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."

Published as part of Smith, F., 1858, Catalogue of the hymenopterous insects in the collection of the British Museum. Part VI. Formicidae., London :British Museum on pages 44-45