444 bulletin: museum of comparative zoology. 



38. F. TRUNCicoLA INTEGRA Nylaiidei'. 



F. Integra Nylander, Ann. sci. nat. Zool., 1856, ser. 4, 5, p. 62 yiota, ^ ; 



F. Smith, List Brit. anim. Brit, mus., 1858, pt. 6, p. 54, ^ ; Dalla Torre, 



Catalog. Hymen., 1893, 7, p. 200. 

 F. Integra var. similis Mayr, Verb. Zool. bet. ver. Wien, 1886, 36, p. 425, 



^ 9 cf. 

 F. rufa subsp. Integra Emery, Zool. jahrb. Syst., 189.3, 7, p. 652, pi. 22, figs. 



4, 8; Wheeler, Bull. Amer. mus. nat. hist., 1906, 22, p. 67; Ants, 1910, 



p. 204, 570, fig. 112. 



Worker. Length 4-8 mm. 



Closely resembling the worker of F. truncicola integroides var. hae- 

 morrhoidalis in lacking the pilosity on the head, thorax, petiole, and 

 legs, but the petiole is broader and with a sharper border, the surface 

 of the body is opaque, except the mandibles, frontal area, and gaster 

 which are all somewhat shining. Mandibles sharply, clypeus less 

 distinctly striated. 



Pubescence very fine, visible on the head, thorax, and appendages, 

 but sparse on the gaster so that the surface is visible. Hairs on the 

 gaster very sparse, often more abundant on the venter and tip. Eyes 

 hairless. 



Head, thorax, petiole, and appendages bright red, mandibles darker. 

 Gaster black, only the anal region and extreme base of first segment 

 slightly tinged with red. The red portions of small workers rarely 

 somewhat darker above than in large individuals. 



Female. Length 8-9 mm. 



Closely resembling the worker in sculpture, color, and pilosity. 

 Pubescence on gaster denser so that this region is subopaque or but 

 slightly shining. Mesonotum immaculate or with very faint brownish 

 indications of the three spots. Metanotum black, scutellum, with the 

 exception of its anterior border, infuscated. Wings grayish hyaline, 

 infuscated at the base, with brown veins and stigma. 



Male. Length 7-8 mm. 



Mandibles broad, sometimes indistinctly dentate. Eyes rather 

 large. Petiole compressed, with rather sharp, broadly excised supe- 

 rior border. 



Head and thorax opaque, frontal area strongly, gaster and mandibles 

 more feebly, shining. 



Erect hairs absent on head, thorax, gaster, and appendages. Pu- 

 bescence grayish, rather abundant but fine, most conspicuous on the 

 thorax, legs, and gaster. Eyes hairless. 



Black; antennae dark brown; tips of mandibles reddish. Legs 

 and genitalia yellow, coxae infuscated. Wings somewhat more 

 heavilv and uniformly infuscated than in the female. 



