Solenopsis nigella st. prevalens Santschi, 1923c: 257 (s.w.) ARGENTINA (Buenos Aires). Neotropic.

Primary type information: Primary type material: 4 syntype workers. Primary type locality: Argentina: La Plata (C. Bruch). Primary type depository: NHMB. Type notes: 1) Santschi indicates "La Plata" as the type locality, and informs a number not stated of workers from "Buenos-Ayres, Sierra Ventana". MZSP houses 2 W from Sierra Ventana labeled as cotype. Additionally, the Borgmeier's handwritten catalog (#3824) indicates these specimens are "Type" received from Santschi. 2) Pacheco & Mackay, 2013: 159, record 5 “cotype” (= syntype) workers from Argentina: Alta Gracia, in MCZC, but this locality is not mentioned in the original description.