The genus Necaxacris Roberts, 1939 (Acrididae: Melanoplinae) is endemic to Mexico. Two species were previously known for this genus: N. micans (Hebard, 1932) and a species collected by Roberts in 1936, mentioned in litteris by Descamps(1975) as N. moctezumae Roberts, 1975, but never formally described. We here describe and assign the name of N. tamazunchale n. sp. for this taxon and describe three additional new species: N. azura n. sp., N. afurculae n. sp. and N. davidi n. sp. A revision, description and illustration of diagnostic characters to identify the species that make up the genus are provided for the first time. Information on distribution and habitat of the species treated is also provided herein.