248 JoL'RXAL Xew York Entomological Society. l\oi. xix. 



characteristic of a purely temporary physiological condition. They 

 may be modifications of the bluish bloom often found covering speci- 

 mens of Trachymynnex and Cyphomyrniex and apparently analogous 

 to the waxy secretion covering the bodies of senescent dragon flies 

 and the surface of Rynchophorous beetles of the genus Lixus. 



Among the material collected by Mr. Hartman during September, 

 191 1, I find a couple of workers representing the following sub- 

 species of T. tiirrifcx, a species which has been taken heretofore 

 only in the dry central and western portions of Texas : 



A. (T.) turrifex Wheeler subsp. caroli, new subspecies. 



Worker. — Length 2.5-2.8 mm. 



Differing in its smaller size from the typical turrifex. which measures 

 3-3.75 mm. and in coloration, the whole body with appendages being brownish 

 yellow, with the front and vertex infuscated. The hooked hairs covering the 

 body and appendages are neither coarser nor more abundant than in the typical 

 form, but their dark brown color, contrasting with the pale integument, makes 

 them more conspicuous. The tubercles are very small and acute, especially on 

 the gaster. This region lacks the median longitudinal impression and lateral 

 ridges, which though feebly developed, are nevertheless distinct in the typical 

 form. 



Described from two specimens taken from the same colony at 

 Huntsville, Texas, by Mr. C. G. Hartman. This form evidently 

 represents a depauperate, arenicolous race ranging considerably east- 

 ward of the typical turrifex. 



The following table will assist in distinguishing the various forms 

 described above as well as the other known species and varieties of 

 the subgenus Trachymyrfiicx from North, South and Central America: 



1. Antennal scape furnished with a lobe at the base 2 



Antennal scape without a lobe at the base 3 



2. Lobe of antennal scape long and narrow ; posterior angles of head usually 



acute ; surface of body scabrous, not pruinose. Length 3.25—4.5 mm. 



Rio Grande do Sul iheringi Emery. 



Lobe of antennal scape short and broad ; posterior angles of head obtuse ; 

 surface of body smoother, pruinose. Length 3.2—4 mm. Buenos Aires. 



pruinosa Emery. 



3. Preorbital carina not curved mesially behind nor crossing the antennal 



scrobe, but continued backward to the posterior corner of the head 4 



Preorbital carina curved inward and entering the antennal scrobe, or at 

 any rate, not extending to the posterior corner of the head 10 



4. Antennal scapes not extending beyond the posterior corner of the head. . .5 

 Antennal scapes extending beyond the posterior corners of the head 7 



