Brachyrhinchus (sic!) angustellus BLANCHARD, 1852: 205 (original description)

Aradus angustellus: SIGNORET 1863: 576 (taxonomy)

Aradus angustellus: KORMILEV & FROESCHNER 1987: 36 (catalog)

Aradus angustellus: HEISS 1993: 121 (figures head, pronotum 3, ♀, pygophore)

Aradus angustellus: COSCARON & CONTRERAS 2012: 14 (catalog, bibliography)

Aradus angustellus: CONTRERAS & COSCARON 2012: 8 (distribution, fig. F)

M a t e r i a l e x a m i n e d (CEHI): 1♀ Chile S.Amer. / El Canelo / 890 mtrs. Prov. / Santiago X.20.1951 / Luis E. Peña //; 1♀ El Canelo / Santiago / Chile XI. (? illegible) // Dr. Gutierrez / leg // (reverse side); 13 Chile / Coll. Signoret // (pygophore mounted separately)

13 Chile / E. Peuno / 15-II-51 / J. Herrera G. //; 13 02 / II / 2001 / Estaquilla / Chili (region X) // S 41.43941°/ W 73.69685° / Alt. 125m GPS 97 // Foret turbière sous / écorce arbre calcine / J-C Streito //

Aradus angustellus is characterized by the unicolored blackish antennae, shared only by the neotropical species Aradus compressicornis STÅL, 1873 and Aradus gracilis STÅL, 1873. However, the latter is distinguished by long slender antennae (shorter and cylindrical in A. angustellus, cf. figs 6, 7, 9, 10 HEISS 1973) and A. compressicornis by the spindle-shaped antennal segment II (cylindrical in A. angustellus) and different shape of paramers and tergite IX of the male (cf. figs 14, 15 HEISS 1973).

Distribution: Chile: Cordilleras de Ovalle (type locality), further literature citations without localities; Argentina: (Prov. Buenos Aires, Santa Cruz, Chubut, Rio Negro, Córdoba, Patagonia; Colombia (cf. BERG 1892 as Nova Grenada = ancient name for Colombia); Peru: Cuzco.