ⓘ Dioctria hyalipennis
From England, introduced to Boston, Massachusetts area around 1916. Head: Upper head and top of head shiny black. Lower face has silvery-white pile. Mustache mystax white. Proboscis short, black.
Antenna: Appears Y-shaped, segments about equal in length. Black with short black hair.
Thorax: Obvious neck. Thorax raised or humped; black with two long indented lines and a faint covering of light yellow pile. Segment 2 scutellum small with a line of yellow pile at base. Thorax sides have a wide stripe of whitish pollen extending along thorax down to front leg.
Wings: Wings hyaline, but appear darker when folded over body. Veins brown. Halteres light yellow.
Legs: Front and middle legs mostly yellow with black streaks on top side, tips dark; feet black with gray pile and yellow spines and toes. Hind legs black; 1 st foot segment swollen.
Abdomen: Abdomen black, shining. Lower margin of segments have a thin whitish line. First 4 male segments very narrow and constricted appear wavy; last few segments gradually widen to tip. Female abdomen flat on top side, rounded and orange on underside; much wider and thicker than male, but shorter.
Size: 10 to 14 mm.
Habitat: Meadows, forest and field edges with large shrubs and Cedar trees.
Food: Adults feed on mostly small wasps and bees like Lasioglossum and Hylaeus. Also reported feeding on small flies Diptera and pygmy grasshoppers Tetrigidae.
Flight Time: May to July
Synonyms: Fabricius, 1794
Dioctria anomala, Dioctria flavipes, Dioctria frontalis, Dioctria varipes, Dioctria baumhaueri, Dioctria strandi
- Holotype as Dioctria flavipes by Meigen, 1804. Type Locality: Netherlands. Baumhauer’s collection is split between the Liege and the Leiden Museum, Netherlands.
- Holotype as Dioctria strandi by Duda, 1940. Type Locality: Unknown. Museum unknown.
- Holotype as Dioctria frontalis by Meigen, 1804. Type Locality: Unknown. Most of the Meigen collection is now in the Museum National dHistoire Naturelle in Paris, France.
- Holotype as Dioctria varipes by Meigen, 1820. Type Locality: Unknown. Most of the Meigen collection is now in the Museum National dHistoire Naturelle in Paris, France.
- Holotype as Dioctria anomala by Macquart, 1826. Type Locality: Unknown. Many Macquart types are in Bigot’s collection which is divided between the University Museum at Oxford and the British Museum of Natural History, London, England. Also, Macquart types are scattered among a number of museums, with his personal collection deposited in Lille.
- Holotype as Asilus hyalipennis by Fabricius, 1794. Type Locality: Denmark. Fabricius’ collection is in the University of Copenhagen Zoological Museum, Copenhagen, Denmark.
- Holotype as Dioctria baumhaueri by Meigen, 1820. Type Locality: Netherlands. Baumhauer’s collection is split between the Liege and the Leiden Museum, Netherlands.