24 
Psyche 
[March 
spines short and triangular, but sharp. Scapes reach to 
the occipital corners of the head. Gaster glabrous and 
shining. Color of entire body dark brown, legs and anten- 
nae light brown. 
Female : Length, 5.25 mm.; head index, 1.0; head length, 
1.10 mm.; thorax length, 1.58 mm. 
Resembles soldier in most respects, but differs from that 
caste in the following ways. Body size larger, head quad- 
rate, frontal area level with the general surface of the 
head (not depressed), compound eyes large and occupying 
a proportionately greater area on the sides of the head, 
vertex with three prominent ocelli, occipital lobes are not 
as pronounced and the furrow is shallower, scapes reach 
approximately half way from their insertions to the corners 
of the lobes, and the mandibular teeth are sharper and 
more distinct. Entire dorsal and lateral surfaces of the 
head covered with rugae which are longitudinal on the 
frons and genae, but curve to parallel the occipital lobes, 
bend centrally and become transverse on the occiput and 
in the furrow. Interrugal sculpture consists of fine striae, 
granules, and large dimples or foveae. Surface shining 
despite the sculpture but less so than in the soldier. 
Thorax flat except where mesonotum descends abruptly 
to the pronotum ; dorsum of pronotum, mesonotum, and 
metanotum shining and smooth except for piligerous 
punctures; propleurae and epinotal pleurae with parallel 
rugulose sculpture, subopaque; epinotal base rugulose, 
declivity smooth ; epinotal spines short, conical, and half 
as long as their interbasal distance. Petiole and postpetiole 
like those of the soldier, opaque; lateral conules of the 
postpetiole very prominent and bluntly rounded at the 
tips. Gaster sharply truncate at the base, anterior margin 
straight. Wings transparent, stigma pale brown, one discal 
cell. Head and mandibles reddish brown, thorax darker, 
gaster dark brown, legs and antennae light brown. 
Male: Length, 4.08 mm.; head index, 1.14; head length, 
0.58 mm. ; thorax length, 1.58 mm. 
Explanation of Plate 3 
Pheidole creightoni, a female (dealate) ; b. male; c. head of male. 
All figures are drawn to the same scale. 
