182 
Psyche 
[December 
rather deeply and broadly concave, the sides feebly and evenly 
convex, the median longitudinal costa, or carina, extending 
back over the front and vertex, very pronounced. Eyes rather 
small, moderately convex, their anterior orbits just behind the 
median transverse diameter of the head. Mandibles large and 
broad, their external border rather straight in the middle, the 
terminal border with only three distinct large apical teeth, the 
more basal denticles appearing as mere undulations. Clypeus 
sharply carinate, its anterior border entire, broadly rounded and 
depressed; frontal area short and indistinct, with a median 
carina continuous with those of the clypeus and dorsal surface 
of the head; frontal carinse separated as in imhellis^ subparallel, 
scarcely reaching to the level of the anterior orbits, bordering a 
depressed area on each side for the accomodation of the antennse. 
Scapes of the latter reaching somewhat beyond the eyes; funi- 
cular joints 2-7 subequal, transverse but less so than in imhellis, 
the three terminal joints forming an indistinct club, the last 
joint somewhat longer than the two preceding subequal joints 
together. Thorax in profile feebly rounded above, slightly more 
convex and broadest in the region of the pronotum, which is 
transversely subrectangular, with distinctly dentate anterior 
corners, the teeth being nearly as long as the width of their 
bases. Promesonotal suture subangular, distinct but not strongly 
impressed; mesoepinotal suture obsolete. Mesonotum short, 
broader than long, somewhat semicircular. Epinotum with 
nearly straight base which is distinctly longer than the abrupt, 
slightly concave declivity, the lateral angles between the two 
surfaces forming stout, broad, rather acute and erect teeth. 
The declivity is longitudinally grooved in the middle but not 
rnarginate on the sides below. Petiolar node cuneate in profile, 
about one and one-half times as high as long, narrowed above, 
its summit produced in the middle as a short, stout, erect 
spine; seen from above the node is somewhat hexagonal, 
broader than long, the median transverse diameter correspond- 
ing Avith the narrowed, transA^erse summit. At the anteroventral 
end of the petiole there is an acute, backAvardly directed tooth. 
Postpetiole very large, longer than broad, narrowed in front, 
Avhere its anterior surface is abruptly truncated and concave, its 
