The Lizard Log

The Langkilde Lab in Action


1 Comment

No, it’s not the name of a cool new band you haven’t discovered yet; the Hanging-thieves are a genus (Diogmites) of robber flies that is known for hanging by one or two legs from a perch site while consuming their prey. Robber flies (family Asilidae) are also known as assassin flies, because they catch other bugs while on the wing and eat them with their piercing mouthparts. In general, robber flies are considered to be beneficial, as they eat many pest insects.

A hanging-thief chows down on a freshly caught wasp .

A hanging-thief chows down on a freshly caught wasp .

I was lucky enough to stumble upon a Hanging-thief (it looks like Diogmites salutans) as it was engrossed in eating a wasp. The robber fly was perched on one of my AED’s (Armadillo Excluder Devices), small wire cages that I set up to protect my fake lizard nests from predation by wily armadillos (that story another time…). The fly had already paralyzed its prey with venom, which also contains enzymes which liquefy the prey’s innards (as in spiders). As I watched, the robber fly carefully manipulated the wasp, turning its body over and around, and inserting its proboscis into likely sites, as if its prey were some sort of delicious juice box. In the video below, you can see the mouthparts of the fly working to slurp up its presumably delicious meal.

My favorite part of seeing this robberfly was observing its moustache, or mystax, which is so tough that it may help protect the fly from injury when it is subduing struggling prey.

Who wore it better: Diogmites or Ron Swanson?

The mystax is among the most fearsome of moustaches in the animal kingdom.

Author: Chris Thawley

Visiting Professor at Davidson College; evolutionary ecologist, herper, lizard lasso-er, cookie monster, discslinger

One thought on “Hanging-thieves!

  1. Wow, what an amazing video! I just found my first hanging thief today and posted it on inaturalist. I’m not sure I got the species right but when I looked it up on google this was one of the first results. So cool!

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s