The night of 2nd August was brilliant. 89 species of moth wasn't a legendary total but there were some great quality moths and other insects among them. Pick of the moths was a rare, nationally scarce A moth that I had never seen before.
Cocksfoot Moth
Glyphipterix simpliciella is an exceedingly common species which can quite easily be found in their hundreds feeding in Ox-eye Daisies and other wildflowers during the day-time. I see them around North Elmham in abundance, but in four years of nightly light-trapping I have never caught a single individual in my garden. So when I found what looked very much like one in my moth trap, two thoughts went through my mind. First, this is a new moth for the garden, and second, given that
simpliciella doesn't normally come to my trap, might this be one of the rarer congeners that I've never seen before, anywhere?
At first I thought it was perhaps a little larger than
simpliciella that I'm used to seeing, which put me in mind of
haworthana - but in fact it wasn't nearly big enough for that (I measured it just to be sure). Easily observable external features ruled out all but two species - the very common
simpliciella and the much rarer
schoenicolella. The literature cites three differences in the external appearance of these two species - the colour of the cilia (hairs) on the edge of the hindwing, which are very hard to see on an insect that tends to keep its hindwings covered up, the relative spacing of the bars along the costa (the leading edge of the wings) and the eveness in colour of the forewing and extent of copper near the apex. Having looked at scores of pictures of both species on the internet I am not convinced of the reliability of any of these features except the colour of the cilia. The few glimpses I got of its hindwings looked encouraging - very encouraging in fact. I was pretty sure I could see brilliant white cilia there, near the base of the wings, but I couldn't get a clear enough view to be sure while the insect was still alive. When I could eventually examine it without it moving I was delighted to see glistening white cilia at the proximal end of the dorsal edge of both hindwings, strongly contrasting with the greyer cilia in the outer half or two-thirds. It had to be Bog-rush Fanner
Glyphipterix schoenicolella. That's an unexpected find here as it feeds on Black Bog-rush, a species that does not appear round according to the maps in
A Flora of Norfolk. It's not all that far away though, and with a widespread scattering of records across the county (including Dereham and Reepham areas) I imagine it is possible that it grows closer to here than the maps show.
Bog-rush Fanner Glyphipterix schoenicolella, North Elmham, 2nd August
I checked the genitalia too, just to make doubly sure, although looking at the images of female genitalia of both species online it wasn't very clear what the differences are. One website suggests a possible difference but I couldn't really see this on the images, and indeed the relavant bit of the genitalia seems to be hard to keep intact when preparing specimens as it is completely missing from most photos (although I did see it on mine during prepraration I had lost it by the time I finished). However, I think I can see two or three other differences between the two species:
- On both species the papillae anales, the very tip of the abdomen, have a tiny discrete projection at their very tip. On simpiciella this seems to be bigger, starting as a continuation of the more proximal section and narrowing gradually to form a point, whereas on schoenicolella this seems to start narrower than the adjacent more proximal section, so stepped at least on the outer side and is therefore tinier and sharper.
- Between the two papillae anales just below their broadest sections the membrane is covered in longitudinally wrinkled light sclerotisation. This seems to be thicker and more sclerotised on schoenicolella, though I'm not sure how much this could depend on how the genitalia are prepared.
- On both species the sclerotisation on the 8th segment is extended centrally into a triangular pointed projection pointing distally. On schoenicolella this projection seems to be shorter, just a little longer than an equilateral triangle and with straight sides coming to a point, whereas on simpiciella it is more horn-shaped, a longer clearly isosceles triangle with convex sides and a rounded or at least blunt tip.
These suggested differences are based on just a very small number of images so I cannot say that any of them are diagnostic, or with any great confidence that they should even be remotely useful. However if they do prove to be valid differences then my moth clearly meets all three criteria for
schoenicolella.
female genitalia of Bog-rush Fanner Glyphipterix schoenicolella, North Elmham, 2nd August
The second new moth for me was a slightly commoner species, Elm Midget
Phyllonorycter tristrigella. There are a number of similar species but on this one the third dorsal fascia is distinctively angled back in a sort of chevron shape. I was therefore fairly confident about this ID before chopping it, but as its genitalia are also quite distinctive I checked it under the microscope too.
Elm Midget Phyllonorycter tristrigella (male, gen det), North Elmham, 2nd August
There were a number of other new moths for the year too: Oak Bent-wing
Bucculatrix ulmella, Brown Rowan Argent
Argyresthia semifusca, 2 Heather Tortrixes
Argyrotaenia ljungiana,
Orange Swift,
Sallow Kitten and
Six-striped Rustic.
Oak Bent-wing Bucculatrix ulmella, North Elmham, 2nd August
Brown Rowan Argent Argyresthia semifusca, North Elmham, 2nd August
Heather Tortrix Argyrotaenia ljungiana, North Elmham, 2nd August
Orange Swift, North Elmham, 2nd August
Sallow Kitten, North Elmham, 2nd August
Six-striped Rustic, North Elmham, 2nd August
A few other species were noteworthy too: White-speckled Clothes Moth
Nemapogon koenigi, Pointed Slender
Parornix finitimella, Ruddy Flat-body
Agonopterix subpropinquella, Mouse-ear Groundling
Caryocolum fraternella,
Dark Umber and
Twin-spotted Wainscot.
White-speckled Clothes Moth Nemapogon koenigi, North Elmham, 2nd August
Ruddy Flat-body Agonopterix subpropinquella, North Elmham, 2nd August
Mouse-ear Groundling Caryocolum fraternella (male, gen det), North Elmham, 2nd August
The other moths were Bordered Carl
Coptotriche marginea, 3 Bird’s-nest Moths
Tinea trinotella, Blackthorn Slender
Parornix torquillella, Horse-Chestnut Leaf-miner
Cameraria ohridella, Bird-cherry Ermine
Yponomeuta evonymella,
4 Diamond-backs Plutella xylostella, Clover Case-bearer
Coleophora alcyonipennella, Woundwort Case-bearer
Coleophora lineolea, 2 Golden-brown Tubics
Crassa unitella, Long-horned Flat-body
Carcina quercana, Brindled Flat-body
Agonopterix arenella, Dark Neb
Bryotropha affinis, 2 Cinerous Nebs
Bryotropha terrella, 2 House Nebs
Bryotropha domestica, an
Oegoconia sp. that escaped, 4 Dingy Dowds
Blastobasis adustella, 2 Light Brown Apple-moths
Epiphyas postvittana, Maple Button
Acleris forsskaleana, 2 Garden Rose Tortrixes
Acleris variegana, Barred Marble
Celypha striana, 3 Rush Marbles
Bactra lancealana, Holly Tortrix
Rhopobota naevana, Bright Bell
Eucosma hohenwartiana, Hoary Bell
Eucosma cana, 3 Marbled Piercers
Cydia splendana, Codling Moth
Cydia pomonella, Pale-streak Grass-veneer
Agriphila selasella, 38 Straw Grass-veneers
Agriphila straminella, 24 Common Grass-veneers
Agriphila tristella, Chequered Grass-veneer
Catoptria falsella, 15 Water Veneers
Acentria ephemerella, Ringed China-mark
Parapoynx stratiotata, 4 Garden Pebbles
Evergestis forficalis, Pale Straw Pearl
Udea lutealis, 18 Mother of Pearls
Pleuroptya ruralis, 4 Grey Knot-horns
Acrobasis advenella, Dotted Oak Knot-horn
Phycita roborella, 2 Common Plumes
Emmelina monodactyla,
Maiden's Blush, Blood-vein, Small Fan-footed Wave, 4 Single-dotted Waves, 2 Riband Waves, 7 Red Twin-spot Carpets, 2 Dark-barred Twin-spot Carpets, 6 Common Carpets, Small Rivulet,
2 Maple Pugs, 2 Lime-speck Pugs, 2 Wormwood Pugs, Grey Pug,
Magpie Moth,
2 Bordered Beauties, 2 Early Thorns, Iron Prominent, Yellow-tail, 6 Dingy Footmen, Common Footman, Buff Ermine, Ruby Tiger,
3 Turnip Moths, 2 Shuttle-shaped Darts, 8 Flame Shoulders, Lesser Broad-bordered Yellow Underwing, 13 Setaceous Hebrew Characters,
Square-spotted Clay, 2 Common Wainscots, Copper Underwing, 2 Straw Underwings, Angle Shades, 2 Dun-bars, Dark Arches, Common Rustic,
Small Rufous and 9 Straw Dots.
Although the new moths were very exciting, neither of them were fully identified on the morning that I found them. Well neither was this lacewing, but I was pretty sure it would prove to be something I had never seen before. And so it turned out - it was
Hemerobius nitidulus, a pine-feeding species that had been recorded in Norfolk 5 times up to 1988 and not since, at least until the last summary publication of records that was published in 2016.
Hemerobius nitidulus, North Elmham, 2nd August
Other brown lacewings were
Hemerobius lutescens and 4
Micromus variegatus. Green lacewings consisted of
Chrysopa commata (new for the year) and
Dichochrysa flavifrons. The only mayflies were 5 Green Drakes
Ephemera danica, and once again all five were dead in the bottom of the trap. Caddisflies were
Hydropsyche pellucidula and 2
Hydropsyche siltalai.
Chrysopa commata, North Elmham, 2nd August
No new bugs for a change (lots recently) but a variety of species: Birch Shieldbug,
Blepharidopterus angulatus,
Lygus pratensis,
Psallus haematodes and the leafhopper
Empoasca vitis.
There was one more lifer waiting for me: a Lesser Mealworm Beetle
Alphitobius diaperinus. Also among the beetles the water-beetle
Rhantus suturalis was new for the year and there were 5
Bradycellus verbasci along with single
Hydrobius fuscipes and
Aphodius rufipes.
Lesser Mealworm Beetle Alphitobius diaperinus, North Elmham, 2nd August
Rhatnus suturalis, North Elmham, 2nd August
The following evening I had a wander round the Cathedral Meadows with a torch and found a selection of moths: Hawthorn Slender
Parornix anglicella, Common Mompha
Mompha epilobiella, Common Marble
Celypha lacunana, Rush Marble
Bactra lancealana, 2 Common Grass-veneers
Agriphila tristella, Pale Straw Pearl
Udea lutealis, 14 Mother of Pearls
Pleuroptya ruralis, Orange Swift, Blood-vein, Single-dotted Wave, Dark-barred Twin-spot Carpet, Yellow Shell, Coxcomb Prominent, Flame Shoulder,
Square-spotted Clay,
4 Silver Ys and Straw Dot. There were also 3 Common Earwigs, the green lacewing
Dichochrysa flavifrons and 2 Common Toads.
Orange Swift, North Elmham Cathedral Meadows, 3rd August