292 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH SER. 
insertions of the mandibles. The eyes are very close to the 
occipital border, from which they are separated by a space 
less than half the length of an eye. This character is found 
also in the minor worker of C. quadrilaterus. ‘The clypeus is 
broadly rounded in front, with a very blunt, median carina. 
The antennz are long, the scapes surpass the occipital border 
by more than one-third their length. ‘The thorax is rather 
slender (total length 1.9 mm., width of pronotum 0.9 mm.), 
with the sutures well-marked but not impressed, the dorsum 
depressed, bordered by obtuse ridges. The epinotum is nar- 
rowed posteriorly, where it is sharply truncated, the base 
rising a little at its posterior end and nearly in the form of a 
right angle with the declivity, which is concave longi- 
tudinally; the ridge separating the two surfaces is very feebly 
notched, so that if the insect is viewed obliquely from the 
side, the epinotal base seems to terminate on each side in a 
pointed projection. The petiolar scale is truncated behind, 
i. e. its posterior surface is flat and vertical when viewed in 
profile; it forms a very sharp and feebly rounded angle with 
the anterodorsal surface; the anterior and dorsal surfaces 
form a very obtuse angle. 
“The head and thorax are opaque and covered above with 
very fine and dense thimble-punctures ; the inferior surface of 
the head is shining; the sides of the thorax are a little less 
opaque than the dorsum and covered with coarser punctures ; 
the epinotal declivity is rather shining and irregularly and 
transversely rugose. The mandibles and appendages are 
opaque and covered with exceedingly fine and dense punc- 
tures. The anterodorsal surface of the petiole has a sculpture 
very much like that of the thorax, but the punctures tend to 
flow together to form transverse strie. This transverse con- 
fluence is even more pronounced on the gaster, the sculpture 
of which is almost completely concealed by the ashen, slightly 
bronzy pubescence which forms a pelt. The pubescence of 
the head and thorax is composed of short, scattered hairs. 
The coxe are finely and densely pubescent. There are rather 
numerous, erect, yellowish hairs on the thorax and gaster, 
shorter and sparser on the front. 
“Perhaps this ant is not specifically different from C. planus 
F. Smith, to which it seems to be very closely related. The 
