122. Formica detecta ^HNS. B.M.

Female. Length 6 lines.-Nigro-fuscous: the antennae and legs ferruginous. Head fusco-ferruginous; the sides, beneath, the face anteriorly and the mandibles ferruginous; rather wider than the thorax, and emarginate behind, with an impressed line running from the anterior stemma to the base of the clypeus. Thorax ovate, thinly covered on the disk with short reddishbrown pubescence; wings subhyaline, yellowish along the anterior margin of the superior pair and towards their base; the nervures rufo-fuscous. Abdomen ovate, the apical margins of the segments rufo-piceous; covered with a fine grey silky pile; the scale of the peduncle subovate, compressed, with the margin entire.

Hab. Australia (Hunter River).