#WorldRobberFlyDay
For #FlyWeek and #WorldRobberFlyDay, here's a male Efferia benedicti in the grasslands of the Okanagan Valley, British Columbia, Canada.
April 30, 2025 at 9:59 PM
#FlyWeek #WorldRobberFlyDay Fossil head of a Lasiopogon robber fly discovered in a 16,500-year-old Arctic Ground Squirrel midden in Yukon, Canada. Several species of the genus are common in the region today. See doi.org/10.4039/tce....
April 30, 2025 at 10:12 PM
TIL that there's a #WorldRobberflyDay. To celebrate, here's Archilestris magnificus, a leggy tarantula hawk-mimic big enough to intimidate hummingbirds. Like many of Arizona's most sought-after birds, it's a Mexican species that rarely strays north of the border. www.inaturalist.org/observations...
May 1, 2025 at 1:50 AM
robberfly- 1
wasp- 0
Happy #worldrobberflyday everyone!
November 23, 2024 at 5:23 AM
Sadly, I missed #worldrobberflyday - but here’s some Leptarthrus brevirostris from Lochawe (VC98) last week. Excellent numbers, so a big local emergence, of a species that is near annual at the site @dipteristsforum.bsky.social @uk-soldierflies.bsky.social
May 30, 2025 at 8:51 PM
Almost forgot #WorldRobberFlyDay but luckily reminded by @flygirlnhm.bsky.social. Here's the puparium of Laphria flava (Bumblebee Robberfly) collected from a pine log in Abernethy Forest a few years back. @dipteristsforum.bsky.social #diptera #ento #macro
April 30, 2025 at 12:45 PM
At the @nhm-london.bsky.social we have hundreds of drawers of Asilidae, & receive requests from all over the world for either physical or digital loans

Check out these big un’s in the genus Hyperechia that I imaged for a recent request (these images are just for labels & size)

#worldrobberflyday
April 30, 2025 at 7:52 PM
Mallophora bomboides is called the 'bee killer' because, well, you get the idea...
#worldrobberflyday
November 23, 2024 at 5:16 AM
My first tweet 10 years ago was a robber fly photo on #worldrobberflyday. Saw this robber fly today, thought it'll be a good post to start with on my new BlueSky account. Eye-to-eye, a Fly is eating a Fly....
May 29, 2025 at 11:56 PM
For #WorldRobberflyDay I give you Leptogaster guttiventris recorded in my Norwich garden in 2021 and Laphria flava from Abernethy Forest in 2024.
April 30, 2025 at 5:27 PM
For #WorldRobberFlyDay here's an edit I made showcasing how cool these flies are 😎
April 30, 2025 at 4:12 PM
#WorldRobberFlyDay
#FlyWeek ... More robber fly portraits: Dioctria pusio, Laphria index, Stenopogon inquinatus. All from The Okanagan Valley, British Columbia, Canada. Photos: Werner Eigelsreiter.
April 30, 2025 at 11:15 PM
#WorldRobberFlyDay

photographing assassin flies in nature has been a passion (scientific specimen more important to me than a photo though) - using Olympus SLR camera to capture Hoplistomerus nobilus (Loew, 1858) (Laphriinae) on slide film at Het Bad NR, Limpopo, South Africa in 2005

#FlyWeek
April 30, 2025 at 9:46 PM
#WorldRobberFlyDay

assassin flies + their prey are fascinating - here Diogmites nigripennis (Macquart, 1847) (Dasypogoninae) with wasp prey - USNMENT00832604 - Costa Rica: Estación Biológica La Selva, 2010-08-19 - full details here n2t.net/ark:/65665/3...

#FlyWeek
April 30, 2025 at 9:37 PM
Dioctria oelandica, from 2006 the first specimen in my Diptera collection for #WorldRobberflyDay
December 3, 2024 at 8:48 AM
Remember #FlyWeek April 30th to May 6th starting with #WorldRobberFlyDay
Prelude, female Choerades ignea just before ovipositing....
April 24, 2025 at 12:32 PM
Can you believe it? It’s #WorldRobberflyDay. Where has the year gone?
This is Neodiogmites melanogaster, named for its black abdomen, as if the abdomen, not those screaming red legs, was so noteworthy. 📷: Rogerio Dias CC BY-NC 4 in Rio de Janeiro, #Brasil. #Diptera #Asilidae 🧪 #entomology
April 30, 2024 at 10:18 AM
Worth a retweet for #WorldRobberflyDay Worth reading the replies too. https://twitter.com/PeteBrash/status/1142195616258428928
November 17, 2024 at 2:33 PM
The @nhm-london.bsky.social recently hosted Greg Daniels - a superb Australian Asilidae expert

He moans that he is physically aging but the boy is bright as a button when it comes to going through the collection to figure out what’s what

#worldrobberflyday
April 30, 2025 at 7:14 PM
#WorldRobberFlyDay

1 of my favorite collecting sites - eastern-most sand dunes of #Namib Sand Sea at road C14 in Namibia - collected 10 species during 6 visits
Afroholopogon sp
Anasillomos chrysopos
Anasillomos juergeni
Anypodetus fasciatus
Anypodetus leucothrix
Astiptomyia bikos

#FlyWeek
April 30, 2025 at 9:58 PM
#WorldRobberFlyDay

fossil assassin flies are amazing but also (sometimes) difficult to place taxonomically + phylogenetically
Burmese amber (100 mya) - Burmapogon bruckschi
Baltic amber (45 mya) - Protoloewinella keilbachi
Dominican amber (20 mya) - Schildia martini

#FlyWeek
April 30, 2025 at 7:46 PM
Happy #WorldRobberFlyDay !!!

a neat, beautiful, + diverse genus is Afroholopogon Londt, 1994 with 18 species endemic to Afrotropical Region - here an undescribed species from sand dunes of #Namib Desert (Namibia) perching on low, dead vegetation - tiny aerial predators of other insects

#FlyWeek
April 30, 2025 at 6:28 PM
Happy #WorldRobberFlyDay ! These are the biggest and smallest Asilids I have seen, Red-footed Cannibal Fly from Atlanta area and Variable Pixie from Sandhills NWA in southwest GA. #insects #invertebrates Wish I saw these cool creatures more often!
April 30, 2025 at 1:44 PM
Another fine hirsute Robberfly for #WorldRobberFlyDay, described by Jason Londt - the whole lateral image of Sisyrnodytes dasykylon Paratype, NHMUK014034877

This gets its name from the Greek dasys (thick with hair, shaggy) & kylon (parts below eyes). (Big mystax with extra setae)
April 30, 2025 at 3:56 PM
For #WorldRobberFlyDay I'd like to show off some of the cool robber fly merch I've gotten from some super talented artists! The plush Proctacanthus is definitely one of my favorites, so she gets to sit on some of my favorite fly books! 😍 #FlyWeek #entomologistsareeasytogetgiftsfor
May 1, 2025 at 3:36 AM