While temperatures varied slightly within Zone I, with an average of 20°C (1:04 PM), and weak to moderate winds remain fairly constant throughout this field trip, cloud cover increased from partly cloudy to overcast as soon as I reached Zone II.
+-------------------------+---------------------------------+--------+
| Species | Location | Status |
+-------------------------+---------------------------------|--------+
| Aglais urticae | Zone III | Adult |
|-------------------------|---------------------------------|--------|
| Boloria dia | Zone I / II | Adult |
|-------------------------|---------------------------------|--------|
| Coenonympha arcania | Zone I | Adult |
|-------------------------|---------------------------------|--------|
| Coenonympha pamphilus | Zone I | Adult |
|-------------------------|---------------------------------|--------|
| Maniola jurtina | Zone I | Adult |
|-------------------------|---------------------------------|--------|
| Melanargia galathea | Zone I | Adult |
|-------------------------|---------------------------------|--------|
| Pieris napi | Mixed Field / Zone I / III | Adult |
|-------------------------|---------------------------------|--------|
| Pieris rapae | Mixed Field / Zone I / II | Adult |
|-------------------------|---------------------------------|--------|
| Polygonia c-album | Zone III | Adult |
|-------------------------|---------------------------------|--------|
| Polyommatus bellargus | Zone I | Adult |
|–------------------------|---------------------------------|--------|
| Thymelicus sylvestris | Zone I | Adult |
|-------------------------|---------------------------------|--------|
|–------------------------|–--------------------------------|--------|
| Coenagrion mercuriale | Zone II | Adult |
+-------------------------+---------------------------------+--------+
I still managed to make the best out of it and used the only mowed path on the Cherry Hill to discover C. arcania, M. galathea and T. sylvestris kicking off their seasons. Initially missed, one B. dia that nearly hit my right eye in Z II was enough to confirm that a new population is establishing itself in Z I.
A tiny surprise was a single P. bellargus, which is rather unusual. With all blues currently undergoing their respective generational changes, I used to observe a single P. icarus during 2023 and 2024 but not a single P. bellargus. This effectively confirms that P. bellargus has become the most common blue in my main study area, surpassing P. icarus.
---
Note (20 June): I misidentified B. dia as M. athalia based on a poor description provided by my mother who accompanied me. This has been corrected.