“…We conducted a literature search by species for traits potentially important to explain the elevation distribution of our species (Bernard, 1968;Della Santa, 1994; http://www.antweb.org/, Cherix & Higashi, 1979;Dethier & Cherix, 1982;Verhaege et al ., 1984;Hölldobler & Wilson, 1990;De Biseau & Couvreur, 1994;Seppa, 1994Seppa, , 1996Gertsch et al ., 1995;Dettorre et al ., 1997;Cherix et al ., 2006;Aron et al ., 2009;Rees et al ., 2010;Table S2). We found that potentially relevant traits had been measured in all of the species found in our transect; these traits were: (i) the social structure of the nest (monogyny vs. polygyny), (ii) the mean size of the workers of the species, (iii) the type of nest; built from vegetal debris or dug in the soil (Cherix et al ., 2006), and (iv) whether the nymph develops with or without a cocoon.…”