464 bulletin: museum of comparative zoology, 



towards its tip, shorter on the head and thorax and confined to the 

 flexor surfaces of the femora and tibiae. Pubescence grayish, very 

 dilute and inconspicuous, except on the antennae. 



Rich yellowish red. Mandibles, corners of clypeus, tarsi, and an- 

 tennal scapes darker. Mandibular teeth black; funiculi, gaster, 

 scutellum, metanotum, a triangular anterior, and two elongate 

 parapsidal blotches on the mesonotum dark bi'own. Wings grayish 

 hyaline, not infuscated, with pale brown veins and darker stigma. 



Male. Length 6.5-7 mm. 



Mandibles 3-4 toothed. Head very short and broad, narrow in 

 front, posterior corners prominent and rounded; eyes large; cheeks 

 short, concave. Clypeus convex, carinate. Thorax broad and robust. 

 Petiole low, thick, transverse, with very blunt border, which, seen 

 from behind, is broadly and distinctly excised. 



Body subopaque; mandibles and frontal area slightly, upper sur- 

 face of gaster more distinctly shining. 



Hairs and pubescence sordid yellow, sparse, and inconspicuous, 

 especially on the upper surface of the gaster. 



Black. Genitalia reddish yellow. Legs sordid yellow; femora, 

 especially the fore pair, more or less infuscated. Wings whitish hya- 

 line, with pale brown veins and slightly darker stigma. 



Hosts (Temporary). F. fusca var. subsericea, and F. pallidefuha 

 schaufussi var. incerta. 



Type locality. — ^ Colorado: Ute Pass and Pike's Peak, 10,000- 

 11,500 ft. (Cockerell and Wheeler). 



Colorado : North Cheyenne Canyon, near Colorado Springs, Floris- 

 sant, Buena Vista (Wheeler). 



New Mexico: Beulah, 8,000 ft. (T. D. A. Cockerell). 



Montana: Helena (W. M. Mann). 



Idaho: Troy (W. M. Mann). 



That this variety is a typical temporary parasite is shown by the 

 fact that I found two small mixed colonies (with F. incerta) on Pike's 

 Peak and that Mr. Mann found a single colony mixed with F. subseri- 

 cea at Troy, Idaho. The adult colonies are large, and form nests under 

 stones or about the roots of plants wliich are banked with considerable 

 vegetable detritus. 



52. F. dakotensis var. specularis Emery. 



F. subpolita var. ? specularis Emery, Zool. jahrb. Syst., 1893, 7, p. 663, 9 



{in part). 

 F. dakotensis Wasmann, Allgem. zeitschr. ent., 1901, 6, p. 6. 

 F. dakotensis Emery var. wasmanni Forel, Ann. Soc. ent. Belg. 1904, 48, p. 



153, nota S 9 cf. 



