1955] 
Wilson and Brown — Formica 
129 
our own present paper), and most of the morphological 
observations bearing on species-group affinities are iden- 
tical, even though independently accomplished. Dr. Buren 
has graciously deferred to us in the mention of a few 
points discovered by himself where these are necessary 
to a clear understanding of the group affinities of the 
species treated below, and for this we are most grateful. 
It is inconvenient for us to indicate in the text all points 
that should be credited in whole or part to Buren’s original 
work, but it can be emphasized that his contribution was 
indeed an important one. Treatment of species within the 
sanguinea group, however, is entirely original with us. 
We have also consulted for purposes of this study Dr. 
A. C. Cole, Mr. P. B. Kannowski, and Dr. Mary Talbot 
(all of whom also furnished important series), Dr. W. S. 
Creighton, Dr. R. E. Gregg and Dr. M. R. Smith. We 
thank these workers for their criticisms and information. 
Literature Cited 
Creighton, W. S. 
1950. The ants of North America. Bull. Mus. Comp. Zool. Harv., 
104: 1-585, 57 pis. 
Wheeler, W. M. 
1913. A revision of the ants of the genus Formica (Linne) Mayr. 
Bull. Mus. Comp. Zool. Harv., 53: 379-565. 
Wilson, E. 0. 
1955. A monographic revision of the ant genus Lasius. Bull. Mus. 
Comp. Zool. Harv., 113: 1-201. 
