Voz. II, Pr. II] WHEELER—GALAPAGOS ISLANDS ANTS 283 
Cotypes, 17 specimens, No. 451, Museum California Acad- 
emy of Sciences, and 12 specimens in author’s collection. 
22. Camponotus (Myrmamblys) macilentus duncanensis, 
new variety. 
Worker major. Length 5—5.5 mm. 
Distinctly smaller than the two preceding forms. Head 
proportionally shorter, with less convex cheeks and broader 
clypeus, the antennal scapes extending nearly one-quarter 
their length beyond the posterior corners of the head. The 
punctures on the mandibles, clypeus and head and the foveolz 
on the pro- and mesonotum are more feebly developed, so that 
the head is much more shining. The color is much like that 
of barringtonensis, pale ivory yellow, but there are no dark 
markings on the head and thorax and the bands on the gaster 
are narrow and rather sharply defined, reddish brown, the 
mid-dorsal marking either absent or present only as a narrow, 
more or less interrupted line. 
Worker minor. Length 4—4.5 mm. 
Colored like the worker major, but some specimens have 
the meso- and epinotum and a cloud on the vertex pale 
brownish. The bands on the gaster are usually reduced to 
brown transverse lines and the mid-dorsal markings are fre- 
quently absent. 
Female (dealated). Length 7 mm. 
Colored like the worker major, i. e. without any dark 
markings on the head and thorax. The gastric bands are 
well-developed, but there are mid-dorsal markings only on the 
third and fourth segment, where they appear as small spots. 
The head is shining, owing to the very feeble development of 
the punctures. 
Male. Length 4.5—5 mm. 
Differing from the male of jacobensis in color, the body 
and legs being rather dark brown, with paler brown thorax 
and antenne. The wings are rather opaque. 
Described from a single female, six major workers, 17 minor 
workers and four males taken August 13-14, 1906, by Dr. Wil- 
liams on Duncan Island. 
Cotypes, 14 specimens, No. 452, Museum California Acad- 
emy of Sciences, and 12 specimens in author’s collection. 
