Beetle (Chafer) Tanguru (Stethaspis suturalis)

Phylum: Arthropoda 
Subphylum: Hexapoda 
Class: Insecta 
Superorder: Coleopterida 
Order: Coleoptera 
Suborder: Polyphaga 
Infraorder: Scarabaeiformia 
Superfamily: Scarabaeoidea 
Family: Scarabaeidae 
Subfamily: Melolonthinae 
Tribe: Stethaspini 
Genus: Stethaspis
Scientific name: Stethaspis suturalis,
Common name: Tanguru Chafer, Green Beetle

Stethaspis suturalis a green, flying scarab beetle which can be identified by a yellow stripe along its back.
It is common in native forest and pine plantations. 
It has large white grubs that live underground feeding on tree roots. 
The bright-green adults emerge en masse from under the soil during summer and fly with a buzzing sound soon after dark.

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Stethaspis suturalis getting ready to fly. The eltras (hard wing casing) are raised and the transparent wings are unfolding. The green patch below the thorax is called the scutellum.
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Thanks to Wikipedia for text and information: