Vor. II, Pr. 11] WHEELER—GALAPAGOS ISLANDS ANTS 297 
36. Camponotus (Myrmorhachis) planus pinzonensis, 
new variety. 
Worker major. Length 6.5—7 mm. 
Very similar to the preceding variety and with the same 
kind of pubescence on the gaster, but the pubescence on the 
head, thorax, scapes and legs is more abundant though not 
longer. The base and declivity of the epinotum are subequal 
in profile and the former is perfectly straight and horizontal, 
the latter straight above; the ridge separating them is trans- 
verse and entire, without any indications of teeth. 
Worker minor. Length 3.5—4.5 mm. 
Very similar to the worker major, but the epinotum has the 
base feebly concave and bidentate behind. 
Female. Length 7.5—8 mm., wings 8.5 mm. 
Smaller than the female of the typical planus, with the 
pubescence of the gaster precisely the same as in the worker. 
The superior border of the petiole is distinctly emarginate in 
the middle. The pronotum and paraptera are tinged with 
ferruginous red and the legs and antennz are more yellowish 
than in the worker. The head and body are more distinctly 
shagreened and much less shining than in the typical planus. 
Described from five major workers, three minor workers and 
six females taken by Dr. Williams, August 13-14, 1906, on 
Duncan Island. 
Cotypes, 6 specimens, No. 460, Museum California Acad- 
emy of Sciences, and 8 specimens in author’s collection. 
