552 ^VHEELER. 



163. Formica hewitti sp. nov. 



Worker. Length 5-6 mm. 



Resembling a large F. fusca. Head a little longer than broad, 

 narrower in front than behind, with straight sides and posterior border. 

 Clypeus sharply carinate, its anterior border produced, rounded, entire. 

 Frontal earinae straight, diverging behind. Antennae as in F. fusca. 

 Epinotum in profile with subequal, straight base and declivity, meet- 

 ing at a pronounced obtuse angle. Petiole convex in front, flat 

 behind, very broad, its superior margin straight and truncated, rather 

 sharp, its sides straight, converging below. Gaster large, elongate. 



Head in front and thorax coarsely shagreened. Cheeks with 

 elongate punctures. Mandibles lustrous, densely striate-punctate. 

 Frontal area smooth and shining. Thorax opaque; head somewhat 

 shining, especially behind; gaster more shining, very finely shagreened. 



Hairs yellowish, erect, sparse on the upper surface of the head, one 

 or more pairs also on the gula. Upper surface of pro- and mesonotum 

 with numerous short, obtuse hairs. Those on the gaster short, obtuse. 

 Legs naked, except for several erect hairs on the flexor surfaces of 

 the femora. Pubescence grayish, short, uniform over the whole 

 body, conspicuously long, but sparse on the sides of the gula. 



Black; thorax dark brown or piceous, mandibles, scapes, three 

 basal joints of funiculus, petiole, coxae and legs deep red. 



Female. Length 7 mm. 



Very similar to the worker in sculpture, color and pilosity, except 

 that the thorax and petiole are black and the mesonotum and scutel- 

 lum are shining. The petiole is very broad and compressed antero- 

 posteriorly, its superior border rather sharp, straight and entire. 

 The erect hairs on the mesonotum and scutellum are longer than in 

 the worker and pointed. Wings colorless, with pale yellowish veins 

 and pale brown stigma. 



Male. Length 6.5 mm. 



Closely resembling the male of the typical fusca, but the head, 

 thorax and petiole are much more pilose and with a few erect hairs on 

 the gula, the antennae and mandibles are entirely black, as are also the 

 coxae and basal halves of the femora. The wings are clearer, with 

 paler veins and stigma. The petiole is somewhat broader, with a 

 much more compressed and more deeply emarginate superior border. 



This species, dedicated to my friend Dr. C. Gordon Hewitt, is 

 described from numerous workers, three females and a single male 

 which I took from several nests under large stones at Emerald Lake 

 (type locality), at Field, British Columbia, and at Laggan, Alberta. 

 Three workers taken by Prof. C. C. Adams at Flathead Lake, Mon- 



