560 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
joints of funiculi, a large spot on the pronotum, a smaller one on the 
mesonotum, the upper surface of the petiole, the coxae, femora and 
in some specimens also the apical half of each tibia and the pleurae, 
dark brown or fuscous. 
TyPE LocaLity.— Arizona: Bright Angel Trail, Grand Canyon 
5,500-7,000 ft. (Wheeler). 
Arizona: Prescott (Wheeler). 
Utah: Milford (J. C. Bradley). 
This species appears to belong in the pallidefulva group, although 
the sculpture of the body is very unlike that of the preceding species. 
Superficially it resembles F. rufibarbis, but the head, thorax, and an- 
tennae are much more like those of pallidefulua. There is, however, 
much that recalls Myrmecocystus in the structure of the thorax seen 
in profile. 
F.. moki nests under stones and forms colonies about the size of those 
of F. pallidefulva and its various subspecies and varieties. It probably 
represents this species in the dry deserts of the southwest, but is 
certainly a much rarer ant. 
ADDENDUM. 
The following notes and descriptions relate to specimens discovered 
after the manuscript of this paper was ready for the press. 
140. F. TRUNCICOLA INTEGROIDES var. RAVIDA, var. nov. 
WorkKER. Length 4-6 mm. 
Like the var. haemorrhoidalis Emery in pubescence and sculpture 
and in lacking erect hairs, except on the gaster, but differing in color. 
The red of the head, thorax, and petiole is much deeper and not. 
yellowish, the legs, whole of the funiculi, tips of the scapes and the 
gaster are black and even the largest workers have a large black spot 
on the pro- and mesonotum. In small workers the red color is darker 
and more brownish, the whole thorax is blackish and the posterior 
portion of the head and the whole of the scapes are infuscated. The 
surface of the body in all of the workers is opaque, the pubescence 
on the gaster short, dense and dark gray in color; the red anal spot 
is much restricted. 
FEMALE. Length 8.5-9 mm. 
Differing from the female of haemorrhordalis in having the tips of 
the scapes, the posterior border of the pronotum, three spots on the 
