142 Memorias de la Sociedad Científica 



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insertion o£ the f ore wing; postscutellum and posterior portion 

 of scutellum black; basal third o£ first gastric segment dis- 

 tinctly red. 



Top of head, mesonotum, mesopleurae, scutellum and gas- 

 ter very glabrous; the other parts, especially the epinotum 

 and metapleursB subopaque. 



Hairs on the body much less conspicuous and relatively 

 shorter than iu the worker, so that the glabrous surf aces are 

 much more striking to the naked eye. 



Type locality: Cañón City, Colorado (Rev. P. J. Schmitt 

 O. S. B.) 



Other localities: Catopaxi, Colorado (Schmitt); Tempe, 

 Arizona (Prof. T. D. A. Cockerell); Paraje, Las Vias, and Las 

 Valles, New México ( Cockerell ) ; San Esteban near Marfa, 

 Presidio County, Texas (W. M. Wheeler)j Coahuila, México 

 (A. F. Rangel). 



Description drawn f rom numerous workers and four deál^ 

 ated females. 



This very distinct variety seems to have been known to 

 Prof. Emery, but was not separated by him f rom the typical 

 T. suhpoUta Mayr. in his "Beitráge zur nordamerikanischen 

 Ameisenfauna." T. subpolita sensustricio is characterized by the 

 much less abundant pilosity, which is yellowish and not sil- 

 very white as in perpilosa, and by the darker and less glabrous 

 head and thorax. The typical f orm is very common in central 

 California where it has been collected for me by my f riend Dr. 

 Harold Heath of the Leland Stanford University. 



December 21''-, 1901, I had an opportunity to observe the 

 nests of the new variety above desoribed, at San Esteban, á 

 few miles south of Marfa, Texas. These nests were dug about 

 the roots of some shrubs in the tall, dry grass of a meadow, 

 and very closely resembled the nests sometimos constructed 

 by T. fusca va. subsericea Say iu grassy fields in the Northern 

 Cnited States. San Esteban was the only locality in which I 

 succeeded in finding these ants in the Trans-Pecos. 



University of Texas. May 7*1^ 1902. 



