wheeler: ants of the genus formica. 499 



This variety is known only from Central Europe. It is common 

 in Switzerland, the type locality, inhabiting the same stations and 

 nesting in the same manner as the var. glebaria. It is often confused 

 with F. rufiharhis on account of its color, but this species usually lacks 

 the dark spots on the thorax and is fierce and aggressive, whereas 

 glebaria, like all the other varieties of fusca, is very timid. 



83. F. FUSCA FUSCA var. japonica Motschulsky. 



F . japonica Motschulsky, Bull. Soc. nat. Moscou, 1866, 39, p. 183, ^ . 



F. fusca var. nipponensis Forel, Mitth. Schweiz. ent. gesell., 1900, 10, p. 270, 

 y ; Mitth. Naturh. mus. Hamburg, 1901, 18, p. 66, 9 ; Ern. Andre, 

 Bull. Mus. hist. nat. Paris, 1903, p. 128; Wheeler, Bull. Amer. mus. nat. 

 hist., 1906, 22, p. 323, ^ . 



F. fusca var. japonica Emery, Deutsch. ent. zeitschr., 1909, p. 197, ^ 9 . 



Worker. Length: 4-5.5 mm. 



Head, thorax, and gaster opaque, rather coarsely shagreened. 

 Mandibles coarsely striatopunctate. Legs slightly shining. Hairs 

 and pubescence white, the former short, sparse, on the gaster stubby 

 and obtuse, the pubescence very short, moderately dense and giving 

 the surface a slightly pruinose appearance. Body black; mandibles, 

 antennae, tarsi, sutures of thorax, and articulations of legs brown. 



Female. Pilosity, sculpture, and color as in the worker. 



This ant appears to be common in Japan. Forel's specimens came 

 from the Island of Yezo and from Tokio. I have seen specimens from 

 Misaki, Kanagawa (1,700 ft.), Yamanaka, and Takakiyama. Accord- 

 ing to Emery, Ruzsky has recorded this variety ajso from IVIongolia. 

 It approaches the North American var. subsericea in some respects, 

 but is peculiar in the dull opacity of the body. 



84. F. FUSCA FUSCA var. subsericea Say. 



F. subsericea Say, Bost. journ. nat. hist., 1836, 1, p. 289, ^ 9 ; Ed. Leconte, 

 1859, 2, p. 734, 9 &, Dalla Torre, Catalog. Hymen., 1893, 7, p. 213. 



F. fusca Mayr, Verh. Zool. hot. ver. Wien, 1886, 37, p. 426. 



F. fusca var. subsericea Emery, Zool. jahrb. Syst., 1893, 7, p. 659, y 9 d^; 

 Wheeler, Bull. Amer. mus. nat. hist., 1905, 21, p. 401; Occas. papers Bost. 

 soc. nat. lii.st., 1906, 7, no. 7, p. 19. 



Worker. Length 4-7 mm. 



Base of epinotum often slightly convex, longer than the sloping, 

 slightly concave declivity. Head in the largest workers as broad 



