WHEELER: ANTS OF THE GENUS FORMICA. 543 
123. F. (P.) nasuta Nylander. 
F.. nasuta Nylander, Ann. sci. nat. Zool., 1856, ser. 4, 5, p. 66, 3 ; Ern. André, 
Spec. Hymén. Europe, 1882, 2, pt. 14, p. 177, 8; Forel, Ann. Soc. ent. 
Belg., 1886, 30, p. 205, 8; Nasonow, Arb. Lab. zool. Univ. Moskau, 
1889, 4, p.61; Dalla Torre, Catalog. Hymen., 1893, 7, p. 201. 
F. aerea Roger, Berlin ent. zeitschr., 1859, 3, p. 287, 8 ; Ibid., 1861, 5, p. 164. 
Myrmecocystus nasutus Emery & Forel, Mitth. Schweiz. ent. gesell., 1879, 5, 
p. 449; Emery, Ann. Mus. civ. Genova, 1880, 15, p. 389 nota 8 . 
F. (Proformica) nasuta Ruzsky, Horae Soc. ent. Ross., 1903, 36, p. 304, 8 ; 
Formicar. Imper. Ross., 1905, p. 421, 8 9 o; Emery, Deutsch. ent. 
zeitschr., 1909, p. 200, 8 @ &; Zool. jahrb. Suppl., 1912, 15, p. 100. 
WorkKER. Length 3-5.8 mm. 
Head of small worker elongate, rounded behind, of large worker 
broader and more rectangular. Clypeus indistinctly carinate. Fron- 
tal carinae short and subparallel, frontal furrow distinct only in large 
individuals. Thorax long and low; its dorsal contour in profile angu- 
larly impressed in the mesoépinotal region only in the larger workers; 
seen from above the pronotum is broader than the epinotum, twice 
as broad as the mesonotum and spherically convex. Petiole higher 
than broad, its border more rounded in small individuals, angularly 
excised in large specimens. 
Body very shining; front and clypeus finely longitudinally striated, 
subopaque. 
Erect hairs long and sparse; pubescence very sparse, in some speci- 
mens more abundant on the gaster and somewhat concealing the shin- 
ing surface. 
Brown; larger specimens piceous, often with faint metallic luster; 
mandibles, antennae, and legs paler. 
FemMae. Length, 7 mm., without the gaster 4.3 mm. 
Head rather square, scarcely longer than broad, the scapes extend- 
ing but little beyond the posterior corners of the head. Thorax 
narrower than the head, with parallel sides and flat dorsal surface. 
Petiole high, with sharp dorsal border, deeply and angularly excised 
in the middle. 
Sculpture as in the larger workers; pubescence denser, gray; color 
somewhat darker. 
Mate. Length 6-7.5 mm., of fore wings 5.5-6.2 mm. 
Head rounded, somewhat longer than broad, the eye about 2 the 
length of thelateral border. Petiole thick, its border obtuse, and seen 
from behind excavated in the middle. Gaster, excluding the geni- 
talia, as long as the thorax, with distinct intersegmental constrictions; 
subgenital plate obtusely trilobed. Stipes slender projecting far 
beyond the volsellae and sagittae. Wings with a well-developed 
discoidal cell. 
