Both male and female:
Head: Black with a few short, white hairs. Eyes bordered with reddish-brown line. Mandibles dark, toothless.
Top of mouth area (clypeus) has thin red line. Cheeks slightly narrower than eye width. Male has yellowish hair on lower face.
Antenna: Base (scape), pedicel and 1st segment more yellowish-brow, but not red. Rest of antenna dark brown. Underside brownish-yellow. Male has underside of base yellow.
Thorax: Dark brown with some reddish-brown streaks. Segment 2 (scutellum) raised knobs may be slightly reddish. Bottom end of thorax has tiny yellowish to whitish mark at each side; dense white hair on male. Thorax side have a few short, white hairs, more so on male.
Wings: Wing knobs (tegulae) shiny, reddish brown. Wings darkly tinted, light spot near tips. Veins dark. Male wings have lighter tint.
Legs: Female legs reddish brown; dark streaks on thighs (femora). Male legs brownish-yellow with darker streaks; tips lighter.
Abdomen: Segments dark with bright yellow marks. Stripes on 3 to 5 about the same width.
Segment 1: Very narrow, wavy line, slightly interrupted at center.
Segment 2: Very wide stripe, notched at top, very slightly interrupted at center.
Segment 3: Narrow stripe, widely interrupted at center.
Segment 4: Narrow stripe, notched on lower border, barely interrupted at center.
Segment 5: Narrow stripe, notched on lower border, continuous.
Segment 6: Male only – same as segment 5.
Female tip squarish with tuft of dark hair; male tip wide, notched.
Underside of segments 2 to 4 with some yellow marks.
Similar Species: Females of Nomada banksi have an entirely red scape and base antenna segments, and while the scutellum also has red, it is more deeply grooved than in Nomada vicina.
Males of Nomada banksi have the clypeus is entirely bright yellow, and the scutellum either is entirely black or has a pair of small yellow spots. The marks on abdomen are superficially similar in the two, although minor differences are evident.
Size: Female 9 mm. Male 7 to 10 mm.
Habitat: Sandy meadows, forest edges.
Flight Time: August to September.
Life Cycle: Parasite of Mining Bees Andrena vicina per Hurd, 1979 and Andrena hirticincta.
Comments: Essex County – Ojibway Prairies species list, 2008. Kent County – Komoka Feed Mill. Peel and Durham Counties. Also in southern Michigan (Livingston County).
For information on synonyms, references and type specimens see next page