552 bulletin: museum of comparative zoology. 



nests under stones but constructs craters two to four inches in diameter, 

 with a central opening ^-f inches in diameter, made of coarse sand or 

 pebbles. These nests resemble those of certain subspecies of Myrme- 

 cocystus viclliger in Colorado, Western Texas, and Mexico. The 

 beautiful yellow males and red females were taken May 26. 



134. F. (N.) PALLiDEFULVA scHAUFussi Mayr. 



F. schaiifussi Mayr, Sitzb. K. akad. wiss. Wien, 1866, 53, p. 493, fig. 6, ^ ; 



Verb. Zool. hot. ver. Wien., 1870,20, p. 951; McCooli, Proc. Acad. nat. 



sci. Pliil., 1880, p. 377; Ibid., 1887, p. 29; Dalla Torre, Catalog. Hymen., 



1893, 7, p. 212. 

 F. pallidefulva subsp. schaiifussi Emery, Zool. jahrb. Syst., 1893, 7, p. 654, 



taf. 22, figs. 17, 18, ^ ; Wheeler, Bull. Amer. mus. nat. hist., 1904, 20, 



p. 370. 



Worker. Length 5-7 mm. 



Averaging somewhat larger than the preceding forms of the species, 

 and differing also in having the two terminal joints of the maxillary 

 palpi somewhat shorter and in pilosity and color. The erect hairs 

 are longer and more numerous and are not only present on the gaster 

 and upper surface of the head, but also on the gula, thoracic dorsum, 

 and petiole. The pubescence is much longer and more distinct, 

 especially on the gaster. The color of the head and thorax is more 

 brownish yellow, the gaster more or less infuscated. The mandibles 

 are red. 



Female. Length 8-10 mm. 



Head, excluding the mandibles, as broad as long, rarely a little longer 

 than broad. Thorax sometimes more slender than in the female of 

 the typical pallidefulva and its variety succinea. Petiole broad, 

 flattened behind, wth entire, broadly rounded border. Sculpture, 

 pilosity, and color as in the worker, hairs very long and abundant on 

 the upper surface of the body, on the gula and petiolar border and 

 especially long on the gaster. Mesonotum usually with three large, 

 elongate brown spots, and the gaster with the bases and posterior 

 borders of the segments a little more brownish than their central por- 

 tions. In some specimens the whole of the mesonotum and gaster 

 is deep brown. Wings hyahne, sometimes sUghtly tinged with yellow; 

 veins and stigma pale brown. 



Male. Length 8-9 mm. 



Mandibles edentate or obscurely bidentate, with rather narrow 

 blades. Head as in the t>T)ical form of the species. Petiole low, 

 thick in profile below, with a rather sharp upper border, which is dis- 

 tinctly excised in the middle; both its anterior and posterior surfaces 



