Catalogue of the hymenopterous insects in the collection of the British Museum. Part VI. Formicidae. Author Smith, F. text 1858 British Museum London http://antbase.org/ants/publications/8127/8127.pdf book 8127 C86CFDBF-61D9-48EE-9C2E-325FC0462B10 148. Formica arborea . B.M. Worker. Length 3 1/2- lines.-Opake-black: head large, wider than the thorax, slightly emarginate behind; the scape ferruginous at the base; the clypeus subcarinate, its anterior margin rounded; the mandibles armed with five acute teeth. Thorax oblong, slightly narrowed behind; the two apical joints of the tarsi ferruginous; the head and thorax thinly sprinkled with pale yellow hairs. Abdomen ovate, clothed with short glittering yellow hairs. Hab . Brazil. There are several specimens of this species in the Museum Collection: a label attached to one bears the inscription, " The Leaf Ant.-Island of Morajo, Brazil."