540 WHEELER. 



Described from numerous workers taken by Mr. Fordyce Grinnell 

 in Mill Creek Canyon, Wilson Peak, 7500 ft., San Bernardino Mts., 

 Southern California. 



116. Formica truncicola subsp. Integra Nyl. var. subcaviceps var. 

 nov. 



Worker. Length: 6-7.5 mm. 



Differing from the typical integra in the following characters: 

 Posterior border of head in largest workers more deeply excavated, 

 almost as deeply as in F. exsectoides Forel. Whole body and especially 

 the gaster more opaque. Gula and posterior corners of head with 

 numerous, delicate, short, erect hairs. Smallest workers distinctly 

 infuscated, entirely dark brown. Median workers with darker legs 

 and petiolar border. 



Male. Length 7 mm. 



Differing from the male integra in having the petiole more com- 

 pressed, with sharp, broadly excavated superior border, the head, 

 thorax and petiole covered with abundant, short, delicate, black hairs 

 and in the coloration of the legs and wings. The femora are black, 

 the tibiae and metatarsi yellow, with indications of infuscation in the 

 middle of the fore and middle tibiae. Wings distinctly paler than in 

 the typical integra. 



Described from a single male and three workers from Medford, 

 Oregon (C. M. Keyes) and two dozen workers taken by Dr. C. G. 

 Hewitt at Dog Lake, Penticton, British Columbia. Six workers 

 taken by Dr. W. M. Mann on San Juan Island, Washington, belong 

 to the same variety but have the upper border of the petiole sharper 

 and more compressed anteroposteriorly. 



117. Formica truncicola subsp. mucescens Wheeler. 

 Colorado: various localities between 7000 and 8000 ft. 



118. Formica truncicola subsp. ohscuriventris Mayr. 

 Montana: Flathead Lake (C. C. Adams). 



Also known from the Eastern and Central States, ®ntario, Colorado 

 and British Columbia. 



119. Formica truncicola subsp. ohscuriventris var. aggerans Wheeler. 

 British Columbia: Emerald Lake (Wheeler); Carbonate, Columbia 



R. 2600 ft. (J. C. Bradley). 



Utah: Promontory Point (A. Wetmore). 



Series of workers from these localities agree perfectly with Emery's 



