An annotated list of Orthoptera species collected in carrion traps in a Quercus forest was compiled. Marcelonemobius mutum n. gen. et n. sp. (Trigonidiidae; Nemobiinae) is described. Four sites were chosen in an altitudinal gradient: 2,100, 2,300, 2,500 and 2,700 m. and monthly captures between September 2013 to August 2014. At each site, three carrion traps were placed separated by 100 m. A data logger situated at each altitude recorded temperature and humidity data. 175 individuals were registered belonging to seven families, 13 genera, and 15 species.