418 bulletin: museum of comparative zoology. 



pastures at altitudes of about 6,000-7,000 ft. The colonies, which 

 are rather small and comprise only a few hundred workers, make small 

 obscure crater nests like those of F. schaufussi and its varieties in the 

 Eastern States. I have never found munda nesting under stones, 

 and in no colony have I been able to find any slaves. There is, indeed, 

 absolutely nothing to indicate that this ant is ever parasitic or dulotic. 



15. F. PERGANDEi Emery. 



F. pergandei Emery, Zool. jahrb. Syst., 1893, 7, p. 646, pi. 22, fig. 1, g ; 

 Wheeler, Bull. Amer. mus. nat. hist. 1905, 21, p. 268; Ants, 1910, p. 458, 

 470. 



Worker. Length 5.5-6.5 mm. 



Mandibles 8-toothed. Maxillary palpi short and very slender. 

 Head longer than broad, with long, flat or slightly concave cheeks, 

 converging anteriorly; posterior border straight. Clypeus carinate, 

 not very convex, its anterior margin impressed and rather broadly 

 and deeply notched in the middle. Antennae slender, the scapes 

 not distinctly enlarged towards their tips. Thorax rather long and 

 slender, pro- and mesonotum not very convex, mesoepinotal constric- 

 tion well developed, epinotum in profile roundly anguhu', with sub- 

 equal base and declivity, the former horizontal, the latter sloping. 

 Petiole narrow, more convex anteriorly than posteriorly, with an 

 obtuse, entire superior border. 



Mandibles and clypeus shining, the former finely striated and in- 

 distinctly and sparsely punctate, the latter indistinctly, longitudinally 

 rugulose. Head, thorax, and petiole smooth, subopaque, gaster and 

 legs shining. Frontal area shining, except in the center. 



Hairs slender and grayish, very sparse on the pronotum and dorsal 

 surface of the head, more abundant on the gaster. There are a few 

 erect hairs on the gula, at least in some specimens. Pubescence very 

 sparse on the head and thorax, longer on the gaster, but not sufficiently 

 dense to conceal its shining surface. Legs and scapes with minute 

 subappressed hairs; tibiae with a row of slanting bristles on their 

 flexor surfaces. 



Brownish testaceous; mandibles darker; mandibular teeth and 

 gaster black. 



Host (Slave?). F. paUidefulm. 



Type locality. — District of Columbia: Washington (Th. Pergande). 

 Massachusetts (J. G. Jack). 



This species seems to be extremely rare. I have seen two cotypes 

 kindly sent me by Prof. Emery and two specimens from Massachusetts 



