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Types Mus. Comp. Zool. Harvard.
diagnosis A member of the " jujuyensisHNS complex" of the larger fallaxHNS group, comprising araneoidesHNS, cuevasiHNS, durioneiHNS, jujuyensisHNS, kugleriHNS, leoninaHNS, leptinaHNS, lucretiiHNS, lupusHNS, paraensisHNS, punctithoraxHNS, tijucanaHNS, wallaceiHNS, and wolfringiHNS, which complex is characterized in both major and minor by slender body form and exceptionally long antennal scapes and petiolar pedicel; also in the major by a proportionately small head; and in the minor by a strongly developed nuchal collar. P. leptinaHNS is distinguished as follows. Major: antennal scape exceeding the occipital corner by more than 2X its own maximum width; head unusually small and occiput narrowed in frontal view; posterior half of head capsule and all of gaster smooth and shiny; propodeal spines reduced to denticles. Minor: occipital neck only moderately developed; propodeal spines reduced to denticles. Both castes: body brown, appendages dark yellow.
Measurements (mm) Holotype major: HW 0.84, HL 0.94, SL 0.84, EL 0.22, PW 0.50.
Paratype minor: HW 0.52, HL 0.72, SL 0.98, EL 0.18, PW 0.40.
Color Major: body uniformly medium brown, appendages brownish yellow.
Minor: gaster light brown, rest of body medium brown, appendages dark yellow.
Range Known only from the type locality.
Figure Upper: holotype, major. Lower: paratype, minor. PERU: Cocha Cashu Research Station, Madre de Dios, 400 m (Diane W. Davidson). Scale bars = 1 mm.
Elevations: collected at 400 m