MOUNTAIN ANTS OF NORTH AMERICA. 543 



antennae are darker. The red of the body in larger workers is rather 

 pale and yellowish. The erect hairs are coarse and obtuse and are 

 present on the gula, where none appears in spicata. 



Described from numerous specimens taken from several colonies on 

 Angora Peak, near Lake Tahoe, California, between 7500 and 8600 ft. 

 These colonies were rather populous and were living under stones and 

 logs banked with vegetable detritus. 



136. Formica microgyna subsp. californica subsp. nov. 

 JVorker. Length 3.5-6.5 mm. 



Differing from the other forms of microgyna in the sculpture of the 

 integument and in pilosity. The surface of the head, thorax and 

 petiole is so finely and superficially shagreened as to be distinctly 

 shining, and the gaster resembles that of dakotensis and obscuriventris 

 though more opaque. The pubescence is very short and indistinct 

 and there are no erect hairs on the head, thorax and petiole and only 

 a few on the clypeus. The erect hairs on the gaster are blunt, yellow 

 and sparse. Large workers have the head, thorax, petiole and appen- 

 dages uniformly red, the gaster black; the median workers have traces 

 of infuscation on the ocellar region, and mesonotum. Small workers 

 have the head and petiole above extensively blackened, the thorax 

 clouded with black even on the sides and the coxae and legs, except 

 the knees and tarsi, fuscous. The petiolar node has a sharp border 

 and in many of the small workers is produced upward as a blunt point 

 in the middle. 



Described from numerous workers taken at Glen A' pine Springs, 

 near Lake Tahoe, Cala. (6500 ft.). From one colony of this sub- 

 species on July 26 I took a number of diminutive females resembling 

 those of microgyna subsp. rasilis, but unfortunately the vial contain- 

 ing them was lost. 



137. Formica microgyna subsp. californica var. hybrida var. nov. 

 Worker. Length 3.5-6.5 mm. 



Intermediate between the typical californica and the var. j)inctorum, 

 the color and sculpture being that of the former, the pilosity that of 

 the latter, the pubescence, especially on the gaster, being intermediate. 



Numerous workers from several colonies found in the same locali- 

 ties as the var. pinetorum on Angora Peak near Lake Tahoe. These 

 may represent a true hybrid form but as I have no proof of their 

 genetic origin, I have preferred to give them a varietal name. 



