Akodon spegazzinii is found in northwestern Argentina, in the provinces of Salta, Catamarca, Tucumán, La Rioja, and Mendoza, at altitudes of . Although its main distribution is in the northern provinces of Salta, Tucumán, and Catamarca, there are also scattered records from the more southern provinces of La Rioja and Mendoza, where it is likely restricted to patches of wet habitat. "Akodon alterus" has been reported from Jujuy, but this record was likely based on misidentified specimens of "A. boliviensis", and records of "Akodon spegazzinii" from Jujuy were based on misidentified "A. sylvanus". "Akodon spegazzinii" is known from a paleontological site in
Formosa (horse) to Lambton, Cocoa Nut and Lopez. In her first start of the year in May, Formosa was second in the two-mile and two-furlong Tradesman's Plate run at Chester, losing to the mare Our Mary Ann. In June at Ascot, Formosa was beaten by Siderolite in the running for the two-mile Gold Vase. At the July meeting at Newmarket, Formosa was beaten by ten lengths by the 5-year-old mare Mysotia in the running for the £105 Queen's Plate. "The Sporting Review" commented on Formosa's poor form during the season, "[she] is being hacked about all over the country and losing her