516 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
long ago showed that its habits and disposition are peculiar. It nests 
under stones or in open ground without building craters or mounds 
and in disposition is quite unlike the fusca forms, being very agile, 
fierce, and aggressive. It also has a peculiar odor quite unlike that of 
fusca, and this, together with the pugnacious disposition, also charac- 
terizes the American varieties. 
97. F. RUFIBARBIS var. GLAUCA Ruzsky. 
F. rufibarbis var. glauca Ruzsky, Arb. Ges. naturf. Kasan, 1895, 28, p. 20, 8 ; 
Berlin. ent. zeitschr., 1896, 41, p. 70; Forel, Ann. Mus. St. Petersbourg, 
1904, 8, p. 385; Ruzsky, Formicar. Imper. Ross. 1905, p. 396. 
F. fusca rufibarbis var. glauca Emery, Deutsch. ent. zeitschr., 1909, p. 198, 8. 
Worker. Differing from the typical form in having the pubescence 
denser and with a bluish, silky luster on the gaster. The color and 
pilosity are like those of the typical form. 
Southern Russia and Western Siberia. 
98. F. RUFIBARBIS var. SUBPILOSA Ruzsky. 
F. rubibarbis var. subpilosa Ruzsky, Ants envir. Aral Sea (Russian), 1902, p. 
9, 8; Zool. jahrb. Syst., 1902, 17, p. 472; Forel, Ann. Mus. St. Peters- 
bourg, 1904, 8, p. 18; Ruzsky, Formicar. Imper. Ross., 1905, p. 397; 
Karawajew, Hor. Soc. ent. Ross., 1909, 39, p. 16. 
F. fusca rufibarbis var. subpilosa Emery, Deutsch. ent. zeitschr., 1909, p. 198, 8 . 
WorkKER. Color as in pale specimens of the typical rufibarbis. 
Pubescence whitish, dense on the gaster, which therefore has a gray 
tinge. Hairs also whitish, short, covering the whole body, but absent 
on the gula. Petiole moderately thick, with rather sharp superior 
border. 
Central Europe, Southern Russia, and Central Asia to Western 
China. 
This form resembles F. cinerea var. imitans but can be distinguished 
by the absence of erect hairs on the gula. The color, according to 
Ruzsky, is very variable, specimens from the Aral Sea region being 
very pale, like the var. clara, whereas those from Central Europe, the 
Crimea, Southeastern Russia, and the Caucasus are darker and more 
like the typical rufibarbis. 
99. F. RUFIBARBIS var. CLARA Forel. 
F. rufibarbis var. clara Forel, Ann. Soc. ent. Belg., 1886, 30, p. 206, 8 ; Ann. 
Mus. St. Petersbourg, 1904, 8, p. 384. 
