1052] 
Creighton — Camponotus papago 
153 
with this last point it seems worth noting that in the ten 
colonies on which this study was based there were 23 fe- 
males, 2 males, 104 major workers and 194 minor workers. 
These totals do not include 20 additional females taken 
at light. 
There follows the description of the above material : 
Camponotus (Colobopsis) papago sp. nov. 
Major worker: head 1.06 mm., thorax and petiole 1.5 
mm., overall length 4.5 mm. (Plate 13, figure 3) 
Truncated portion of the head distinctly concave, with 
a low, serrate flange bordering either cheek but not con- 
tinued across the top of the clypeus. The entire clypeus 
raised slightly above the level of the adjacent portions 
of the cheeks, which slope downward to the clypeus from 
the bordering flange. Sculpture of the truncated portion 
of the head consisting of coarse, irregular ridges which 
form reticulations. These reticulations and the areas 
which they surround, are covered with numerous, very 
fine, crater-like punctures. These punctures do not dull 
the shining surface. Sculpture on the mandibles rough 
but not distinctly reticulate. Seen from above the frontal 
lobes are covered with even reticulations which surround 
circular or nearly circular depressions. This reticulate 
sculpture extends almost to the level of the single median 
ocellus, with the depressions becoming shallower and more 
widely spaced towards the rear. The rear third of the 
head is finely shagreened and notably more shining, par- 
ticularly at the occipital corners, than is the heavily sculp- 
tured front of the head. The reticulation on that part of 
the clypeus which lies behind the truncation is much less 
even than that on the frontal lobes. Reticulation on the 
cheeks less even and somewhat coarser than that on the 
frontal lobes. The entire anterior half of the head with 
the same fine, crater-like punctures which occur on the 
truncated portion. A very feeble frontal furrow is visible 
in certain lights. Antennal scapes rather strongly shin- 
ing with small, white, appressed hairs. Hairs on the trun- 
cated portion of the clypeus and on the front face of the 
mandibles very strongly clubbed and shaped like tear drops. 
Hairs along the outer border of the mandibles, on the 
