Aug 28 (Reuters) - Thundelarra Ltd THX.AX
* Announces a renounceable pro-rata rights issue to eligible shareholders to raise up to about $4.23 million
* Shareholders can subscribe for 2 new shares for every 5 existing shares they hold at issue price of $0.025 per share
* Shareholders can subscribe for 1 free attaching listed option for every 2 shares subscribed for an exercise price of $0.05 each