Green-veined White
Pieris napi, Hutchinson's bank
From UK Butterflies
This is a common butterfly of damp grassland and woodland rides and is often mistaken for its cousin, the Small White. It can be found from spring through to autumn in parks and gardens, as well as less-urban areas such as meadows and woodland rides. The so-called green veins on the underside of the adults are, in fact, an illusion created by a subtle combination of yellow and black scales. This is one of the most widespread species found in the British Isles and can be found almost everywhere although it is absent from Shetland and areas of the Scottish Highlands. It is also a highly-variable species and populations have been distinguished based on an analysis of androconial scales as documented in Warren (1967), Warren (1968), Thomson (1970b) and other articles.