64 
Psyche 
[June 
antennal fossae. Mandibles armed with five prominent 
teeth which decrease in size from the apical tooth inward, 
and a single much smaller tooth at the angle between 
the masticatory margin and the inner margin. The anten- 
nal scape in repose reaches the level of the lateral ocellus. 
Base of the scape with a conspicuous flange. Frontal 
lobes rather narrow in front, only slightly divergent 
behind and not projecting much above the antennal fossae. 
Frontal area large and crossed by a single median ruga. 
Clypeus with five longitudinal rugae. Color, when alive, 
a deep, ferrugineous red which fades to an orange red 
as the specimen dries. 
Gynetype: a female from Arsarca Canyon, Chinati Moun- 
tains, Texas, in the writer’s collection. A second female 
from the Davis Mountains, Texas, agrees well with the 
type in the characters cited above. 
It seems worth commenting here on Wheeler’s original 
concept of the diagnostic features of the subgenus Ephe- 
bomyrmex. As his principal criterion for establishing the 
group Wheeler cited the absence of a beard or psam- 
mophore on the under surface of the head. In the figure 
of imberbiculus which accompanied the original descrip- 
tion of the worker of that species, (7) Wheeler made no 
attempt to depict the pilosity, either on the gula or else- 
where. But in the description he noted the presence of 
a group of erect hairs on the gula which did not form a 
“conspicuous” beard. In this stand Wheeler seems to 
have been influenced by Forel, who had set up a subgenus 
to receive the beardless species mayri (11). But the 
gular hairs of P. mayri are uniformly short and even 
those at the anterior edge of the gula do not project 
much beyond it. They cannot by any stretch of imagina- 
tion be said to form a psammophore. Unfortunately this 
is not the case with all the species of Ephebomyrmex. 
Oddly enough Wheeler’s two species imberbiculus and 
pima are the worst offenders in this respect. Each has 
a small, median psammophore on the anterior half of 
the gula which runs diagonally inward toward the mid- 
line of the head. It may be admitted that these groups 
