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Spitfire sawfly
The spitfire sawfly (''Perga affinis'', family Pergidae) is a hymenopteran insect found in Australia. It is up to 22 mm long. It has two pairs of wings, with a wingspan up to 40 mm. Its wings are honey colored. Its larvae are up to 80 mm long, and somewhat resemble a caterpillar.
The sawfly derives its name from the saw-like ovipositor of the female, which is used to open holes in the plant within which she lays her eggs. While closely related to wasps, sawflies lack both the narrow waist and sting of the wasp.
Although the adults of this sawfly species are not often seen the larvae are quite conspicuous as they grow larger, resembling hairy caterpillars. Steelblue sawfly larvae are usually seen during the day in groups on the branches and stems of ''Eucalyptus'' trees. At night they disperse to feed on the leaves of the host plant. When threatened the larvae will raise their head and eject a yellow-green liquid.〔 It is this action that gives them their common name of 'spitfires'. This strong smelling liquid consists predominantly of eucalyptus oil and is used as a deterrent against predators.
==Description==
The larvae vary from dark blue or black to yellow and brown depending on the species and up to 80 mm long. The body is sparsely covered with white bristly hairs and the tail, which is raised when disturbed, is yellow and can exude an odorous fluid. During the day the larvae congregate in clusters of 20 or 30 for protection and disperse at night to feed. The adult wasps are mainly black or brown, with yellowish markings and about 25 mm long.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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