206 Psyche [December 



XXIV, 1908, p. 141). This latter species, however, is larger, its 

 head and thorax are not glabrous but rugulose, its epinotal spines 

 are somewhat shorter and stouter, and the erect, obtuse hairs on 

 the body are much longer and more abundant. 



Apterostigma calverti sp. no v. 



Worker. Length 3.5-4 mm. 



Head, excluding the mandibles about 13^2 times as long as broad, with rather 

 straight, parallel sides and broadly rounded, convex posterior portion, suddenly 

 contracted into a short neck without a reflected posterior edge. Vertex with a 

 feeble longitudinal impression in the middle. Eyes convex, at the middle of the 

 sides of the head. Clypeus about twice as long as broad, with broadly rounded, 

 entire anterior border. Mandibles with 7-9 teeth, the two apical ones largest. 

 Frontal carinse in front with large, thick lobes, behind continued as diverging ridges 

 which are shorter than the lobes. Antennae robust; scapes surpassing the posterior 

 border of the head by about 3-1 their length, first funicular joint as long as joints 2-4 

 together; joints 2-9 not longer than broad. Thorax rather stout; pronotum with 

 prominent, reflexed cervical border, behind with a transverse convexity which is 

 continued down onto the mesopleura as a distinct, rounded ridge; mesonotum with 

 a pair of very distinct, subparallel, longitudinal ridges, more approximated in the 

 middle; base of epinotum with a similar pair of ridges which are shorter, more 

 closely approximated and more nearly parallel. In profile the base of the epino- 

 tum is moderately convex and longer than the concave declivity with which it forms 

 a rounded angle. Constriction between meso- and epinotum much the same as in 

 other species, but with a short ridge on each side. Epinotal stigmata very promi- 

 nent. Petiole from above about twice as long as broad, broadest behind and grow- 

 ing gradually narrower anteriorly as far as the stigmata where it narrows more 

 suddenly to the insertion in the epinotum. In profile the node is low and rounded, 

 about half as high as the length of the petiole, with long, straight anterior and more 

 abrupt, slightly concave, posterior slope. Postpetiole as long as broad, campanu- 

 iate, broadest behind, with rounded sides, very feebly excised posterior border and 

 a very feeble dorsal impression behind. Gaster elliptical, without a longitudinal 

 ridge on each side of the first segment. Legs long and rather stout. 



Mandibles glossy, with smooth and shining dentate border, the remaining sur- 

 face finely striated and finely and sparsely punctate. Antennal funiculi slightly 

 shining; body scapes and legs very opaque and very finely and densely punctate; 

 the head, thorax, petiole, postpetiole and gaster being also rather coarsely reticu- 

 late-rugose. 



Hairs much as in other species; black at the base with grayish or yellow tips, 

 coarser and more appressed than in wasmanni, scarcely curved at the base on the 

 tibiae and scapes. Pubescence fulvous, sparse and very short. 



Black or dark brown; mandibles, funiculi, tarsi and articulations of the legs, 

 petiole and gaster ferruginous; mandibular teeth black; impressions between the 

 ridges on the thorax not paler than the surroundipg surfaces. 



