284 CALIFORNIA ACADEMY OF SCIENCES  [Proc. 47H Ser. 
The six specimens regarded as major workers may possibly 
be mediz, but the whole appearance of the series, and espe- 
cially of the female, suggests a distinct variety characterized 
by the small stature of all the castes and a very incomplete 
polymorphism of the worker caste in particular. The colora- 
tion of the male is peculiar. 
23. Camponotus (Myrmamblys) macilentus albemarlensis, 
new variety. 
Worker major. Length 7—7.5 mm. 
Closely resembling the vars. jacobensis and barringtonensis, 
but the head is slightly broader in front and more nearly 
rectangular, and the clypeus is distinctly broader in propor- 
tion to its length, being only a little longer than broad and 
much less distinctly carinate behind. The antennal scapes do 
not reach beyond the posterior corners of the head. On the 
mandibles, clypeus and head the punctures are much finer than 
in jacobensis so that the surfaces are more shining. The color 
is similar to that of barringtonensis and duncanensis, being 
pale, ivory yellow, the gaster, coxze and legs a little paler than 
the head and thorax, which are immaculate. The brown 
bands on the gaster are well-developed, darker than in dun- 
canensis, but paler than in jacobensis, and there are distinct 
though interrupted portions of the mid-dorsal streaks. The 
knees are brownish, the antennze and tarsi reddish. 
Described from two specimens taken by Dr. Williams dur- 
ing May, 1906, on Mt. Cowley, South Albemarle. 
Cotypes, 2 specimens, No. 453, Museum California Academy 
of Sciences. 
24. Camponotus (Myrmamblys) macilentus vulcanalis, 
new variety. 
Worker major. Length 5—6 mm. 
Head and clypeus broad as in the preceding variety, but the 
head with somewhat more convex sides. Antennal scapes 
extending a distance equal to their greatest width beyond the 
posterior corners of the head. Clypeal carina obsolete. Thor- 
acic dorsum in profile nearly straight, much less convex than 
in the other forms. Color brownish yellow, thorax immacu- 
