Vot. II, Pr. IT] WHEELER—GALAPAGOS ISLANDS ANTS 279 
as Smith was notoriously careless in making identifications 
even of his own species, its inclusion among the Galapagos 
ant fauna must be regarded as doubtful. 
19. Camponotus (Myrmamblys) macilentus F. Smith. 
Camponotus macilentus F. Smith, Proc. Zool. Soc. London, 
1877; p) 83/8" 
Smith described this species very briefly from worker speci- 
mens taken by Charles Darwin on Charles Island as follows: 
“Worker. Length, 2% lines. Pale ferruginous, with the 
legs pale testaceous, smooth and shining, and having a few 
scattered pale hairs. The head wider than the thorax, oblong, 
with the eyes large, ovate and black; the vertex slightly 
emarginate behind. Thorax compressed and much narrowed 
behind, convex above. Abdomen wider than the head, and 
oblong ovate. The scale of the petiole wedge-shaped and 
rounded above.” | 
I have not seen specimens of this ant from Charles Island, 
but I have before me a number of specimens from many of 
the other islands and these specimens differ varietally accord- 
ing to their localities. Hence I am compelled to describe in 
detail the form from James Island, which is represented by 
the most complete series, as if it were the specific type and to 
compare with it the several other varieties. I assume that 
when the type from Charles Island is again collected, it will 
prove to differ at least as much from the other forms as these 
differ from each other. From the fact that Smith says noth- 
ing about the color of the abdomen of his specimen, I infer 
that it was probably without dark markings like the variety 
which I call hoodensis. 
The following varieties show that C. macilentus, which has 
remained unknown to myrmecologists since it was described 
by Smith and has been placed by Forel among the Camponoti 
mcerte sedis, is a true Myrmamblys, rather closely related to 
C. claviscapus Forel, a species widely distributed in Central 
America, Brazil and the West Indies. C. claviscapus, how- 
ever, is smaller and the worker major has a much more 
sharply rectangular head, with flattened and strongly and 
abruptly incrassated tips to the antennal scapes. This species 
