Forel, A. 1904k. The psychical faculties of ants and some other insects. Annual Report of the Board of Regents of the Smithsonian Institution 1903:587-599.
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Forel, A. 1905b. Sklaverei, Symbiose und Schmarotzertum bei Ameisen. Mitteilungen der Schweizerischen Entomologischen Gesellschaft 11:85-90.
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Forel, A. 1908e. Lettre à la Société Entomologique de Belgique. Annales de la Société Entomologique de Belgique 52:180-181. PDF
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Forel, A. 1900c. Ébauche sur les moeurs des fourmis de l'Amérique du Nord. Rivista di Scienze Biologiche 2:180-192.

Notes: Translated in Psyche (Cambridge) 9:231-239, 243-245. See Forel (1901h, 1901i). This is Forel's letter and Appendix to the Société Entomologique de Belgique (Forel, 1899g).

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Forel, A. 1900e. Formicidae. Index. Biologia Centrali-Americana Hym. 3:161-169.
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Forel, A. 1901h. Sketch of the habits of North American ants. I. [Translated by A. P. Morse.]. Psyche (Cambridge) 9:231-239. PDF

Notes: English translation of Forel (1900c).

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Forel, A. 1901i. Sketch of the habits of North American ants. II. [Translated by A. P. Morse.]. Psyche (Cambridge) 9:243-245. PDF

Notes: English translation of Forel (1900c).

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Forel, A. 1903c. Faune myrmécologique des noyers dans le canton de Vaud. Bulletin de la Société Vaudoise des Sciences Naturelles 39:83-94. PDF
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Forel, A. 1903d. Recherches biologiques récentes de Miss Adèle Fielde sur les fourmis. Bulletin de la Société Vaudoise des Sciences Naturelles 39:95-99.
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Baum, H. 1903. Kunene-Sambesi-Expedition, 1903. Berlin: Verlag des Kolonial-Wirtschaftlichen Komitees, 593 pp.
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Forel, A. 1893g. Quelques fourmis de la faune méditerranéenne. Anales de la Sociedad Española de Historia Natural (Actas) (2)2[=22]:90-94. PDF

Notes: This is a translation of Forel (1892g), with corrected type locality information by M. Medina.

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Forel, A. 1894f. Polymorphisme et ergatomorphisme des fourmis. Archives des Sciences Physiques et Naturelles (3)32:373-380.
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