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Friday, 3 September 2021

Maenol 03/09/2021

I had two actinic traps out last night and they attracted more moths than I've seen for some time.  The most abundant species were, unsurprisingly, Brimstone Moth and LYU, closely followed by Flame Shoulder, Square-spot Rustic, Rosy Rustic, and Copper Underwing.  Amongst the micros there were numbers of Acleris laterana/comariana and a Dichrorampha species, probably D.acuminatana, which I have also seen about the garden during the day:

Dichrorampha acuminatana (?)

I also came upon a very dark, almost black, Pyralid which I've been unable to put a name to:

It bears a strong resemblance to published images of  both Apomyelois bistriatella and Matilella (Pyla) fusca, and it may not be possible to distinguish between the two visually.  Advice would be much appreciated.


  1. It looks like Pyla fusca to me, I have had it a few times in my trap.

  2. Thanks Adam, but I have a dilemma here, the Facebook Group that I consult reckon that the white cross-lines match A.bistriatella and are too well-defined for P.fusca. It would be good to have some more local input but don't hold out too much hope of it coming.

  3. I have had two moths here in Pembs which were reckoned to be Pyla fusca and they look just like yours. Very dark grey, pretty well black, with two indistinct but definite white crosslines. There are 20 records for it in Pembs but only 4 for Apomyelois bistriatella and none recently. I see that the latter is dependant on burnt gorse whilt M. fusca just likes to perch there.I do agree with you the the pictures on the web are more-or-less indistiinguishable except that M. Fusca tends to be darker. Roseamry Royle

    1. Thank you very much for your input, Rosemary. I'm not sure that bistriatella is exactly dependant on burnt gorse, rather one of the options, another being that it could be an immigrant. In the end it will be up to our CMR to decide.

  4. I see on Micro-moth Identificatoin Facebook another moth has been identified as Pyla fusca and that is pretty well all black.

  5. I've seen that Facebook post, Rosemary, as you say the moth was almost black, the discal spots are visible but no pale cross-lines. It was identified as fusca by Ben Sale, the same person who had identified my moth as Apomyelois bistriatella on the previous day (September 4th)!

  6. Hi Chris, Can you post here when you get a final answer please? I am seroiusly wondering if my Pyla fuscas are wrongly identified! Rosemary

  7. I've consulted Sam Bosanquet, Rosemary, and he thinks that my moth is Pyla fusca so I'm going with that - he's the CMR!