294 CALIFORNIA ACADEMY OF SCIENCES  [Proc. 47H Szr. 
Cotypes, 5 specimens, No. 455, Museum California Acad- 
emy of Sciences, and 6 specimens in author’s collection. 
This variety is readily distinguished from all the other 
forms of planus by the erect, stubby hairs on the cheeks, the 
more abundant pilosity of the head and thorax and the longer 
pubescence on the legs of the worker and female. 
‘z¢ Camponotus (Myrmorhachis) planus indefessus, 
new variety. 
Worker major. Vength 5—6 mm. 
Body shorter and stouter than in the typical planus and 
var. isabelensis, the head larger and broader. Sculpture, pile 
and pubescence as in isabelensis, but the cheeks without erect 
hairs. The ferruginous red color extends back further on the 
head, covering the clypeus, cheeks and front and is suffused 
with the black on the sides and posterior corners. The an- 
tennz and legs, excluding the coxz, are somewhat more 
yellowish. The ridge between the base and declivity of the 
epinotum is scarcely impressed in the middle. 
Worker mmor. Length 4—4.5 mm. 
Very similar to the worker major, even in the color of the 
head. Epinotum very feebly bidentate. 
Described from six major and three minor workers taken 
from a single colony by Dr. Williams, Oct. 25-28, 1905, on 
Indefatigable Island. 
Cotypes, 3 specimens, No. 456, Museum California Acad- 
emy of Sciences, and 6 specimens in author’s collection. 
33. Camponotus (Myrmorhachis) planus santacruzensis, 
new variety. 
Worker major. Length 5.5—6 mm. 
Like the typical planus in stature, in the size of the head, 
sculpture, pilosity and color, but the hairs are even sparser on 
the dorsal surface of the head and thorax and the pubescence 
on the scapes, legs and gaster is distinctly shorter and finer, 
so that the gaster has a less silky lustre. The base of the 
epinotum is straight and horizontal in profile, not concave, 
