Head: Reddish-brown, slightly hairy. Dark spot on top of head and around antenna bases. Mandibles toothed.
Antenna: Entirely reddish-brown.
Thorax: Reddish-brown with some pale hairs. Segment 1 has median black line. Segment 2 (scutellum) slightly indented along centre. Segment 3 (propodeum) has some black and pale hairs on sides. Thorax sides have black near lower edge, sides covered with dense silvery-white hair.
Tubercle (pronotal lobe) barely visible.
Wings: Wing knobs (tegulae) dark reddish-yellow. Wings slightly tinged, tips darker. Veins dark, stigma reddish.
Legs: Entirely reddish-brown; except coxae and underside of thighs (femora) darker.
Abdomen: Reddish-brown, shiny with yellow spots.
Segment 1 base black, no yellow spots.
Segment 2 medium-sized, round yellow spot on each side.
Segments 3 & 4 faint spots or none.
Segment 5 two yellow spots close together at centre – distinct.
Underside entirely reddish-brown.
Similar species: Females of N. ovata are more red.
Head: Black, with dense pale hairs, more yellowish on top of head. Lower face (clypeus) yellowish with dark border and silvery hair. Inner eye margin narrow, yellowish-white extends from mouth to antenna bases. Cheeks about same width as eye width, hairy on lower half. Mandibles yellow with dark tips, toothed.
Antenna: Base (scape) entirely black. Segments dark reddish-brown with light tips; underside lighter. Segment 1 shorter than 2.
Thorax: Black, white erect long hairs. No yellow collar. Segment 2 (scutellum) entirely dark, dent in centre barely visible. Segment 3 (propodeum) black, white hairs on sides. Thorax sides densely hairy; tubercle brown, barely visible.
Wings: Wing knobs (tegulae) deep reddish-brown. Wings hyaline, tips dark. Veins brownish-yellow.
Legs: Orangish-brown with dense white hairs on underside of thighs (femora), tips lighter orange. Hind leg darker. Shins (tibiae) with some dark streaks. Feet (tarsi) a darker reddish-brown.
Abdomen: Dark brown with wide yellow stripes or spots all interrupted at centre, except segment 6.
Segment 1 base dark with light yellowish spots vague at side edges, or missing.
Segment 2 has widest spots, usually with notch in upper margin-side corner, and slightly wavy along lower margin.
Segment 3 slightly narrow stripe.
Segments 4 and 5 have narrower stripes with lower margin of stripes having U-shaped, inset indents, which sometimes can break the stripe so that it appears as spots.
Segment 6 stripe continuous across segment.
Abdomen tip narrow, bi-lobed, with long hairs forming a point.
Underside is darker, sometimes with spot on each side of segment 3 and at tip.
Similar Species: N. maculata male has two-tone antenna on top side, abdomen is red, not black, and flies later in April.
Size: Male 5.5 to 8.5 mm.
Habitat: Forest edges and meadows.
Food: Pollen and nectar from flowers.
Flight Time: Early spring.
Life Cycle: Parasite on Mining Bee Andrena species; Andrena imitatrix is listed as a host, but does not fly in Ontario.
Comments: Essex County – per photos, not on any list. Also Peel County.
For information on synonyms, references and type specimens see next page