wheeler: ants of the genus formica. 517 



F. rufibarUs clara Ruzsky, Zool. jahrb. Syst., 1902, 17, p. 471, S 9 cf ; 



Formicar. Imper. Ross., 1905, p. 399. 

 F. fusca rufibarbis var. clara Emery, Deutsoh. ent. zeitschr., 1909, p. 198, 



y 9 d^. 



Worker. Length 5-5.6 mm. 



Head, thorax, petiole, legs, and scapes pale ferruginous red; gaster 

 dark brown; mandibles reddish brown. Some specimens have 

 the tips of the scapes brownish and a spot of the same color on the 

 vertex and occiput. Erect hairs lacking or very sparse; pubescence 

 delicate and not very dense. 



Female. Length 8-9.5 mm. 



Of the same color as very pale forms of the typical rufibarbis or even 

 paler. Pubescence dense, sericeous on the body. Erect hairs sparse. 



Male. Length 8.5-9 mm. 



Head dark brown, thorax and gaster brownish yellow. Mesonotum 

 with three dark brown blotches and with the scutellum, part of the 

 epinotum, petiolar border and spots on the pleurae of the same color. 

 Legs, mandibles, and scapes yellowish browii; funiculi brown; wings 

 infu seated. 



Southern Russia, Siberia, Central Asia, Caucasus, Syria. 



100. F. RUFIBARBIS var. caucasica Ruzsky. 



F. rufibarbis clara var. caucasica Ruzsky, Formicar. Imper. Ross., 1905, p. 401, 



y. 

 F. fusca rufibarbis var. caucasica Emery, Deutsch. ent. zeitschr., 1909, p. 

 198, y . 



Worker. Color as in the var. clara or only slightlj^ darker, red or 

 brownish red. Erect hairs lacking, with sparse, appressed hairs only 

 on the sides of the head and thorax and on the legs and clypeus. Sculp- 

 ture of body more delicate than in the var. clara, the whole body being 

 subopaque, with feeble luster. Frontal area smooth and shining. 



Caucasus Mountains. 



101. F. RUFIBARBIS var. occidua W^heeler. 



F. rufibarbis Wheeler, Amer. nat., 1902, 36, p. 947 et seq, ^ . 



F. rufibarbis var. occidentalis Wheeler, Ants, 1910, p. 570. 



F. rufibarbis var. occidua, nom. nov. Wheeler, Psyche, 1912, 19, p. 90. 



Worker. Length 4-7.5 mm. 



Differing from the typical form of Europe only in pilosity. The 

 thorax is either entirely without erect hairs or has only a few on the 



