Gastrisus newtonorum, new species, is described based on specimens fro
m the states of Mexico, Guerrero, Jalisco and Morelos. One specimen wa
s examined by Bernhauer, however it was misidentified as G. mimetes Sh
arp. The Mexican record of G. mimetes in Bernhauer and Schubert's and
Blackwelder's catalogs was probably based on this misidentification. T
he two species are compared, and the aedeagi are illustrated. Distribu
tional and biological data are provided.