23 Jul 21

Priorslee Lake and The Flash

17.0°C > 16.0°C: Clear early with low cloud arriving from the E by 05:30. Light / moderate E breeze. Good visibility.

Sunrise: 05:15 BST

* = a photo today

Priorslee Lake: 04:15 – 06:00

(155th visit of the year)

A shorter than usual visit with just a single lap before leaving for The Flash and then away.

Bird notes:
- One or more Swifts heard screaming overhead but not seen in clear hazy sky. Later a single bird low over.
- A small number of House Martins heard calling high overhead at 05:15 but also not visible against the hazy sky
- No Blackbird song heard.

Overhead:
- 4 Canada Geese: outbound together
- 1 Lesser Black-backed Gull
- 12 Wood Pigeons
- 4 Rooks

Hirundines etc., noted:
- 2 House Martins

Warblers noted (the number in brackets is singing birds):
- 4 (3) Chiffchaffs
- 1 (1) Sedge Warblers still
- 6 (3) Reed Warblers
- 6 (5) Blackcaps
- 1 (1) Common Whitethroat

Count from the lake area
- 2 + 5 (1 brood) Mute Swans
- 10 (9♂) + 2 (1 brood) Mallard
- 2 Moorhens
- Coots not counted
- Great Crested Grebes not counted
- 17 Black-headed Gulls: no juveniles
- 2 Grey Herons

On / around the street lamps pre-dawn:

Moths:
- 1 Common Grass-veneer (Agriphila tristella)
- 1 Common Plume (Emmelina monodactyla)
- *1 unidentified grey (Scoparia/Mercurella sp.)
- 1 Round-winged Muslin (Thumatha senex)
- *1 Willow Ermine (Yponomeuta rorrella)
- *1 Common Pug (Eupithecia vulgata)
- *1 Red Twin-spot Carpet (Xanthorhoe spadicearia)
- *1 Ruby Tiger (Phragmatobia fuliginosa)

And
- *1 Caddis fly sp.
- 2 Rough-haired Lagria Beetle (Lagria hirta)
- *1 Common Red Soldier Beetle (Rhagonycha fulva)
- 1 Red-legged Shieldbug (Pentatoma rufipes)
- 1 Cucumber Green Orb Spider sp. (Araniella cucurbitina?)
- 2 Bridge Orb-web Spiders (Larinioides sclopetarius)
- 1 Dicranopalpus ramosus agg. [harvestman]

In the sailing club shelter pre-dawn:

Spiders:
- 3 Bridge Orb-web Spiders (Larinioides sclopetarius)

Other things seen later:
- Hawker sp. Dragonfly flushed at 05:20

Nothing else seen

As I noted yesterday with the ermine moth at The Flash some individuals cannot be identified. However I think the grey suffusion towards the wing-tip points to it being safely identified as a Willow Ermine (Yponomeuta rorrella).

This is one of the difficult 'grey' moth group. I was unable to get a better angle on this specimen that I am going to pass on at the moment. It looks too contrasting for a Common Grey and the dark area on to the inner edge of the forewing near the wing-tip seems atypical as is the dark wavy line running from there to the wing-edge.

My heart sinks when I see a pug moth – many are tricky to separate. I think this is a Common Pug (Eupithecia vulgata).

After considerable deliberation I have concluded this moth is the dark form of Red Twin-spot Carpet (Xanthorhoe spadicearia). The outer edge of the central band does not seem jagged-enough for a Dark-barred Twin-spot Carpet (Xanthorhoe ferrugata).. The harvestman with it is one of the species pair Dicranopalpus ramosus/caudatus.

Always a delightful moth to see is this Ruby Tiger (Phragmatobia fuliginosa). Has a matching Common Red Soldier Beetle (Rhagonycha fulva) for company.

Later it turned around for another view.

A typical caddis fly easy to separate from any moth by the strong venation of the wings. Also, like many caddis flies, the forward-pointing antennae are held in a curve: this is true of some moths so not a reliable characteristic.

(Ed Wilson)

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Between the lake and The Flash:
-
 1 Blackcap singing by the lower pool again.

(Ed Wilson)

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On the roof of the Priorslee Avenue tunnel

- 1 Common Green Lacewing (Chrysoperia carnea)
- 1 Red-legged Shieldbug (Pentatoma rufipes)
- *2 craneflies, one a Tipula lateralis.

There were two craneflies, this one being Tipula lateralis. It is unusual in having a pale line down the centre of its abdomen. The pale mark on the leading edge of the wing is present in several other species. It is associated with running water and of course the Wesley Brook runs through the tunnel. Like many species of crane fly it has a long flight-period from April to October. Shown clearly here are the halteres: in true flies the hind-wings are reduced to small pin-shaped bodies that are used like gyroscopes to help them maintain orientation.

(Ed Wilson)

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The Flash: 06:05 – 06:50

(140th visit of the year)

Bird notes:
- All the Moorhen juveniles seemed to be out on the water despite the now overcast conditions.
- The pesky Great Crested Grebe back again.
- A Grey Heron: my first here since 28th June.

Birds noted flying over here:
- 1 Jackdaw

Hirundines etc., noted:
None

Warblers noted (the number in brackets is singing birds):
- 2 (0) Chiffchaffs
- 1 (0) Blackcap

On /around the water:
- 96 Canada Geese
- 38 Greylag Geese
- 1 Greylag x Canada Goose still
- 3 + 2 (1 brood) Mute Swan
- 18 (?♂) Mallard
- 30 (?♂) + 4 (1 brood) Tufted Duck
- 4 + 1 (1 brood) Moorhens
- 11 juvenile Coots (7 broods)
- 1 Great Crested Grebe
- 13 Black-headed Gulls: no juveniles
- 1 Grey Heron

On various lamp poles:
- 1 Common Wasp (Paravespula vulgaris)
- 1 Grouse Wing (Mystacides longicornis) [caddis fly]
- 2 other different caddis fly sp.
- 1 Dicranopalpus ramosus agg. [harvestman]
- 3 Leiobunum rotundum-type harvestmen

Neil Nash agrees with my identification yesterday of the Grey Ermine (Yponomeuta sedella).

(Ed Wilson)

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On this day
2020
Priorslee Lake
Today's Sightings Here

2019
Priorslee Lake
Today's Report Here

2014
Priorslee Lake
Today's Report Here

2012
Priorslee Lake
7 Skylarks
(John Isherwood)

2006
Priorslee Lake
Common Tern
(Ed Wilson)