Sp. 8. Pseudomyrma oculata . (PI. XIII.)

Female.-Length lines. The head, antennae, prothorax, tibise and tarsi, pale rufo-testaceous; the head elongate, full twothirds of the length of the thorax; it is also wider than the latter; the eyes very large, placed rather more within the face than in the other species; the antennae rather more thickened at the apex than in the other species of the genus; the meso- and metathorax, abdomen and femora, fusco-testaceous; wings hyaline, nervures pale testaceous, the stigma fuscous; the sides of the thorax nearly parallel, transverse in front, the angles rounded; the metathorax obliquely rounded at the sides,

Worker.-2 lines. Closely resembling the female, but having the thorax strangulated in the middle, and compressed at the sides, and being altogether of a paler colour.

There is considerable difference in the form of the thorax and head of this species when compared with the others; and had I not possessed the female, and had an opportunity of observing that the neuration of the wings is identical with that of the others, I should probably have placed this insect in a separate genus. In addition to these reasons for retaining it, I have the observation of Mr. Bates on its habits, that of coursing over trunks of trees and leaves, in the same manner as the other species; and his note of observation-"this curious Myrmica is closely allied to No. 70," P. nigriceps .

Also from Brazil, in my own and other Collections.