1964] 
Creighton — Habits of Pheidole 
173 
in Deep Canyon. Dr. Evert Schlinger of the Entomology Division 
of the Citrus Research Station has written me that he has taken 
several colonies of clydei at higher elevations there. Few xerophilic 
ants possess such a large elevational tolerance, but those which can 
equal it or come anywhere near it are commonly encountered over 
large areas. This suggests that clydei may be much more abundant 
than has been supposed and that its “rarity” is mainly the result of 
an unusual nesting habit which has kept it out of the hands of 
collectors. 
Literature Cited 
1. Gregg, R. E. Jour. N. Y. Ent. Soc., Vol. 58, p. 89-93, 1950 
2. Gregg, R. E. Amer. Mus. Novitates, No. 1637, p. 4-7, 1953 
3. Creighton W. S., and R. E. Gregg, Univ. of Colo. Studies, No. 3, p. 36, 
1955 
