306 CALIFORNIA ACADEMY OF SCIENCES  [Proc. 47H Ser. 
and broadly excised occipital border, and rather convex dorsal 
surface, not truncated anteriorly. Eyes moderately large, flat, 
their anterior orbits at the median transverse diameter of the 
head. Mandibles rather small, convex, 4-toothed. Clypeus 
trapezoidal, longer than broad and distinctly broader in front 
than behind, rather flat, sharply carinate behind, with entire, 
feebly rounded anterior border. Frontal area very distinct, 
transverse, triangular. Frontal carinze rapidly diverging in 
front, subparallel behind. Frontal groove distinct but not very 
deeply impressed. Antennz slender, scapes not flattened, 
curved at the base, extending a little beyond the posterior cor- 
ners of the head. Thorax decidedly narrower than the head, 
laterally compressed behind, evenly arcuate above in profile, 
with distinct promesonotal and feeble mesoepinotal sutures. 
Pronotum somewhat broader than long, slightly convex, in- 
distinctly marginate in the humeral region; epinotum with dis- 
tinct base and declivity meeting at a very obtuse angle, the for- 
mer sloping and straight, the latter more abrupt, marginate on 
the sides and longitudinally concave in the middle. Petiole 
rather low and thick, not as high as the epinotum, narrower 
than the posterior end of the epinotum, flat behind, rather 
strongly and evenly convex in front, with blunt, rounded and 
entire superior border. Gaster somewhat larger than the head, 
elliptical, slightly flattened dorsoventrally. Legs moderately 
long, anterior femora somewhat enlarged. 
Subopaque ; mandibles, posterior corners of the head and legs 
more shining. Surface of body distinctly shagreened and with 
piligerous punctures, which are small and shallow on the head, 
coarser, deeper and sparser on the thorax and gaster, finer, 
sharper and more numerous on the mandibles. 
Hairs pale yellow, rather glistening, abundant, erect and 
rather long on the dorsal surface of the head, thorax, petiole 
and gaster, absent on the legs and antennz. Pubescence yel- 
lowish, short, very dilute, distinct and appressed on the sides 
of the head, slightly longer and subappressed on the legs, ex- 
tremely short and inconspicuous on the antennal scapes. 
Dull yellowish ferruginous, mandibles, petiole and gaster and 
in some specimens the epinotum or whole thorax, brown; tips 
of mandibles and their teeth blackish, legs paler and more yel- 
