1954] 
Creighton — Pseudo myrmex apache 
15 
there is a succession of different species of oaks from north 
to south along the Plateau and that these oaks by no means 
form a continuous belt throughout this region. There are 
many areas where the oaks are replaced by mesquite. It 
may be no more than a coincidence that apache accepts 
several species of oaks as well as mesquite as nest sites 
but, at least, this behavior is precisely what would be ex- 
pected if apache had migrated north along the Mexican 
Plateau. 
Literature Cited 
1. Creighton, W. S., Psyche, Vol. 59, No. 4, p. 141, December, 1952. 
2. Shreve, F., in Kearney and Peebles, U.S.D.A. Misc. Pub. No. 423, 
May 1942. 
3. LeSeiir, H., Univ. Texas Publication No. 4521, June 1945. 
4. Smith, H. V., Univ. Ariz. Agric. Exp. Sta. Bull. 197, July 1945. 
5. Creighton. AV. S.. Psyche. Vol. 59, No. 4.. p. 161, December 1952. 
