98 
Psyche 
[September 
and shallow punctures which are visible only at high mag- 
nifications. 
Erect hairs yellow or whitish yellow, present on the 
clypeus, the gula, the space between the occipital angles and 
the posterior border of the eye and the ocellar triangle. 
Hairs on the mandibles much finer than those on the rest 
of the head. Erect hairs very sparse or absent over most of 
the thorax. Those on the scutum very short. A cluster of 
somewhat longer hairs is present on the scutellum. Petiole 
without erect hairs. Postpetiole with about six long hairs 
on its posterior dorsal surface and a few shorter ones on 
the ventral surface. Erect hairs evenly spaced over the 
entire gaster. Hairs on the legs for the most part very fine 
and completely appressed. A few erect hairs on the fore 
coxae and fore femora. Antennal scapes and the first 
eight funicular segments evenly covered with fine, semi- 
erect hairs which grade into pubescence on the last four 
segments. 
Mandibles clear yellow ; clypeus, antennae and legs 
yellow, infuscated very lightly and somewhat unevenly 
with brown. Head, except for the appendages, blackish 
brown. Thorax brownish yellow except for the scutum 
which is clear brown. Petiole, postpetiole and gaster 
brownish yellow. Wings as in the female. 
The additional material of huachucana has brought up 
some points which should be mentioned here. The peculiar, 
narrowed rear of the head which is very apparent in the 
worker types (Plate 7, fig. 4) is not a uniform character. 
A number of workers of huachucana show a greater degree 
of convexity in the part of the head which lies between the 
occipital flange and the rear of the eye. Such workers ap- 
proach texana closely in head shape. There is also consider- 
able variation in the shape of the epinotal spines, although 
these spines in huachucoma are never as thin and delicate 
as they are in texoMa. On the other hand, all the workers 
of huachucana which the writer has seen differ from those 
of texana in their larger size, their heavier and more rugose 
sculpture, in the more abruptly elevated rear edge of the 
mesonotum and in the prominent, triangular lobe at the 
base of the scape. These features seem to be thoroughly 
