Nick Upton / Box bug (Gonocerus acuteangulatus) on Ivy leaves in a garden, Wiltshire, UK, September. This nationally endangered bug is spreading northwest from its former toehold in southeast UK, originally on Box...

Nick Upton / Box bug (Gonocerus acuteangulatus) on Ivy leaves in a garden, Wiltshire, UK, September. This nationally endangered bug is spreading northwest from its former toehold in southeast UK, originally on Box...

Rod Williams / Box bug (Gonocerus acuteangulatus) nymph on leaf, Brockley cemetery, Lewisham, London, UK, September.

Kim Taylor / Close up of head of Shieldbug (Gonocerus acuteangulatus) Surrey, UK

Michael Hutchinson / Box bug (Gonocerus acuteangulatus) on leylandii, Bristol, UK, March.

Nick Upton / Box bug (Gonocerus acuteangulatus) on a Greater Periwinkle (Vinca major) leaf in a garden, Wiltshire, UK, April. This nationally endangered bug is spreading northwest from its former toehold in southe...