WHEELER: ANTS OF THE GENUS FORMICA, 473 
on the thoracic dorsum, clypeus, front, vertex, posterior corners and 
gular surface of head, but absent or very sparse on the cheeks, pleurae, 
and coxae. They are prominent both on the flexor and extensor 
surfaces of the legs. 
Head and thorax red. Gaster black. Even in the largest speci- 
mens the mandibles, anterior border of clypeus and apical half of 
funiculi are dark reddish brown; ocellar triangle, upper surface of pro- 
and mesonotum, much of the upper surface of the petiole, legs and 
coxae, except their articulations, more or less blackened or infuscated. 
Fore coxae largely red. Anal region yellowish. In the smallest 
workers the infuscation is more extensive, involving the whole of the 
posterior portion of the head and epinotum. 
Femave. Length 4.5 mm. 
Resembling the worker in sculpture and pilosity. Head, thorax, 
petiole, and legs yellowish or reddish brown. Tips of funiculi, scutel- 
lum, metanotum, and gaster dark brown; mesonotum with three 
elongate brown blotches. Wings gray, with brown veins and stigma. 
Host (Temporary). F. fusca var. subaenescens. 
Type LocaLtity.— Michigan: Porcupine Mts. (O. McCreary). 
Massachusetts: East Holliston, Sherborn (A. P. Morse). 
This species, too, is very closely related to the typical F. microgyna, 
but both the worker and female are much more densely and coarsely 
pilose and the epinotum of the worker is peculiarly low and rounded. 
The colony of this species found by Mr. Morse at Sherborn, Mass. 
was apparently still mixed with workers of F. fusca var. subaenescens, 
although it contained a few winged females of the parasitic species. 
60. F. apamst Wheeler. 
F. adamsi Wheeler, Journ. N. Y. ent. soc., 1909, 17, p. 84, 8 ; Rept. Mich. 
geol. survey for 1908, 1909, p. 326 8 ; Ants, 1910, p. 570. 
Worker. Length 3.5-5 mm. Allied to F. microgyna. Head, 
excluding the mandibles, a little longer than broad, very nearly as 
broad in front as behind, with straight sides and straight or slightly 
concave posterior border. Eyes rather large. Mandibles 7-8 toothed: 
Clypeus strongly carinate, with broadly rounded anterior border, 
not produced in the middle. Palpi of moderate length. Antennae 
slender, scapes nearly straight at the base, funicular joints all dis- 
tinctly longer than broad, the basal somewhat more slender and longer 
than the apical joints. Pro- and mesonotum moderately convex, 
mesoépinotal constriction rather shallow, broad at the bottom, epino- 
tum with subequal base and declivity, the former slightly convex, the 
