Limenitis reducta
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Provence, July 2004
A group drinking, Provence, July 2004
A male guarding his territory - Switzerland, May 2007
Switzerland, August 2007
Switzerland, August 2007
Switzerland, August 2007
Switzerland, June 2005
Caterpillar, May 2014
The metallic blue of the upperside of this insect is unmistakeable. White admirals, by contrast, are brown, more rounded, and also have a double rather than single row of post-discal/submarginal dark spots on the upperside and underside of the hindwing. Although the typical habitats of the two species are rather different they do occasionally fly in the same places - I know one river valley in Switzerland where both fly - so care has to be taken to distinguish them. However, the jizz and behaviour are so different it is rare for real confusion to arise.
In the northern parts of its range, including Switzerland, there is usually just one brood a year. Further south - and some years in Switzerland - there are two broods. The single brood usually flies from late May to early August. When there are two broods, the first flies from April to June and the second from late July into September. Caterpillars have similar habits to white admiral caterpillars, like them hibernating in a hibernaculum.