Currently viewing the category: "Robber Flies"
What's That Bug? does not endorse extermination

Subject: What is this thing?
Location: Durham, North Carolina
September 16, 2014 7:09 pm
Dear Bugman,
I came out of the store this afternoon and noticed these 2 creatures perched on my car. At first they were lined up, but then one turned around so their tails were touching. I’ve never seen anything quite like them! They appear to be a cross between a bee and a dragonfly? I’m quite curious to find out!
Signature: Thank You, Sarah Miles

Mating Red Footed Cannibalflies

Mating Red Footed Cannibalflies

Dear Sarah,
We are amused that you encountered a mating pair of Red Footed Cannibalflies, yet you composed your images to show only half of the pair.

Mating Red Footed Cannibalflies

Mating Red Footed Cannibalflies

What's That Bug? does not endorse extermination

Subject: Robber Fly
Location: Greenbrier Tennessee
September 8, 2014 6:36 pm
Took this today at work with my Samsung phone in Greenbrier Tn 37073
Signature: Jason Littlejohn

Red Footed Cannibalfly

Red Footed Cannibalfly

Hi Jason,
We have never posted more images of Red Footed Cannibalflies than we have this year.

What's That Bug? does not endorse extermination

Subject: hairy Cicada?
Location: Leesburg, VA
August 30, 2014 12:26 pm
Thought this might be a cicada, but I’ve never seen such a hairy one before or with such huge eyes.
Signature: Alicia

Red Footed Cannibalfly

Red Footed Cannibalfly

Dear Alicia,
This magnificent, predatory Robber Fly is commonly called a Red Footed Cannibalfly, and this summer we have received more than the typical number of identification requests of Red Footed Cannibalflies from our readership.

What's That Bug? does not endorse extermination

Subject: Predatory bee killer!
Location: Tucson, AZ
August 20, 2014 5:39 pm
This enormous predator buzzed down to enjoy its dinner on an elk antler in my yard – what is it?
Signature: Alicia

Giant Robber Fly eats Bee

Giant Robber Fly eats Honey Bee

Dear Alicia,
This is one of the best feeding Robber Fly images we have received all summer.  This is a Giant Robber Fly in the genus
Promachus, a genus well populated in our archives this season due to all the images we have received of Red Footed Cannibalflies.  This is a different member of the genus, and we believe it is Promachus albifacies, a species with no unique common name.  You can compare your individual to this image on BugGuide.

What's That Bug? does not endorse extermination

Subject: Stink bug eater
Location: Northwest Georgia USA
August 19, 2014 5:57 pm
I saw this huge fly eating on a stink bug at the pool. I took a photo of it thinking it may be a species of dragon fly. There were several Dragon flies around with honey bees in their mouths. . Any clue what this is?
Signature: Scott

Red Footed Cannibalfly eats Stink Bug

Red Footed Cannibalfly eats Stink Bug

Dear Scott,
This is a marvelous image of a Red Footed Cannibalfly that we can tag as Food ChainRed Footed Cannibalflies are large, predatory Robber Flies.

Thank you very much. I hope this fly stays around and eats all the stink bugs they can. I’m finding stink bugs in my home. The Red footed cannibal fly is welcome to eat all the stink bugs they can.

What's That Bug? does not endorse extermination

Subject: What is this?
Location: Lynwood Calfornia
August 17, 2014 7:16 pm
Can you help me identify this bug? I found him outside my door step
Signature: Not sure

Robber Fly:  Efferia species

Robber Fly: Efferia species

Dear Not sure,
This is a Robber Fly in the genus
Efferia, and though we went through numerous images on BugGuide, we could not find any that have the exact coloration of your individual.  You can compare your image to this image on BugGuide to see that the general physiology is the same.  According to BugGuide, there are:  “110 spp. in our area,” and “in our area, the vast majority are restricted to sw. US, with some widely western spp. and just two widespread spp.”  According to Eric Eaton, male Robber Flies in the genus Efferia:  “have the bulbous claspers, making them reasonably easy to identify.”  Just as we were about to post, we discovered this image of Efferia antiochi on Sardis & Stamm about the Antioch Dunes National Wildlife Refuge that looks identical to your Robber Fly.  According to the California Department of Fish and Game:  “Known only from Antioch, Fresno, and Scout Island in the San Joaquin River” which would indicate it is not the same species, but is sure looks close.

Robber Fly:  Efferia species

Robber Fly: Efferia species

We would strongly suggest that you contact the Los Angeles County Museum of Natural History as this might be a significant find.

Robber Fly:  Efferia species

Robber Fly: Efferia species

What's That Bug? does not endorse extermination