A recent study of the Australian ants collected some years ago by Mr. A. M. Lee and myself has led me to revise the Pone-.fine genera Myopias and Acanthoponera, two groups of more than usual interest on account of their singular geographical distribution. The former genus was established by Roger more than 60 years ago for a Ceylonese ant, M. amblyops, which has not been taken since, although considerable thorough collecting has been done in India and Ceylon. A second species was brought to light in New Guinea by L. Bir6 and described in 1901 by Emery as M. cribriceps. A third species has now been discovered by Mr. Lea in Tasmania and is described in the sequel. Psyche [Dece robe, ment. The American forms, moreover, may be readily separated into two groups, one of which, including A. mucronata Roger, the type of the genus, and goeldii Forel, have tridentate claws and long epinotal spines, while the other, including the remaining species, carinifrons Mayr, dentinodis Mayr and dolo Roger, have, like the Australian forms, simple claws and a merely dentate epinotum. In my opinion, the latter group should be regarded as a distinct subgenus, for which I suggest the name Anacanthoponera subgen, nov., with Ponera dolo Roger as the type. Few groups of ants resemble Aeanthoponera in having an "antarctic" distribution. Perhaps the best example is the subgenus Notomyrmex of the genus Monomorium, which is represented by a number of species in Australia, New Caledonia, Lord Howe Island, Norfolk Island, New Zealand, a few in Patagonia and Chile and, according to Emery, also a few in Madagascar and East Africa. Mann's subgenus Fulakora, a group of species of the archaic genus Stigmatomma, with approximated frontM earinm, may also be eitbd, in this connection because it is represented in the
