18 WHEELER — ANTS FROM BORNEO AND LUZON [PGES 
Surface smooth and shining; mandibles covered with coarse, elongate 
punctures; median portion of clypeus, cheeks and front longitudinally 
striated. Thorax very delicately, gaster a little more coarsely, shagreened 
and covered with minute, scattered punctures. 
Hairs yellowish, very short, almost lacking on the body, except on the 
venter; abundant, stiff and blunt on the mandibles, clypeus and cheeks; 
tibize with minute, dilute appressed hairs or pubescence. 
Yellow; mandibles, a round spot on the ocellar region, a transverse, 
crescentic blotch occupying the dise of the pronotum, and each of the 
gastric segments, except its basal and apical border, castaneous. Wings 
uniformly tinged with brownish yellow, with clear, brown veins and aptero- 
stigma. 
Described from a single specimen taken by Prof. C. F. Baker on Mt. 
Makiling, Luzon Island, Philippines. 
The three previously known species of Dimorphomyrmez, viz. 
D. theryi Emery and mayri Wheeler of the Baltic Amber and 
D. janeti Ern. André of Borneo, are known only from worker speci- 
mens. These have 8-jointed antenne. Although the female 
above described has 10-jointed antenne, I believe that it must 
belong to the same genus. We should, in fact, expect the worker 
and female of Dimorphomyrmez to differ in the number of antennal 
joints, especially as André found nine joints in one of his specimens 
of D. janeti. It is even possible that D. luzonensis may be the 
female of André’s species. The shape of the body and the peculiar 
sculpture and pilosity of the anterior portion of the head in this 
phase, so like the conditions in certain species of Colobopsis and 
Aphomomyrmex, indicate very clearly that the colonies of Dimor- 
phomyrmex are small and inhabit hollow twigs. Collectors in 
Borneo and the Philippines should make diligent search in these 
objects for the missing phases of the two surviving species of this 
singular archaic genus. 
