256 PROCEEDINGS OF THE ACADEMY OF [Feb., 



in the "black waxy" soil under the center of a large flat stone. Two 

 other nests taken at Austin exhibited a tendency toward plesiobiosis. 

 One of these was found in the vegetable debris at the very entrance 

 of the nest of a timid fungus-growing ant {Tracliymyrmcx turrifex 

 Wheeler), the other under a stone at the very edge of a flourishing 

 colony of Pheidole instabilis Emery. 



L. terrigena is undoubtedly closely allied to L. Andrei Emery, which 

 I have not seen. The worker differs, however, in its decidedly smaller 

 size, shape of petiole and postpetiole, its larger and stouter epinotal 

 spines, the absence of a clypeal sinuosity, a shining longitudinal band 

 on the front and vertex, and the absence of infuscation on the abdomen, 

 although the last character is clearly present in the female. 



18. Leptothorax Andrei Emerj-. 



L. Andrei Emery, Morpli. Jahrb. Abth. f. Syst., VIII, 1894, pp. 318, 322. 



Worker (PI. XII, fig. 22).— Length 2.25 mm. 



Clypeus feebly carinate in the middle, its anterior border subsinuate. 

 Antennae 12-jointed; first funicular joint a little shorter than the three 

 succeeding joints; second joint of club a little longer than the preceding 

 joint. Thoracic dorsum without a mesoepinotal constriction. Epi- 

 notal spines in the form of short, stout teeth. Petiole with a rather 

 long peduncle, its node above subrotund. Postpetiole about a third 

 broader than the petiole, a little broader than long. 



Mandibles striated. Head opaque, longitudinally rugulose-punc- 

 tate; cheeks and clypeus striated, the latter and a median line along the 

 front and vertex shining. Thorax and pedicel opaque; the former 

 densely, the latter more faintly punctate. Gaster and legs shining. 



Hairs on the body sparse, short and clavate. 



Testaceous, abdomen darker behind, legs pale. 



Type locality: Cahfornia (Andre). 



The species was described from a single specimen in the collection of 

 Prof. Emery. 



19. Leptothorax (Dicliothorax) Pergandei Emery. 



L (£>.) Pergandei Emery, Zool. Jahrb. Abth. f. Svst., VIII, 1894, pp. 318-323, 

 324. ? . 



Worker (PI. XII, figs. 23 and 23a).— Length 2.5-3.25 mm. 



Mandibles rather broad, 5-toothed. Clypeus moderately convex, 

 broadly rounded in front, with a distinct median carina. Antennae 

 12-jointed, scape extending beyond the posterior angle of the head a 

 distance fully equal to twice its breadth; first funicular joint as long 

 as the three succeeding joints together; joints 3-8 nearly as long as 

 broad; club 3-jointed, the two basal joints subequal, together shorter 



