204 Psyche [December 



anterior border. Mandibles very convex, with two large, incurved apical teeth. 

 Antennae very short and slender, the scapes curved, but scarcely flattened, less than 

 half as long as the scrobe; funicles longer than the scapes; all their joints longer 

 than broad. Thorax robust, especially in front, without humeral callosities; pro- 

 and mesonotum in profile forming a simple subangular convexity, without a con- 

 striction at the pro-mesonotal suture; mesoepinotal constriction well-developed; 

 epinotum small, its base and declivity sloping, not separated by an angle; spines 

 short, slender and rather blunt, longer than broad at their bases, directed upward 

 and slightly backward, less than half as long as the distance between their bases. 

 Petiole from above about 13^ times as long as broad, broadest behind, with con- 

 cave sides, its node rather high, strongly compressed anteroposteriorly, in profile 

 with concave anterior and posterior declivities and seen from behind with straight, 

 entire upper border. Postpetiole \}/2 times as broad as the petiole, convex above, 

 nearly twice as broad as long, with the sides projecting as blunt angles, which are 

 rounded in front and sUghtly concave behind. Gaster smaller than the head, ellip- 

 tical. Legs long and stout, with distinctly incrassated femora. 



Whole surface, especially that of the gaster, shining. Mandibles coarsely stria- 

 topunctate. Clypeus transversely rugulose-punctate. Head in front longitudi- 

 nally punctate, transversely and arcuately rugulose on the posterior two thirds 

 except the posterior corners which are rather densely reticulate-rugose. Gular 

 surface more shining, punctate. Thorax above, including the epinotal declivity, 

 transversely rugose, pleurae shining, more indistinctly rugose. Petiole and post- 

 petiole rather smooth, the latter coarsely punctate on the sides. Gaster and legs 

 glabrous, with small, indistinct, scattered piligerous punctures. 



Body, legs and scapes covered with very long, suberect, golden yellow hairs, 

 which are very abundant on the upper surface of the head and clypeus and sparser 

 elsewhere. The hairs on the upper surface of the head are directed backward, 

 those on the clypeus, mandibles and gula forward. 



Ferruginous red; legs slightly paler and more yellowish; gaster, borders of man- 

 dibles, clypeus, gula and antennal scrobes, black. 



Described from a single worker taken by Mr. Frederick Knab 

 at Almoloya, Oaxaca, Mexico (Nat. Mus. Coll. Type No. ). 

 Two workers taken by the same collector in the same locality may 

 belong to this species but they are so unlike the soldier that I 

 deem it best not to describe them. 



This extraordinary species is very distinct from all the species 

 of the genus known to me. In the possession of deep antennal 

 scrobes running obliquely downward to the sides of the head, it 

 resembles Ph. aberrans Mayr of South America and Ph. scrohifera 

 Emery of Costa Rica ; but the head in these species is much shorter 

 and of a very different shape, the scrobes are shallower and broader, 

 the pilosity and color are very different, and the latter species 

 measures only 2.75 mm. Ph. cavifrons Emery of Uruguay seems 



