After the heat of mid-day yesterday (
22nd August), we decided to re-visit Bald Hill, at the SW end of the
Aston Rowant NNR, when the afternoon started to cool a little. When we arrived, there was quite a cold Easterly wind blowing across the slope and, as on my previous visit, few butterflies were to be seen flying openly across the slope. It was quite late in the afternoon, when the wind dropped and the sun was still shining, that I began to realise, however, that
Silver-spotted Skippers were still abundant. They were keeping close to the ground and especially enjoying the Dwarf Thistles that dot the slope. My photo illustrates the very prickly nature of the vegetation, which makes getting down low to take photos a rather painful experience!

- Bald Hill, Aston Rowant NNR - 22nd August 2015
Olympus E-M5 with 40-150 mm lens - 1/500@f/7.1 ISO400
The most abundant butterfly species, by far, both on the open slope and the hedgerow that runs along the top, was the
Meadow Brown and I had plenty of opportunities to observe the variability of this species. The mating pair shown below, were still very flighty, despite being coupled together, and I had to stalk them very carefully to avoid alarming them. I've never noticed before that rather elegant 'deckled edge' to the trailing edge of the hindwings

- Bald Hill, Aston Rowant NNR - 22nd August 2015
Olympus E-M5 with 40-150 mm lens - 1/500@f/8 ISO400
The next example has rich colouring, with prominent eye-spots and a hint of a double pupil:

- Bald Hill, Aston Rowant NNR - 22nd August 2015
Olympus E-M5 with 40-150 mm lens - 1/500@f/7.1 ISO400
Whereas this one was much paler, with almost vestigial eye-spots:

- Bald Hill, Aston Rowant NNR - 22nd August 2015
Olympus E-M5 with 40-150 mm lens - 1/250@f/5.6 ISO400
I often notice how an area that seems rather barren at first, begins to reveal far more species, as one 'gets one's eye in'. In this case, I was soon seeing
Chalkhill Blues, although most were in very worn condition, and
Common Blues. One very small example (more like a Small Blue in size), turned out to be a very blue female Common Blue and, when she was pursued by a normal-sized male, she seemed only about half his size in linear dimensions. Unfortunately, I was unable to get photos of the pursuit but have attempted to illustrate their relative appearance with the aid of the Dynamic Auto Painter software and some separate images.
![CmnBlueMontage-[800x600].jpg (78.33 KiB) Viewed 869 times Bald Hill, Aston Rowant NNR - 22nd August 2015<br />DAP image from photographs](./files/thumb_11310_42047f41d05daaa2ed7070bdd3d4ff12)
- Bald Hill, Aston Rowant NNR - 22nd August 2015
DAP image from photographs
and a 'straight' photo of the very small female
Common Blue on her own:

- Bald Hill, Aston Rowant NNR - 22nd August 2015
Olympus E-M5 with 40-150 mm lens - 1/640@f/8 ISO400
Another
Common Blue chose a particularly spiky perch on which to pose (
can anyone identify the plant for me, please):

- Bald Hill, Aston Rowant NNR - 22nd August 2015
Olympus E-M5 with 40-150 mm lens - 1/500@f/8 ISO400
A few years ago,
Pauline noticed that the antennae of Large Skippers are differently coloured between the two sexes. Several of my photos (including the one above) show a bright yellow/orange underside to the antenna tips of
Silver-spotted Skippers, whereas the female shown below appeared to have completely dark antennae tips

- Bald Hill, Aston Rowant NNR - 22nd August 2015
Olympus E-M5 with 40-150 mm lens - 1/800@f/10 ISO400
I haven't yet examined enough photos to know whether this distinction holds for most SSS but this is the time of year to start checking.
I mentioned before the spiky nature of the vegetation on chalk downland, which makes getting down for photos distinctly uncomfortable. I came across this rather attractive group of Carline Thistles, which looks particularly dry and spiny, even though the flowers are actually quite fresh:

- Bald Hill, Aston Rowant NNR - 22nd August 2015
Olympus E-M5 with 12-50 mm lens - 1/160@f/7.1 ISO400
Mike
ps I mentioned in earlier posts that I was having difficult with my Olympus 12-50 mm lens. WEX Photographic have now replaced this lens under warranty