80 Journal New York Entomological Society. [Voi. xvii. 



this is true also of the petiole and postpetiole, in imberbictilus of the 

 petiole. From the latter species pima differs also in its much less 

 shining gaster and somewhat smaller size. 



3. Pogonomyrmex (Ephebomyrmex) townsendi, new species. 



Worker. — Length 4 mm. 



Head rectangular, scarcely longer than broad, with straight subparallel sides and 

 feebly excised posterior border. Eyes moderately convex, just in front of the middle 

 of the head. Clypeus short, convex in the middle, with straight, entire anterior bor- 

 der, and a large, blunt, erect tooth in front of each antennal fovea. P'rontal area dis- 

 tinct, carinulate in the middle. Antennal scapes reaching a little more than half 

 way between the eyes and the posterior corners of the head ; funicular joints 3-7 as 

 broad as long, remainingjoints longer than broad. Thorax short, robust, broader in front 

 than behind, with rounded humeri ; dorsum in profile broadly rounded, somewhat de- 

 pressed in the middle. Epinotal spines erect, approximated, and rather bluut, some- 

 what further apart than long, longer than broad at their bases, which are connected 

 by a strong, transverse ridge and continued forward as a pair of ridges bounding the 

 base of the epinotum and backward as another pair bounding the declivity. Meta- 

 sternal teeth acute, laterally compressed, shorter than the epinotal spines. Petiole 

 with a slender, laterally compressed peduncle, which has a blunt, antero-ventral 

 tooth and is distinctly shorter than the node. In profile this has a shorter, straight 

 and abrupt anterior, and a longer, more sloping, convex posterior declivity ; seen 

 from above the latter is subelliptical, about \]A, times as long as broad. Postpetiole 

 carapanulate, as broad as long, in profile evenly rounded above, with a strong an- 

 teroventral protuberance. Gaster small, elliptical. Legs rather stout, with incras- 

 sated femora. 



Subopaque ; mandibles striated throughout ; clypeus longitudinally rugose, the 

 rug£e converging towards the middle of the anterior border. Head covered with 

 coarse longitudinal rugae, which are straight and parallel and do not diverge towards 

 the posterioi corners. These rugie are connected with one another by transverse 

 rugffi and the spaces between them are filled with minute, dense, shallow punctures. 

 Thorax somewhat more coarsely reticulate-rugose than the head, the rugie distinctly 

 longitudinal on the dorsum and pleurse. Neck and base of epinotum between the 

 ridges punctate rugulose ; declivity with a few coarse and irregular rugae. Petiolar 

 node coarsely reticulate-rugose ; postpetiole and basal half of first gastric segment 

 densely and finely punctate, the former with indistinct longitudinal rugae, the latter 

 with sparse, piligerous foveolce. Remainder of gaster and the legs more shining. 

 Antenna] scapes opaque, punctate and longitudinally rugulose. 



Hairs rather short, abundant, pointed, yellowish in some lights, black in others, 

 erect on the body, slightly oblique on the appendages, not elongated to form ammo- 

 chaetse on the gula. 



Rich ferruginous red, thorax somewhat darker behind ; legs and antennae yel- 

 lowish ; mandibular teeth black. 



Described from a single specimen taken by Mr. C. H. Tyler Town- 

 send at Ojo del Cerro Chilicote, Chihuahua, Mexico. 



This species differs from P. (^E. ) ncegeli in the sculpture of the base 



