Identification: Only the male is described in entomology journals
Head: Light reddish-brown with pale to whitish hair. No yellow marks, except faint yellowish stripe at back of eye, reaching only to mid eye. Mandibles without teeth. Black patch between and above antenna and around simple eyes (ocelli).
Antenna: Base (scape) and antenna reddish-brown.
Thorax: Light reddish-brown. Collar thin, yellow, may have slight break at center. Segment 1 (scutum) has faint black median stripe, indented. Segment 2 (scutellum) raised, bright yellow. Segment 3 (propodeum) dark with a pair of large yellow, longitudinal patches and white fringe on each side edge. Thorax sides entirely light reddish-brown sprinkled with short, whitish hair. Tubercle (pronotal lobe) bright yellow.
Wings: Wing knobs (tegulae) reddish-brown. Wings tinted brownish, clear spot just before wing tip. Thin line along costal border and small stigma darker reddish-brown.
Legs: Reddish, faintly lighter at tips of segments. Mid and hind coxae have silvery-white hair. Shins (tibiae) covered with short white pile. Feet slight darker. Hind shin tip has white hairs on underside.
Abdomen: Light reddish-brown with bright yellow stripes.
Segment 1 base dark; stripe indented and interrupted at center.
Segment 2 large stripe, indented at center.
Segments 3 to 5 stripes narrower and entire across segments.
Tip yellow, bi-lobed similar to male but shorter and wider.
Head: Dark brown to black with long, thick silvery hair. Lower face (clypeus) yellow, yellow continuing up inner eye margin past antenna bases. Cheeks as wide as eye width. Mandibles thin, toothless, yellow with reddish tips.
Antenna: Base (scape) slightly swollen, reddish on top side and yellow on underside. Segments reddish, slightly darker on basal segments. Underside of segments brownish-yellow. Segment 1 very short.
Thorax: Dark brown to black, with long, pale hair. Light yellow collar stripe very short and thin, hardly visible. Segment 1 (scutum) dark brown to black; no other marks. Segment 2 (scutellum) has two raised yellow spots, surrounded with faint reddish-brown. Segment 3 (propodeum) black, sparsely covered with white hairs, more dense along each side edge. Thorax sides slightly darker than top; under wing base a tiny rusty reddish-yellow mark. Tubercles (pronotal lobes) pale yellow. Lower thorax covered with thick white hair. Underside has thick dense whitish hair, obscuring surface.
Wings: Wing knobs (tegulae) yellowish-brown. Wings darkly tinted, base and spot before wing tips clear. 2nd submarginal cell wider than 3rd on top edge. Veins brownish.
Legs: Thighs (femora) dark reddish-brown, tips lighter; underside black. Hind thigh slender. Shins reddish-yellow, tips lighter. Front and middle feet (tarsi) yellow. Hind foot darker.
Abdomen: Reddish-brown, all segments with yellow stripes very slightly interrupted at center by a red line.
Segment 1 base is black, in middle is a narrow, rippled stripe.
Segments 2 to 4 mostly yellow. Segment 2 stripe very large and may be notched along lower border.
Segment 5 stripe notched and narrowed along lower margin, barely reaches side of segment edge.
Segment 6 stripe is short, more at center of segment than sides.
Underside of abdomen is very dark reddish-brown, very fine pale hairs and tip deeply notched, narrow, yellowish and very hairy.
Size: Female 9 to 11 mm long. Male 8 to 10 mm long.
Habitat: Forests where there are Andrena Mining bees.
Food: Adults eat nectar. Larvae are parasites on Mining Bees Andrena
Flight Time: May to August.
Life Cycle: Parasitic on Mining Bee Andrena vicina, and possibly Metallic Green Bees Agapostemon.
Comments: Essex County (my photos). Ontario – Williamsburg (near Cornwall) per Barcode of life data systems (BOLD). Also in Michigan – Livingston County.
For information on synonyms, references and type specimens see next page