I find I get a lot of these bugs visiting my garden. Typically, like all shield bugs, this bug is shield-shaped, which is generally green in colour with a triangle of reddish-brown on its back with a green centre. The wings are red-tipped, and the antennae are long with few segments. It can grow up to 15mm long.
It releases a pungent odour when attacked or alarmed. It feed on fruits and leaves of various trees and shrubs, especially Hawthorn.
Seen all year round, although usually dormant during the winter months. It favours hedgerows and woods, but maybe seen in gardens. A common and widespread species, but mainly in the south.
Photographs of Hawthorn Shieldbug (Acanthosoma haemorrhoidale), taken August 2016, rear garden , Staffordshire. © Pete Hillman 2016. Camera used Nikon D3200, with Sigma 105mm macro lens with softbox flash diffuser.