Westwood, J. O. 1840a. Synopsis of the genera of British insects. [Synopsis sheet G, pp. 81-96]. In: Westwood, J. O. 1840. An introduction to the modern classification of insects; founded on the natural habits and corresponding organisation of the different families. Volume 2. Part XV. London: Longman, Orme, Brown, Green and Longmans, pp. 353-400. [1840-01] 129814

Date from Griffin (1932) and Blackwelder (1949a). Ants p. 83.