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Rob Edmunds @vc28nature.bsky.social · 13/09/2026

Reposted by Ian Andrews

A sawfly miner I don’t find very often - Heterarthrus microcephalus. Forms tip blotches on Willows. This is from Weeping Willow today in the garden

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Ian Andrews @suillia.bsky.social · 13/09/2026

Fungi are appearing in woods now, marking the start of Suillia season, as these spiny-winged flies hold territory atop their chosen cap. Suillia notata here at Cali Heath @yorkswildlife.bsky.social reserve today. ID help here... dipterists.org.uk/heleomyzid-s... @dipteristsforum.bsky.social

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Ian Andrews @suillia.bsky.social · 12/09/2026

It's that late summer time of year when parasitic tachinid flies are abundant...these all in numbers at the @ldvnnr.bsky.social centre at Bank Island yesterday. Tachina fera, Linnaemya picta, Phasia obesa and Voria ruralis...bugs and moths beware! @ynuorg.bsky.social @dipteristsforum.bsky.social

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Ian Andrews @suillia.bsky.social · 12/09/2026

Still nice variety of hoverflies outside the @ldvnnr.bsky.social centre at Bank Island yesterday. Cheilosia proxima, Dasysyrphus albostriatus, Dasysyrphus tricinctus and Syrphus ribesii. @ynuorg.bsky.social @dipteristsforum.bsky.social #hoverflies #syrphidae

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Reposted by Ian Andrews

Lisa Williams @lisawilliams30.bsky.social · 12/09/2026

What a fly!! Cynomya mortuorum, only my 2nd ever and a 1st for #RSPBMiddletonLakes, 12/09/26 @dipteristsforum.bsky.social #Calliphoridae #Diptera

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Ian Andrews @suillia.bsky.social · 12/09/2026

And what a name...the Dog Fly of the Dead! One of my top ten flies for sure. Great photos. 😀

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Ian Andrews @suillia.bsky.social · 10/09/2026

That eye pattern makes me wonder about Sargus flavipes.

Ian Andrews @suillia.bsky.social · 10/09/2026

Tachina magnicornis has clearly loved the hot summer...a species new to Yorkshire, but outnumbering Tachina fera in East Yorkshire wherever I am looking at the moment. A huge influx from the south it appears. @dipteristsforum.bsky.social @ynuorg.bsky.social @northcavewet.bsky.social

A female Tachina magnicornis feeding on top of a Mayweed flower at North Cave Wetlands in East Yorkshire. A parasitic fly similar to the common Tachina fera, but with a broader frons, dark front tarsi and a narrow abdominal stripe.

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Ian Andrews @suillia.bsky.social · 10/09/2026

Not one I know, Lynda, but you could well be right. I find these tephritids quite tricky from photos. 🙂

The Species Recovery Trust @speciesrecovery.bsky.social · 31/08/2026

Reposted by Ian Andrews

Scientists study this rare fly using ... grapefruits A thread for #SpeciesOfTheWeek ⤵️

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Ian Andrews @suillia.bsky.social · 06/09/2026

Yes, that is definitely fera...nice. 🙂

Soldierflies and Allies Recording Scheme @uk-soldierflies.bsky.social · 24/08/2026

Reposted by Ian Andrews

There have been convincing records in 2026 of Buff-tailed Villa (V. hottentotta) in Kent and Essex. Please check carefully if you find something that looks like Dune Villa (V. modesta) but in locations away from the dune habitats.

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Ian Andrews @suillia.bsky.social · 26/08/2026

Lots of action around exposed sand banks at Allerthorpe Common @yorkswildlife.bsky.social reserve today. Astata boops seems well established there now and Green Tigers, Ammophila sabulosa, Anoplius nigerrimus all very active in the sun. Super little reserve. 🙂 @ynuorg.bsky.social #hymenoptera

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Ian Andrews @suillia.bsky.social · 21/08/2026

Could well be, yes. I prefer a specimen to check to be sure. 🙂

Ian Andrews @suillia.bsky.social · 21/08/2026

Infuscated cross-veins and I don't think there are spots on T4, so should be podagrica (common) or obliqua (which likes Butterbur).

Ian Andrews @suillia.bsky.social · 11/08/2026

Could be...I'm a bit of a coward when it comes to Cheilosia from photos!

Ian Andrews @suillia.bsky.social · 10/08/2026

Yes, looks right...they do vary considerably in size.

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Ian Andrews @suillia.bsky.social · 08/08/2026

It's great visiting remote areas up top... everything is a dot on the map!

Erica McAlister @flygirlnhm.bsky.social · 07/08/2026

Reposted by Ian Andrews

Heads up folks Some Tabanidae that were sampled from the Canopy Tower at the Soltis Center, Costa Rica These images show both differences in eye patterns & antennal branching. Sadly the eye patterns disappear as they desicate so images are important #FlySchool2026 @dipteracourse.bsky.social

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Ian Andrews @suillia.bsky.social · 07/08/2026

Amazing, aren't they! They are all out there at the moment, just takes a lot of time staring into bushes. 😂

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Ian Andrews @suillia.bsky.social · 07/08/2026

The fly's a Pollenia...the shifting pattern changes depending on the angle of view.

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Ian Andrews @suillia.bsky.social · 07/08/2026

Sawfly larvae from Allerthorpe Common, East Yorkshire this am. Cimbex connatus, C. luteus, Euura miliaris and Hemichroa crocea. Was hoping for a Cimbex hat-trick, but femoratus proved elusive! @ynuorg.bsky.social @yorkswildlife.bsky.social #symphyta #yorkshiresawflies

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Ian Andrews @suillia.bsky.social · 03/08/2026

Yes, T. colon sensu lato, as can't rule out T. semicolon. Nice photo. 🙂

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Ian Andrews @suillia.bsky.social · 25/07/2026

The Eristalis of the woodland glades. 🙂

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Ian Andrews @suillia.bsky.social · 23/07/2026

That's her front leg. 🙂 That's also an odd common name...it's not a drone fly, so where does that come from, I wonder?

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Ian Andrews @suillia.bsky.social · 21/07/2026

Delighted to find Thereva valida (Dark Northern Stiletto) at Ashberry yesterday. A rare stiletto fly, but with known population on south side of North York Moors. Thanks to @kitenet.bsky.social for confirming from photos. @uk-soldierflies.bsky.social @dipteristsforum.bsky.social @ynuorg.bsky.social

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Ian Andrews @suillia.bsky.social · 13/07/2026

Senotainia conica (Small Shadower Fly) at Cali Heath @yorkswildlife.bsky.social reserve, lurking around Oxybelus uniglumis nests outside rabbit burrows, waiting to lay an egg on the wasp's diptera catch. Rabbit droppings make perfect watchpoints! @dipteristsforum.bsky.social @ynuorg.bsky.social

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Ian Andrews @suillia.bsky.social · 06/07/2026

Maybe...not a family I know. Facebook UK Diptera might be worth a go...Tony Irwin might know.

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Ian Andrews @suillia.bsky.social · 05/07/2026

Clouds of butterflies today at Cali Heath @yorkswildlife.bsky.social reserve. Marbled White seems to be particularly widespread locally this year...over 30 here earlier in the week. @ynuorg.bsky.social @bcyorkshire.bsky.social @celastrina59.bsky.social

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Ian Andrews @suillia.bsky.social · 03/07/2026

Different species, but in the same subfamily within Tachinidae.

Ian Andrews @suillia.bsky.social · 03/07/2026

Eupeodes corollae and Episyrphus balteatus...just two of many hoverflies, blow flies and wasps with orchid pollinia attached to their faces; at a North York Moors site this morning, around Marsh Helleborine, Fragrant orchid and more. @dipteristsforum.bsky.social @ynuorg.bsky.social #pollinators

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Ian Andrews @suillia.bsky.social · 03/07/2026

Ectophasia crassipennis...very nice. Whereabouts? It's moving north...only arrived in the south a few years ago.

Ian Andrews @suillia.bsky.social · 01/07/2026

Leptometopa latipes (Milichiidae)...2-3mm freeloader fly. Seem to be few records nationally, but conservative estimate of 5000 today at Bempton Cliffs, where I suspect they associate with seabird guano. They were all over the cliff edge hand rails! @dipteristsforum.bsky.social @ynuorg.bsky.social

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Ian Andrews @suillia.bsky.social · 14/06/2026

I think the former, but away at the moment, so can't check. 😀

This one was outside in a row of bargain-price trees. Saw a female 28th May and then 11 days later potted this one in exact same spot (same individual...maybe not?). Interestingly, the apple tree had fungi growing from the pot and there were also a few male C. cristatus in that one spot only.

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Interesting, thanks...it really is spreading suddenly at quite a pace!

Tree Snipefly (Chrysopilus laetus) new to Yorkshire at garden centre in Shiptonthorpe VC61 . Seen 11 days ago but no pot with me...thankfully still on same apple tree today! Maybe garden centres explain the spread north? @uk-soldierflies.bsky.social @dipteristsforum.bsky.social @ynuorg.bsky.social

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Seems to be happening a few times recently...

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Ian Andrews @suillia.bsky.social · 06/06/2026

Drino lota, a tachinid fly whose larvae are parasitoids of Elephant Hawk-moth caterpillars. A regular denizen each year of the Rosebay Willowherb at Cali Heath @yorkswildlife.bsky.social reserve. @dipteristsforum.bsky.social @ynuorg.bsky.social

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Yes, Obsidentify is pretty good!