Amongst annually occurring migrants from mainland Europe, one dragonfly is enjoying an especially good 2024 in my home county. Lesser Emperor (Anax parthenope) is common throughout southern Europe, with a long flight season from March to November, becoming progressively scarcer further north. I myself have observed them often enough abroad, but gained pictorial records of them only once since they are not inclined to settle. So when an apparently growing cluster was reported just outside Oxford at Radley Lakes I sensed an opportunity to while away a little mid-summer time.
This dragonfly is a bit smaller and rather more nondescript than the familiar, iridescent blue and bright green Emperor (Anax imperator) of any English summer. In males the waisted abdomen is dull brown with a black line running up the centre and a distinctive, pale blue saddle near the top; as our county recorder’s flight study from Radley (below) shows. The thorax is a greener-toned brown, and the eyes green. Lesser was first recorded nationally in 1996, with breeding first proven in Cornwall three years later. Since then sightings have become progressively more frequent as far north as Orkney, and further scattered breeding sites have been identified.
In the present season the first Oxon record, at Eynsham on 29th May (see here) caused quite a stir. Being a teneral it was considered to be a likely product of local breeding at any of various former gravel pit sites with restricted access in that area to the west of Oxford. Next, on 14th June a mature male was observed in the Standlake area of the Lower Windrush Valley GP complex (here). Then 10 days later came a first sighting from Radley Lakes, south of the city. By 21st July, two males and a tandem pair were being reported by Wayne and others from that historically productive location.
Hence on 24th I went to seek an added item for my near complete British dragonfly list. Arriving early at just after 9am, I set up at the Thrupp Lake (SU521975) watchpoint where most sightings were coming from and waited for a conversion as the day warmed up. There I practiced camera settings upon marginal vegetation on the off chance that a still cool subject might settle, and at 9:43 a Lesser Emperor flew into view out on the lake. The diagnostic blue saddle was clearly visible before the insect moved inshore and out of sight, so that was job done. I then checked a sunnier spot on the eastern side to find a regular Emperor was patrolling there, and hence concluded I was better off where I had started.
Scanning with binoculars I watched another territorial scuffle on the southern shore, and so hoped the eastern watchpoint would offer a hassle-free locality for the migrant. Other observers joined me, including the county recorder and Wayne, but that early sighting was as good as things got. At intervals large, dull-toned dragonflies would drift into view without another PI, and always to be chased off by an Emperor; the latter being highly territorial and aggressive. As the morning progressed conditions clouded over, a timely reminder of the frustrations of insect watching, and so we all left by midday.
Whilst I was thus engaged more tandem pairs were posted on Facebook by an unknown observer, from Pinkhill Meadow, Farmoor. That needed to be checked out since there was a spoof dragonfly sighting from the reservoir in the recent past, of an orange teneral Scarce Chaser. But once the county recorder clarified and down-sized the record there was only one place for me to go on a partly sunny Friday morning (26th). Ahead of arriving on site I could not remember the last time I had visited that long-time stomping ground, but on this day there was scope for evolving through new Odonata. That process was to be no easier this second time around than two days earlier
When I reached the Pinkhill hide (SP 440066) at around 10am Ian was there ahead of me, and soon afterwards called a first male Lesser Emperor that I couldn’t pinpoint. He also gained an indistinct but clearly diagnostic record shot that proved the earlier report was neither a hoax or mis-ID. We were shortly joined by a relieved county Odo recorder, and the three of us waited for around an hour while the grey stuff mostly enjoyed the upper hand over the sun. At one point a family of Water Rail emerged from right in front of our vantage point, the first time I can recall observing the fluffy, black chicks; and a Tufted Duck brood added to the “aaaw factor” out on the water.
A lot of Odo were active in the area before us – regular (or Blue) Emperor, Black-tailed Skimmers, a Brown Hawker, Darters and Damselflies – so why was my quest being so elusive? Then at 11:30 the male Lesser Emperor came into view again, and this time I made a good PI as it hovered in the middle distance. Shortly afterwards there was a second, closer fly-by so thus I had the sightings I sought and appreciated things were not likely to get better. There had also been an intervening call of a possible tandem pair, all of which strengthens the case for probable local breeding.
To the end of July further records issued from several more county wetlands: LWV Standlake Pit 60, Otmoor, Bodicote Reservoir near Banbury, Tar Lakes near Witney (see here), and Dorchester GPs. This dragonfly story seems likely to develop further in the current season given its subject’s extended flight period, but for now I have topped up my British dragonfly tally with a very agreeable optional extra.


























































