva spins a loose cocoon, gathering together 
pieces of debris or leaves, and within this changes to a pupa about 
10. S mm. in length, pale green in color, with the abdominal seg- 
ments somewhat yellowish. On the dorsal surface of each abdo- 
minal segment there are two transverse rows of fine spines, the 
anterior row^ on each segment extending further around the body 
than the posterior. The tips ol the spines are dull reddish-brown 
in color. 
The moth is about 20mm. in expanse (3-4ths. of an inch), and 
the forewings are pale brown with darker markings. The hind- 
wings are light-grey in color, with, sometimes, a number of indis- 
tinct darker marks giving the wings a mottled appearance. The 
head and antennae are light brown, while the 
body is cream\'-grey and the legs dark grey 
with light-brown tips to each tarsal joint. The 
species is extremely variable in color and markings. It flies in 
September, December, January and March, and can be found 
commonly in open places and in tlie vicinity of orchards. 
