TOO PSYCHE [June 



Head, including the mandibles and cljpeus, subopaque, sharply longitudinally rugose; 

 the rugae connected bj subsidiary reticulate rugae on the base of the mandibles, cheeks, and 

 sides of the head. Cljpeus and frontal area more shining, the former ^vith few rugae, 

 especially near the middle. Thoracic dorsum shining, pleurae and epinotum subopaque. 

 Whole surface of thorax reticulate rugose, regularly in the opaque regions, more irregularly 

 and more longitudinally on the shining dorsal surface. Petiole and postpetiole shining 

 above, reticulate and subopaque on the ventral and lateral surfaces. Gaster very smooth and 

 shining. Legs more opaque, finely but distinctly reticulate. 



Head, thorax, and abdomen beset ^vith sparse, erect, obtuse, silvery white hairs; antennae 

 and legs with minute, appressed, pointed hairs of the same color. 



Body black or, in immature specimens, very dark brown ; mandibles, antennae, legs and 

 epinotal spines, tip of gaster, and sting yellow, scape and club of antennae, bases of epi- 

 notal spines, and greater portion of femora and tibiae infuscated. 



A rare species described from a few specimens taken along Walnut Creek, 

 near Austin (May 12, 1901), and at New Braunfels (June 3, 1901). In the former 

 locality they were found walking on the leaves of bushes, in the latter on a dead 

 limb lying on the ground. ■ I did not succeed in finding the nest which is probably 

 small and not very populous.^ 



This is the first species of Macromischa to be described from the United 

 States, and I am not altogether sure that it is to be assigned to this neotropical genus. 

 It certainly resembles some of our species of Leptothorax with 12-jointed antennae, 

 like L. obturator Wheeler. Emery maintains that Macromischa differs from the 

 other myrmicine genera in the following characters: i. the petiole has a long 

 peduncle; 2. the postpetiole is campanulate and attached by its whole breadth to 

 the first gastric segment ; 3. the thoracic dorsum is continuous, /. e., without sutures 

 or constrictions ; and 4. there are no spurs on the middle and hind tibiae. M. sub- 

 ditiva does not present the second and third of these characters, but it certainly 

 differs from our species of Leptothorax in the remarkable shape of the petiole. 



6. Atta (Trachymyrmex) turrifex, sp. nov. 



Worker. Length 3-3.75 mm. 



Mandibles long, pointed, 7-8 toothed. Clypeus short, with a deep excision in the mid- 

 dle of its anterior border. Head with pointed posterior angles, deeply excised occipital 

 margin and rather straight, subparallel sides. Frontal carinae large, suboblong, conspic- 

 uously concave on their upper surfaces, and continued back to the posterior angles of the 

 head as prominent crenated ridges, on either side bounding a marked concavity for the recep- 



^ Since the above was written I have succeeded in finding a single nest of 71/. subditiva. This was a small cell 

 excavated in the bark of a huge willow {Salix ttigra) near Austin. The cell contained about twenty workers and resem- 

 bled in every way the nests of our corticolous species of Leptothorax. 



