giant robber fly

(Promachus vertebratus)

Conservation Status
giant robber fly (vertebratus)
  IUCN Red List

not listed

     
  NatureServe

not listed

     
  Minnesota

not listed

     
           
           
           
 
Description
 
 

The eyes are green. The abdomen is pale gray with a black marking on the upper portion of each segment.

 
     
 

Size

 
 

Total Length: 1 to 1¼

 
     
 

Similar Species

 
     
     
 
Habitat
 
 

Prairies, disturbed areas.

 
     
 
Biology
 
 

Season

 
 

Mid-July to early September

 
     
 

Behavior

 
 

 

 
     
 

Life Cycle

 
 

 

 
     
 

Larval Food

 
 

 

 
     
 

Adult Food

 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

7, 24, 30.

 
  8/17/2019      
         
 

Occurrence

 
 

 

 
         
 
Taxonomy
 
 

Order

Diptera (gnats, mosquitoes, true flies)  
 

Suborder

Brachycera (circular-seamed flies, mouches muscoïdes, muscoid flies, short-horned flies)  
 

Infraorder

Muscomorpha  
 

Superfamily

Asiloidea  
 

Family

Asilidae (robber flies)  
 

Subfamily

Asilinae  
 

Tribe

Asilini  
  Subtribe    
 

Genus

Promachus (giant robber flies)  
       
 

 

 
       
 

Synonyms

 
 

Asilus vertebratus

 
       
 

Common Names

 
 

This species has no common name. The common name for the genus Promachus is giant robber flies, and is applied here for convenience.

 
       

 

 

 

 

 

 

 

 

 

 

 

 

       
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Dan W. Andree
       

I noticed what I believe to be a Green-eyed Robber Fly motioning it tail end in and out of this Coneflower. I believe it was depositing eggs in it. It would poke it in and out several times and I filmed it doing so.

  giant robber fly (vertebratus)   giant robber fly (vertebratus)
       
  giant robber fly (vertebratus)    
       
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  giant robber fly (vertebratus)    
       
       

 

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slideshow

       
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Other Videos
 
  Giant Robber Fly (Asilidae: Promachus vertebratus) Mating
Carl Barrentine
 
   
 
About

Uploaded on Aug 13, 2010

Photographed at the Turtle River State Park, North Dakota (11 August 2010). Thank you to Herschel Raney (@Bugguide.net) for identifying this specimen!

   
       

 

Camcorder

         
Visitor Sightings
   
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Dan W. Andree
8/11/2019

Location: Frenchman’s Bluff SNA, Norman Co. Mn.

I noticed what I believe to be a Green-eyed Robber Fly motioning it tail end in and out of this Coneflower. I believe it was depositing eggs in it. It would poke it in and out several times and I filmed it doing so.

giant robber fly (vertebratus)


Kyle, PLM
8/30/2017

Location: Pope County

Many many of these zipping around as we are harvesting stiff sunflower.  They are landing on the sunflower and either pollinating or laying eggs...not sure, but they sure like stiff sunflower. 


     
     
 
MinnesotaSeasons.com Sightings
         

 

 

Binoculars


Created 2/15/2012

Last Updated:

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