Green-veined White
This small butterfly favours the damp areas, and woodland edges, so can often be found in Section 3 of the route. In flight it can be difficult to distinguish from the Small White, so was possibly under-counted in the first couple of years. Emerging in small numbers for a first brood typically in late April, the peak of sightings come in July, when a more numerous second brood is on the wing, and small numbers can be seen through August.
total seen
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... the stats box
22 5 25th April 14th August
17 4 22nd April 15th Sept
50 14 23rd April 10th Sept
29 10 18th April 27th August
73 14 26th April 2nd Sept
64 11 18th April 15th Sept
36 7 6th May 7th Sept
14 4 27th April 28th August