WHEELER: ANTS OF THE GENUS FORMICA. 411 
F. sanguinea subsp. subintegra Wheeler, Bull. Amer. mus. nat. hist., 1908, 
24, p. 627; Ants, 1910, p. 458, 570. 
WorkKeErR. Length 4-7 mm. 
Head with the posterior corners and sides more rounded than in 
the preceding forms. Clypeus with broad but shallow emargination. 
Antennal scapes usually but slightly thickened towards their tips. 
Pro- and mesonotum not very convex, epinotum somewhat rounded in 
profile. Petiole thick anteroposteriorly, narrow seen from behind, 
convex in front, flattened behind, with blunt, usually entire superior 
border. 
Surface of body rather smooth and somewhat lustrous or shining, 
especially the mandibles and posterior corners of the head; frontal 
area shining, except in the middle. 
Pilosity and pubescence yellow, the former represented by a few 
hairs on the dorsal surface of the head, sometimes a few on the pro- 
notum and by a number of scattered hairs on the gaster, longest at 
the tip and on the venter. Rarely there are a few hairs on the petiolar 
border, and on the gula. Pubescence abundant and dense on the 
gaster, somewhat finer on the remainder of the body but clearly visible 
under a lens magnifying 16 diameters. Surfaces of femora and tibiae 
with very fine, appressed pubescence, which is dense on their anterior 
and sparse on their posterior faces. Femora without hairs, tibiae 
with a row of graduated bristles on the flexor surface. 
Red color of head, thorax, petiole and appendages usually tinged 
with yellow. Mandibles darker, with black teeth. Gaster brown. 
FremMate. Length 7-9 mm. 
Closely resembling the worker in pilosity and color. Surface of 
body more opaque. Mandibles, clypeus, front, antennae, tibiae, 
and tarsi and sometimes also three spots on the mesonotum, brownish. 
Wings rather heavily infuscated at their bases. Petiole like that of 
the worker but broader. 
Mate. Length 7-8 mm. 
Mandibles with rather narrow blades, pointed, edentate. Clypeus 
with rounded, entire anterior border, carinate, often with an indis- 
tinct transverse impression just back of its anterior border and another 
near its posterior end. Petiole thick, transverse, with blunt, feebly 
and broadly excised dorsal margin. 
Pubescence similar to that of the worker, more dilute on the gaster, 
so that this region appears more shining. Erect hairs very short, 
confined to top of head, mesonotum and scutellum. 
Body black; antennae brown; legs and genitalia yellow; wings 
rather more heavily infuscated than in the female. 
Hosts (Staves). F. fusca and its vars. subsericea, subaenescens, 
F. cinerea var. neocinerea, F. neogagates and vidua; F. pallidefulva 
schaufussi, nitidiventris, fuscata, and incerta. 
