Monteithiella humeralis adults are 9mm long with predominantly brown bodies and pale green legs.

[2] First instar nymphs are small and black, with circular bodies and white spots on the upper surface of the abdomen.

It takes around 41 days after eggs are laid for bugs to mature to adulthood.

[2][4] In New Zealand, pittosporum shield bugs are widespread but are not considered a pest.

[2] They are known to be attacked by Trissolcus basalis,[2] a parasitoid of pentatomid egg masses introduced into New Zealand in 1949 to control Nezara viridula.