66 
Psyche 
[June 
turn. Instead its rather thin rear edge forms, with the 
metanotum and the basal face of the epinotum, a single, 
sloping declivity which is broken only by the sutures at 
either side of the metanotum (see figure). In all species 
belonging to the subgenus Pogonomyrmex where the 
writer has been able to examine the female ( apache , 
badius, barbatus, calif ornicus , huachucanus , occidentalis 
and subdentatus) , the scutellum rises well above the 
metanotum. This rise is usually abrupt and sometimes 
the rear face of the scutellum overhangs the metanotum. 
There is thus a break in the outline of the thorax at the 
metanotum and the dorsum of the scutellum is always 
at a level well above that of the metanotum or the anterior 
edge of the epinotum. As to whether these distinctions 
will hold uniformly through both subgenera remains to 
be seen, but if they do there should be less difficulty in 
defending the status of Ephebomyrmex as a valid sub- 
genus. 
Literature Cited 
1. Wheeler, W. M. Jour. N.Y. Soc. Vol. 17, p. 80 (1909) 
2. Olsen, O. W. Bull. Mus. Comp. Zool. Harvard, Vol. 77, No. 8, 
p. 514 (1934) 
3. Creighton, W. S. Ibid. Vol. 104, p. 132 (1950) 
4. Smith, M. R. Bull. Brooklyn Ent. Soc. Vol. 48, No. 5, p. 131 (1953) 
5. Shreve, F. Carnegie Inst. Wash. Publication 591, p. 4 et seq. 
(1951) 
6. Creighton, W. S. Psyche Vol. 62, No. 3, p. 89-97 (1955) 
7. Wheeler, W. M. Amer. Naturalist, Vol. 36, No. 422, p. 89-90 (1902) 
8. Wheeler, W. M. Psyche, Vol. 9, p. 388 (1902) 
9. Wheeler, W. M. Ants, Columbia Univ. Press, p. 288 (1910) 
10. Cole, A. C. Jour. Tenn. Acad. Sci. Vol. 29, No. 4, p. 268 (1954) 
11. Forel, A. Biologia Centrali-Americana, Hymenop. Vol. 3, p. 61 
(1899) 
12. Emery, C. in Wytsmann Gen. Insectorum, Fasc. 174, p. 45 (1921) 
13. Wheeler, W. M. Psyche, Vol. 24, No. 6, p. 178 (1917) 
