416 bulletin: museum of comparative zoology. 



towards their tips which are truncate. The hairs of the thorax have 

 the same form ; and there are a few of them also on the border of the 

 petiole (Emery). 



Emery described this subspecies from a single worker taken in 

 New Mexico. For some time I attributed several specimens in my 

 collection from the same state to this subspecies, but closer examina- 

 tion shows them to belong to what I described as F. munda. I must 

 admit, therefore, that I have never seen the true ohtusopilosa. My 

 reasons for believing that F. munda is a distinct species are given below. 



14. F, munda Wheeler. 



F. pergandei var. Emery, Zool. jahrb. Syst., 1893, 7, p. 647, ^ . 

 F. munda Wheeler, Bull. Amer. mus. nat. hist., 1905, 21, p. 267, S 9 ; Ants, 

 1910, p. 458. 



Worker. Length 5-7 mm. 



Mandibles 8-toothed. Head, excluding mandibles, usually some- 

 what longer than broad, with straight or slightly convex posterior 

 border and long cheeks, converging anteriorly and slightly convex 

 or flattened. Clypeus sharply carinate, with a rather deep and broad 

 notch in its anterior border. Antennae slender, scapes not enlarged 

 towards their tips. Thorax rather low and narrow, pro- and mesono- 

 tum not very convex, mesoepinotal constriction shallow, epinotum 

 long and low, its basal surface horizontal in profile and somewhat 

 longer than the very sloping declivity into which it passes through a 

 rounded angle. Petiole low and thick, convex in front, flattened 

 behind, with a very obtuse, entire superior border. Seen from behind 

 the border is transverse, broadly rounded, but passing rather abruptly 

 into the straight sides, which converge below. Gaster small; legs 

 slender. 



Head and thorax subopaque, very finely shagreened. Mandibles, 

 anterior portion of head, and especially the borders of the frontal 

 area and sides of the clypeus, more shining. Mandibles sharply 

 striatopunctate. 



Pubescence grayish, sparse, except on the gaster where it is long and 

 dense and conceals the shining surface, except at the intersegmental 

 incisures. Hairs on the body rather abundant, glistening white, 

 obtuse, suberect, and rather long on the upper surface of the head, 

 thorax, and gaster; on the gaster very regularly distributed. Petio- 

 lar border with a row of similar hairs. Legs invested with small, 

 sparse, appressed hairs; femora and tibiae with a row of erect or 

 oblique hairs on their flexor surfaces. 



