Head: Black with sparse pale hair. Lower face (clypeus) yellowish. Wide yellow band almost completely surrounds eye margin. Cheeks almost as wide as eye width. Mandibles without teeth.
Antenna: Base (scape) reddish-brown, underside brownish-yellow. Segments dark; reddish-brown on underside.
Thorax: Black, with a thin yellow line on edge above wing base. Collar bright yellow. Segment 2 (scutellum) has two large bright yellow knobs and a yellow line below. Segment 3 (propodeum) has large yellow side patches. Thorax sides have a very large yellow patch below 1 or 2 small spots. Tubercles (pronotal lobes) bright yellow. Underside of thorax dark.
Wings: Wing knobs (tegula) bright yellow. Wings tinted reddish, tips slightly darker. Veins reddish yellow.
Legs: Thighs (femora) largely reddish with wide yellow tips; may have black streaks. Shins (tibiae) yellow with reddish-brown streaks. Feet light brown.
Abdomen: Reddish-brown with wide, bright yellow stripes; all except first stripe entire across segments. Segment 2 has the widest stripe. Abdomen tip wide, square. Underside of 2 to 6 are yellow, margins reddish. Underside of segment 5 has a dense tuft of long, curved, brownish hairs which meet at center, and segment also covered with silvery hair.
Head: Black with short, pale yellowish hair over entire head. Lower face (clypeus) yellow. Eye margins have yellow border almost complete. Cheeks narrower than eye width. Mandibles quite slender, no teeth.
Antenna: Base (scape) dark on top side, bright yellow and enlarged on underside. Segments dark on top side, brownish-yellow on underside. Segment 1 shorter than 2. Rest slightly longer than wide. Segment 3 without spines, but 7 to 10 with spines (denticles).
Thorax: Black with short, pale yellowish hair. Segment 1 (scutum) without marks. Segment 2 (scutellum) has two very small yellow knobs, may be absent. Segment 3 (propodeum) has each side fringed with light hair. Thorax sides have bright yellow tubercle (pronotal lobe) with a mark below. Underside densely covered with light hair.
Wings: Wing knobs (tegulae) bright yellow. Wings slightly tinted, tips darker. Veins brownish.
Legs: Thighs (femora) black with wide yellow tips; underside fringed with dense white hair. Shins (tibiae) bright yellow with faint brownish-red patches. Feet yellow, hind foot 1st segment brown, rest orange-brown.
Abdomen: Black with bright yellow stripes all entire across segments, except the first. Segment 2 widest. Segment 3 and 4 stripes are narrower than the dark area below the stripe. Underside of abdomen mostly yellow. Tip as wide as long, notched with dense erect hair.
Similar Species: N. imbricata has wide reddish lower margins on abdomen.
Size: Female 9.5 to 12 mm Male 8.5 to 11.5 mm
Habitat: Forest edges.
Food: Wild Strawberry and other spring flowers. Larvae feed on food stored by Mining Bees Andrena.
Flight Time: April to June
Life Cycle: Females steal into Mining Bee Andrena nests to lay their eggs.
Comments: Essex County – photos. Peel County – per photos. Also in Southern Michigan – Livingston County.
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