1945] Two New Forms of Monomorium 67 
The epinotum is transversely striated over its complete upper 
and lateral surfaces, contrary to that of the type; the angle 
between the base and the declivity is more pronounced, and the 
whole structure is longer and higher. Slight tubercles are pres- 
ent in the positions usual for epinotal spines. Surface somewhat 
less shining than in minimum , especially the head which is al- 
most opaque. Hairs slender and abundant on all parts, but 
longer on the gaster. Color dark brown instead of black; an- 
tennae and legs lighter, with tibiae and tarsi yellowish. 
Described from one queen and numerous workers taken by 
Dr. A. E. Emerson in April, 1937 at Globe, Arizona, and the 
writer derives pleasure in naming this ant after his former 
teacher. The nest was under a stone at an elevation of 6,300 
feet. Two additional colonies of the species, each with a def- 
lated female, were collected by Dr. Emerson, the one at Austin 
and the other at San Marcos, Texas, and these seem to be iden- 
tical with the types from Arizona. 
Cotypes: in the author’s collection (1 queen and 79 workers). 
Paratypes: in the author’s collection and the U. S. National 
Museum. 
Both Monomorium minimum subsp. emersoni and M. penin- 
sulatum can be distinguished readily from M. minimum subsp. 
ergatogyna Wheeler from Santa Catalina Island, California, and 
the subspecies cyaneum and compressum Wheeler from Hidalgo, 
Mexico, as well as the European M. minutum Mayr, by the fact 
that the females are winged while those of the latter are wingless 
and ergatoid as far as observed (Wheeler 1914). The bluish 
black color of peninsulatum might lead to confusion with cya- 
neum, but the apterous condition of the latter makes the distinc- 
tion possible, and also their wide geographic separation lends 
support to this judgment. From M. carbonarium F. Smith and 
its subspecies ebeninum Forel, all of the above species may be 
differentiated by the rounded shape of the epinotum and the 
superior border of the petiolar node, as these structures are 
angular and the node has the upper surface weakly notched in 
the former insects. 
References 
1943. Brown, W. L. A new metallic ant from the pine barrens of New Jersey. 
Ent. News 54:243-248. 
1944. Smith, M. R. Additional ants recorded from Florida with descriptions of 
two new subspecies. Florida Entom. 27:14-17. 
