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Types Mus. Hist. Nat. Geneve; Mus. Comp. Zool. Harvard.
Etymology Named after the collector, Fr. Ris.
diagnosis Similar in various traits to aperHNS, bambusarumHNS, breviconaHNS, dyctiotaHNS, laeviventrisHNS, lutziHNS, rugatulaHNS, senilisHNS, sigillataHNS, trachydermaHNS, and trainiHNS, differing as follows.
Major: shallow antennal scrobes; pilosity along dorsal profile of head dense, with uniform short hairs about as long as Eye Length along the posterior half and much longer hairs along the anterior half; occipital cleft deep; occipital lobes smooth and subangulate; pronotum sparsely carinulate, mostly smooth; propodeal spine very stout, equilaterally triangular; postpetiolar node very broad, 2X broader than petiolar node, and spinose.
Minor: occiput, humeri, and propodeal dorsum rugoreticulate; almost all of head and mesosoma foveolate; occiput broad, concave, and lacking nuchal collar.
Measurements (mm) Syntype major: HW 0.96, HL 1.02, SL 0.44, EL 0.12, PW 0.54. Syntype minor: HW 0.66, HL 0.66, SL 0.62, EL 0.12, PW 0.44. color Major: body reddish yellow except for gaster, which is yellowish brown. Minor: concolorous dark yellow.
Figure Upper: syntype, major. Lower: syntype, minor. ARGENTINA: Buenos Aires (Fr. Ris). Scale bars = 1 mm.