1921] Wheeler: Tackigalia Ants 143 



more opaque, more brownish, with longer head and antennae, 

 larger eyes, more slender thorax, much more angular epinotum 

 and feebler pilosity. The var. endophyta Forel resembles davi- 

 nosa in coloration, but the description is very brief. In arboris- 

 sanctse the body and eyes are larger, the antennae decidedly 

 longer, the petiolar node more strongly truncated behind, with 

 submarginate sides, the postpetiole is smaller and narrower, the 

 color uniformly brownish yellow. Ps. danmosa is also closely 

 related to dendroica Forel, but this form is larger, with a differ- 

 ent sculpture and color, a different petiole, etc. Stitz's Ps. picta, 

 too, is an allied form but, to judge from his figure, has very 

 large eyes and a very different thorax, petiole and postpetiole. 

 It is certain, nevertheless, that all the forms mentioned — 

 damnosa, latinoda, arboris-sanctas, dendroica and picta — as well 

 as triplaridis Forel and the species maligna, described below, 

 constitute a peculiar group of very closely related tachis confined 

 to living myrmecophytes. One might regard the whole complex 

 as a single highly variable species, but in the present state of 

 our knowledge it is advisable not to indulge in too much "lump- 

 ing" in the genus Pseudomyrma. 



5. — Pseudomyrma maligna sp. nov. 

 (Fig. 14 a-c) 



Worker. Length : 4-4.6 mm. 



Very similar to the preceding species but slightly smaller, 

 head somewhat broader and shorter, eyes distinctly smaller, less 

 elongate and more flattened ; ocelli smaller and further apart ; 

 mandibles more flattened with less curved external borders, 

 frontal carinse less approximated, antennal scapes shorter and 

 more incrassated towards their tips. Clypeus sharply carinate, 

 depressed on the sides, its anterior border emarginate laterally, 

 produced in the middle as a short, transverse lobe, with feebly 

 concave margin and sharp corners. Thorax shorter and more 

 robust than in danfinosa; pronotum broader, more convex on 

 the sides and above; r lesoepinotal impression shorter but quite 

 as deep ; epinotum decidedly shorter, the base from above sub- 

 hexagonal, broader behind than in front, and almost marginate 

 on the sides, more flattened, appearing straight in profile, the 

 declivity of the same length and forming with the base a more 



