288 CALIFORNIA ACADEMY OF SCIENCES [Proc. 47H Serr. 
Head rather large, trapezoidal, decidedly broader behind 
than in front, excluding the mandibles a little longer than 
broad, very convex above, flat beneath, with feebly convex 
sides, feebly and broadly excised occipital border and a dis- 
tinct transverse impression on the cheeks. Eyes moderately 
large, flat, situated well behind the middle of the head. Man- 
dibles short, convex, 5-toothed. Clypeus subrectangular, as 
broad as long, a little broader in front than behind, convex 
but not carinate in the middle, transversely impressed just 
behind the anterior margin, which is feebly but distinctly 
excised in the middle and rather deeply emarginate on each 
side. Frontal area very small, distinct, triangular. Frontal 
carinze rapidly diverging in front, but parallel behind. An- 
tennal scapes stout, funiculi slender, the former flattened, 
curved and very narrow at their insertions, extending about one- 
quarter their length beyond the posterior corners of the head. 
Thorax a little longer than the latter, including the mandibles, 
laterally compressed behind, with flat pleurze; promesonotal 
and mesoépinotal sutures very sharp and distinctly impressed ; 
pronotum flat above, including the neck nearly as long as 
broad; mesonotum much narrower, flat, almost circular when 
seen from above, bluntly marginate on the sides; epinotum 
nearly as broad as the mesonotum, a little longer than broad, 
subcuboidal; in profile with the base a little longer than the 
declivity, both distinctly concave, the former horizontal, the 
latter sloping and separated by a sharp transverse ridge, which 
is slightly emarginate in the middle so that the apex of the 
epinotum viewed obliquely or from above is feebly bidentate. 
Petiole nearly as high as the epinotum, its superior margin 
blunt, broadly rounded and entire, its posterior surface flat, 
its anterior surface formed of two subequal planes meeting at 
an obtuse angle, the more ventral plane vertical and parallel 
with the posterior surface. Gaster rather large, elliptical; 
legs rather long and stout. 
Opaque; mandibles, gula and sides of head, occipital cor- 
ners, declivity of epinotum and sutures of thorax shining: 
Whole body very densely and finely punctate, the mandibles, 
cheeks, sides of head, antennal scapes, legs and gaster also 
with somewhat larger, sparser, shallow punctures which bear 
