shaved horse fly

(Stonemyia rasa)

Conservation Status
shaved horse fly
Photo by Luciearl
  IUCN Red List

not listed

     
  NatureServe

N5 - Secure

     
  Minnesota

not listed

     
           
           
           
           
 
Description
 
 

Shaved horse fly is a small horse fly. It occurs on the northern United States from Maine to Minnesota, south to Illinois and North Carolina, and in Ontario. It is uncommon in Minnesota, where it is at the western extent of its range.

Adults are stout-bodied and 7 16 to ½ (11 to 13 mm) in length.

There are two large compound eyes on the side of the head and three simple eyes (ocelli) in a triangle at the top of the head (vertex). On the male the compound eyes meet at the top of the head. On the female they do not. The inner upper corner of the compound eye on the female forms a right angle. The antennae have three segments, the scape, the pedicel, and the flagellum. The scape is only slightly longer than wide, the pedicel is much shorter than wide, and the flagellum has many ring-like segments (annulated).

The abdomen is black. The sides are sometimes pale but are never orange. The rear margin of each segment has a fringe of grayish hairs that sometimes expands into a triangle in the middle. The first segment is deeply notched at the middle of the hind margin.

The wing is clear and faintly tinted. It does not have dark markings and is not darkened at the base or at the tip. The cell at the leading edge (costal cell) is clear. At the base of each wing there are two small, rounded lobes (calypters) that cover the halteres. The calypters are large and unequal in size.

The legs are reddish-brown to dark brown. The fourth segment (tibia) of the hind legs have large spurs at the tip. The last part of the foot (tarsus), corresponding to the foot, has three pads.

 
     
 

Size

 
 

Total Length: 7 16 to ½ (11 to 13 mm)

 
     
 

Similar Species

 
     
     
 
Habitat
 
 

 

 
     
 
Biology
 
 

Season

 
 

Late July to September

 
     
 

Behavior

 
 

 

 
     
 

Life Cycle

 
 

 

 
     
 

Larva Food

 
 

 

 
     
 

Adult Food

 
 

Females feed on mammalian blood. Males feed on flower nectar.

 
     
 
Distribution
 
 

Distribution Map

 

Sources

24, 27, 29, 30, 82.
 
  1/25/2021      
         
 

Occurrence

 
 

 

 
         
 
Taxonomy
 
 

Order

Diptera (gnats, mosquitoes, true flies)  
 

Suborder

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

Infraorder

Tabanomorpha  
 

Superfamily

Tabanoidea  
 

Family

Tabanidae (horseflies and deerflies)  
 

Subfamily

Pangoniinae  
 

Tribe

Pangoniini  
 

Genus

Stonemyia  
       
 

Synonyms

 
 

Pangonia rasa

 
       
 

Common Names

 
 

shaved horse fly

 
       

 

 

 

 

 

 

Glossary

Calypter

On flies: one of two small membranous lobes at the base of the forewing that covers the haltere. On mosses: A thin cap that covers and protects the capsule and operculum and drops off at maturity.

 

Costa

On plants: The central axis of a pinna, to which pinnules are attached. On insects: The vein on the leading edge of the forewing.

 

Ocellus

Simple eye; an eye with a single lens. Plural: ocelli.

 

Scape

On plants: An erect, leafless stalk growing from the rootstock and supporting a flower or a flower cluster. On insects: The basal segment of the antenna.

 

Tarsus

The last two to five subdivisions of an insect’s leg, attached to the tibia; the foot. Plural: tarsi.

 

Tibia

The fourth segment of an insect leg, after the femur and before the tarsus (foot). The fifth segment of a spider leg or palp.

 

 

 

 

 

 
 
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Alfredo Colon

 
    shaved horse fly      
 

Luciearl

 
    shaved horse fly      
           
 
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  Alfredo Colon
August 2019

Location: Slinger, Wisconsin

shaved horse fly  
  Luciearl
8/25/2019

Location: Cass County

shaved horse fly  
           
 
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Created: 9/5/2019

Last Updated:

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