wheeler: ants of the genus formica. 527 



111. F. ciNEREA PiLicoRNis Emery. 



F. fusca var. cinerea Mayr, Verh. Zool. bot. ver. Wien, 1886, 36, p. 427, ^ . 

 F. pilicornis Emery, Zool. jahrb. Syst., 1893, 7, p. 664, ^ 9 cf . 



Worker. Length 3-7 mm. 



Thorax and petiole very much as in the typical cinerea; but in large 

 workers the pro- and mesonotum are very convex and rounded. 

 Petiole rather narrow, thick, with blunt, entire or feebly emarginate 

 superior border. 



Body, including the frontal area, opaque; mandibles densely stri- 

 ated and coarsely punctate. 



Hairs silvery white, short, pointed, more abundant than in the 

 typical cinerea, covering not only the whole body, but also the scapes, 

 legs, and eyes. Pubescence silver gray, very dense and longer than 

 in cinerea, uniformly investing the head, thorax, and gaster, much 

 shorter on the legs and scapes. 



Brownish red; mandibles darker, tips of funiculi, posterodorsal 

 portion of head and dorsal portion of gaster dark brown, but appearing 

 gray on account of the dense pubescence. 



Female. Length 8-10 mm. 



Closely resembling the worker in sculptui'e, pilosity, and color. 

 Three large spots on the mesonotum, the scutellum, metanotum, 

 and sometimes also the pleurae and base of epinotum infuscated. 

 In some specimens the mesothoracic spots become confluent so that 

 the whole dorsal surface of the thorax is fuscous. Wings colorless, 

 with pale yellow ^•eins and darker stigma. 



Male. Length 8-9 mm. 



Very similar in color, sculpture, and pilosity to the male of the 

 typical cinerea, but the scapes have sparse, erect hairs on their anterior 

 surfaces and the eyes are hairy. The upper surface of the gaster is 

 also sparsely hairy. Body, including mandibles and antennae, black; 

 genitalia and legs yellow; in some specimens the middle portions of 

 the femora are deeply infuscated. Frontal area opaque. Wings as 

 in the female. 



Type locality. — California. 



California: San Jacinto, Tres Pinos (Th. Pergande); Mount 

 Pinos (F'. Grinnell Jr.); Point Loma, San Diego County (P. Leonard 

 and Wheeler); Arroyo Seco at Pasadena, Lakeside (Wheeler); Es- 

 condido, San Diego County (J. C. Bradley); Claremont (C. F. Baker); 

 Lake Merced, near San Francisco (F. X. Williams). 



This beautiful ant was described as a distinct species by Emery, 

 but it is really only a very pilose subspecies of cinerea, peculiar to the 



