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These larvae of the sawfly are called spitfire grubs. They feed on eucalyptus overnight and huddle in a group on a strong stem during the day. These differ from Perga dorsalis by being grey and having red heads.
Already large and its still winter.
A smaller group nearby are possibly the same species.
This link names a fully read headed sawfly as P. dorsalis???http://lifeunseen.com/index2_item_3407.p...
At least one of them has half a black head?
Lat: -37.73, Long: 145.38
Spotted on Aug 12, 2012 Submitted on Aug 14, 2012