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. rufibarbis 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. rusca FuscA var. JAPoNICA Motschulsky. 
F. japonica Motschulsky, Bull. Soc. nat. Moscou, 1866, 39, p. 183, 8. 
F. fusca var. nipponensis Forel, Mitth. Schweiz. ent. gesell., 1900, 10, p. 270, 
8; Mitth. Naturh. mus. Hamburg, 1901, 18, p. 66, 9; Ern. André, 
Bull. Mus. hist. nat. Paris, 1903, p. 128; Wheeler, Bull. Amer. mus. nat. 
hist., 1906, 22, p. 323, 8. 
F. fusca var. japonica Emery, Deutsch. ent. zeitschr., 1909, p.197, 8 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 also from Mongolia. 
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, 8 2; Ed. Leconte, 
1859, 2, p. 7384, 8 o, Dalla Torre, Catalog. Hymen., 1893, 7, p. 213. 
F.. fusca Mayr, Verh. Zool. bot. ver. Wien, 1886, 37, p. 426. 
F. fusca var. subsericea Emery, Zool. jahrb. Syst., 1893, 7, p. 659, 8 2 0; 
Wheeler, Bull. Amer. mus. nat. hist., 1905, 21, p. 401; Occas. papers Bost. 
soc. nat. hist., 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 
