wheeler: ants of the genus formica. 459 



Bright yellowish red, mandibles and antennal scapes darker; funi- 

 culi and legs reddish brown, their articulations more yellowish. Gaster 

 black, anal segment, a large spot at the base of the first segment and 

 often a spot on each of the sternites, yellow or red. Some of the small- 

 est workers have the vertex, pro- and mesonotum blotched with black, 

 but others have the head and thorax almost as immaculate as large 

 individuals. 



Female. Length 7.5-9 mm. 



Head resembling that of the worker but with less convex sides. 

 Carina of clypeus delicate. Thorax nearly as broad as the head, 

 robust. Petiole very broad, much compressed anteroposteriorly, 

 feebly convex in front, flattened behind, the sharp border broadly 

 rounded, more rarely bluntly angular in the middle. 



Mandibles striatopunctate, somewhat less shining than the re- 

 mainder of the body, which, together with the appendages, is smooth ; 

 the upper surface of the head, mesonotum, and scutellum, especially 

 are highly glabrous. 



Entire body, including the antennal scapes and legs, covered with 

 short, delicate, erect or suberect, silvery white hairs which nowhere 

 conceal the shining surface. These hairs are abundant and conspicu- 

 ous on the scapes, legs, and gaster, less abundant on the front of the 

 head, and on the mesonotum, at least in some specimens. Eyes, 

 hairy. 



Color rich yellowish red; mandibular teeth, anterolateral borders 

 of clypeus, thoracic sutures, alar insertions, metanotum, and adja- 

 cent border of scutellum, posterior border of each gastric segment, 

 palpi, articulations of legs, and terminal half of funiculi, black or 

 infuscated. AYings uniformly gray, veins and stigma sordid yellow. 



Male. Length 7-8 mm. 



Mandibles 3-4-toothed. Maxillary palpi slender, 5-jointed. Head 

 small, eyes large, cheeks rather concave, postocular region less promi- 

 nent than in the male ciliata. QXy^yexxs sharply carinate. Thorax 

 robust, decidedly broader than the head. Petiole low, cuneate in 

 profile, thick at base, but becoming rapidl.v thin towards the superior 

 border, which when seen from behind is feebly and broadly excised 

 in tlie middle. 



Body opaque, finely shagreened; frontal area shining; mesonotum, 

 scutellum, and gaster above slightly lustrous. 



Hairs gray, dense, longest and suberect on the head, thorax, and 

 petiole, more recliuate on the gaster, very short and subappressed on 

 the legs and antennae. Eyes distinctly hairy. Gaster delicately 

 gray pubescent. 



Deep black; genitalia, tips of trochanters, knees, basal portions 

 of first and second tarsal joints, reddish yellow. Wings like those of the 

 female, except that the stigma is darker. 



