This year I got the distinct impression that male brimstones were on the wing a week to ten days ahead of the females. Does anyone agree? Is this typical? I believe this is normally the case with orange tips, but I've not seen it mentioned for brimstones.
Simon C
Female laying eggs,
Primrose Hill community wood, Bath
![Image](http://www.bath.ac.uk/~pyssc/butterflies/brimstone_s.jpg)