Sp. 6. Eciton smillima, n. s.

Worker. - Length 2 lines. Reddish yellow; the antennae short and clavate; head elongate, emarginate behind, the lateral angles acute: the metathorax having two longitudinal carinae, not produced at their apex; legs shorter than in any of the other species, except E. crcissicornis, the first node of the abdomen having a minute acute spine beneath, at its base; the second also having a very minute tooth, or spine, directed forwards: the entire insect very thinly sprinkled with pale glittering hairs.

This species approaches nearest to E. crassicornis; but its flagellum is much more slender at the base, the head is more elongate, and the metathorax differently formed. Sent from Para, by Mr. H. W. Bates.