1919] 



Wheeler — A Singular Neotropical Ant 



127 



Hairs and pubescence white, the hairs short and sparse, rather 

 uniformly distributed on the body, absent on the legs; pubescence 

 fine, dense and hiding the sculpture on the gaster, postpetiole, 

 petiole, epinotum and legs, so that these parts appear pruinose, 

 more dilute on the pronotum and especially on the head. 



Head and pronotum yellowish red; mandibles, antennse and 

 clypeus lemon yellow; remainder of body fuscous; meso- and epino- 

 tum and petiole suffused with reddish; apical margin of first 

 gastric segment and base and apex of succeeding segments, tarsi, 

 trochanters, tips of coxse, bases and tips of tibiae and femora brown- 

 ish yellow. Mandibular teeth and ocellar region blackish. 



Female. (Fig. 2.) Length 6.5-7 mm. 



Head nearly 2| times as long as broad, suboblong, with broadly 

 excised posterior border and straight, parallel sides, the eyes flat, 

 about J as long as the head, their posterior orbits slightly behind its 



Fig. 2. Pseudomyrma filiformis Fabr. Female, a, lateral view; b, head and 

 c, petiole, postpetiole and first gastric segment from above. 



median transverse diameter. Ocelli small, only slightly larger 

 than those of the worker. Mandibles and clypeus much as in the 

 worker. Frontal carinse very small and close together. Frontal 

 groove represented by a shallow pit in the center of the head and a 

 faint, impressed line running from it to the anterior ocellus. An- 

 tennse shorter than in the worker, the scape scarcely reaching to 

 the anterior orbit. Thorax very long and slender, nearly four times 

 as long as broad, narrower than the head, the sides almost sub- 



