PSYCH K. 



A DECAD OF TEXAN FORMICIDAE.i 



BY WILLIAM MORTON WHEELER, AUSTIN, TEX. 

 I. ECITON (ACAMATUS) PAUXILLUM, Sp. nOV. 



Worker. Length 1.75-2 mm. 



Mandibles with a verv prominent basal tooth. Head, including mandibles, fullv twice as 

 long as broad, occipital border slightly concave, posterior angles rather sharp, sides subpar- 

 allel. Eyes completely absent. Antennal scape thick, not reaching half way to the posterior 

 angle of the head, funiculus robust, 

 first joint nearly as long as the second 

 and third together, joints 2-6 distinctly 

 broader than long; joints 7-9 about as 

 wide as long. Thorax flattened dor- 

 sally, laterally compressed, with dis- 

 tinct mesoepinotal constriction ; basal 

 surface of epinotum flattened, longer 

 than the declivity, with which it forms 

 a rounded, obtuse angle. Petiole and 

 postpetiole, whether seen from above 

 or in profile, of similar size and form; 

 each fuinished with an anterior ven- 

 tral tooth ; petiole distinctly longer 

 than the postpetiole, longer than 

 broad, subelliptical from above ; post- 

 petiole not longer than broad, some- 

 what wider behind than in front. 

 Gaster elongate elliptical, distinctly 

 flattened dorso-ventrally. Legs short 

 and robust. Claws simple. 



Smooth and shining, especially 

 the head and thoracic dorsum ; sides 

 of neck, meso- and metapleurae, to- 

 gether with the ventral surfaces of the 

 petiole and postpetiole, distinctly and 

 evenly reticulate. Mandibles, head 



Fig. I. a, Eciton pauxillum, sp. nov. Worker: b, head of same; 

 c, head of E. comiiuitatuni Emerj- ; d, mandible of same. 



and thorax with coarse but scattered piligerous punctures. 



^ Contributions from the Zoological Laboratory of the University of Texas. No. 49. 



