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Types Mus. Comp. Zool. Harvard.
diagnosis A medium-sized member of the tristisHNS group, similar to amataHNS, celaenaHNS, feraHNS, germainiHNS, peruvianaHNS, rutilanaHNS, schwarzmaieriHNS, vomerHNS, and possibly the same as bruchiHNS of Argentina, on the basis of resemblance of the minor (major syntypes of bruchiHNS could not be located in the Forel collection at the time of study). The paratype minor of ambiguaHNS differs from a syntype minor of bruchiHNS in its more abundant pilosity, lighter color, and foveolate promesonotal dorsum. Otherwise, ambiguaHNS is distinguished within the tristisHNS group by the following combination of traits.
Major: anterior two-thirds of dorsum of head carinulate, remainder smooth and shiny; carinulae on rest of body limited to anterior strip of pronotal dorsum; humerus in dorsal-oblique view moderately prominent and lobose; postpetiole from above diamond-shaped. Minor: pilosity sparse; propodeal spines reduced to denticles; promesonotal profile in dorsal-oblique view smoothly convex; occiput narrowed, with a nuchal collar.
Measurements (mm) Holotype major: HW 1.54, HL 1.74, SL 0.78, EL 0.18, PW 0.72.
Paratype minor: HW 0.56, HL 0.62, SL 0.74, EL 0.40, PW 0.36.
color Major: light reddish yellow.
Minor: body light yellowish brown, appendages yellow.
range Known only from the type locality.
figure Upper: holotype, major. Lower: paratype, minor. BRAZIL: Caraguatatuba Reserva Florestal, Sao Paulo (William L. and Doris E. Brown). Scale bars = 1 mm.