Aenictus pachycerus valid India. Indomalaya.
Smith, F. 1858a. Catalogue of hymenopterous insects in the collection of the British Museum. Part VI. Formicidae. London: British Museum, 216 pp.   128685

Aenictus pachycerus continuus synonym of Aenictus pachycerus Sri Lanka. Indomalaya.
Forel, A. 1901a. Les Formicides de l'Empire des Indes et de Ceylan. Part VIII. Journal of the Bombay Natural History Society 13:462-477.   125105

Aenictus pachycerus impressus synonym of Aenictus aratus Australia (Queensland). Australasia.
Karavaiev, V. 1927f. Ameisen aus dem Indo-Australischen Gebiet. III. Zbirnyk Prats' Zoolohichnoho Muzeyu 3:3-52 [= Trudy. Ukrains'ka Akademiya Nauk. Fizichno-Matematichnoho Viddilu 7:3-52].   126257