20 
Psyche 
[March 
mesoepinotal suture; suture deep but narrow; epinotal 
spines projecting upward and outward, blunt, about one- 
half as long as the distance separating their bases. Petiolar 
peduncle long, node narrow in the antero-posterior direc- 
tion and shallowly emarginate on the crest. Postpetiole 
twice as wide as the petiole, lenticular in shape from above 
as a result of pronounced lateral conules which are convex 
anteriorly and concave posteriorly. 
Abdomen elliptical and somewhat depressed ; of the shape 
usually characteristic for the genus. 
Sculpture: Pronounced transverse rugae on the occiput, 
extending into and across the cephalic furrow, but fading 
out on the vertex; finer, longitudinal rugae on the frons, 
anterior surfaces of the genae, and on the clypeus; inter- 
rugal striations and granules very fine, so that the sculp- 
tured areas of the head are shining; non-sculptured regions 
(vertex, gula, and frontal area) are exceedingly smooth 
and shining; mandibles striate and shining. Thorax 
glabrous and shining except the granular mesopleurae and 
epinotal pleurae; basal face of the epinotum between the 
spines for the most part smooth ; mesoepinotal suture 
cross-striate. Petiole and postpetiole finely granular, almost 
smooth. Gaster smooth and shining. 
Pilosity: Head, thorax, petiole, postpetiole, gaster, legs, 
funiculi, and scapes covered with long, finely pointed hairs 
of varying length. 
Color : Head yellowish red, mandibles brown, thorax 
brownish red, gaster dark brown, legs and antennae light 
brown. 
Worker: Length, 2.08 mm.; head index, 0.86; head length, 
0.58 mm. ; thorax length, 0.67 mm. 
Head subquadrate, occipital border slightly emarginate. 
Genae striate between eyes and mandibular insertions, 
otherwise smooth and shining. Thorax smooth and shining 
except mesopleurae and the dorsum and sides of the 
epinotum which are granular; interspinal space and dec- 
livity smooth. Petiole and postpetiole shagreened. Epinotal 
Explanation of Plate 2 
Pheidole creightoni, a. soldier; b. head of soldier; c. worker. All 
figures are drawn to the same scale. 
