Nature Notes columnist Jono Forgham covers your fortnightly look at nature around Bishop’s Stortford Some years ago I was wandering around Hatfield Forest, recording dragonflies and damselflies. In one ride I encountered an unusual, very pale damselfly in good numbers. I managed to get a series of close-up photos that proved these to be white-legged damselflies, a new species for me and, as it transpired, a new species for the forest. All the ones I observed that day were immature ones, known as teneral. Early last week I decided to return to the forest to see if they were still present, as we…