Rhopaea magnicornis, the brown cockchafer, is a species of beetle of the family Scarabaeidae. It is found in Australia (southern Queensland, northern New South Wales).
Description Adults reach a length of about . The body is dark brown, while the antennae and legs are reddish-brown.
Life history They are considered a pest species, damaging pastures and attacking the roots of sugarcane, arrowroot and pineapple.
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