The Small White butterfly, one of the two "cabbage whites", has an elongated black mark at the back of the leading edge of the forewing but it is not curved round the corner like that of the Large White. The female (above) has two black spots on the topside of each forewing; in some cases it looks like three black spots, two of which are very close together.
The male Small White (above) has one black or grey spot on each forewing and the corner mark is usually less distinct than that of the female.
Both have a pale yellow underside slightly mottled with grey.
Small Whites coupled; smaller female has three small black dots together and one black blob.
Rarely, the male may appear completely white