186 
Psyche 
[December 
together form a distinct club whose maximum diameter is 
about three times that of the preceding joints. Eyes oval, 
moderately convex, set at the middle of the side of the head. 
Thorax in profile with the promesonotum rather feebly 
convex, the promesonotal suture not impressed. Mesoepi- 
notal suture prominent but with a shallow impression on the 
thoracic dorsum which is principally due to the elevated 
anterior edge of the epinotum since the posterior face of the 
mesonotum slopes directly to the suture without any im- 
pression. Epinotum in profile with a very feebly convex 
basal face which passes to the shorter declivious face 
through a poorly marked and very wide angle. In some 
specimens the angle between the two faces is virtually elim- 
inated so that the profile of the epinotum is a single, convex, 
descending slope. Seen from above the promesonotum is 
pyriform and only a little wider than the subpentagonal 
epinotum. The sides of the thorax are only slightly con- 
stricted at the mesoepinotal suture. 
Petiole seen in profile with a node which is very low, 
broadly and evenly convex above and without sharp transi- 
tions to the anterior or posterior peduncles. The ventral 
tooth on the anterior peduncle is very variable in character, 
In some specimens it is reduced to an angle, in others it has 
the form of a blunt, short tooth, in still others it is a very 
long and slender recurved spine. Dorsum of the postpetiole in 
profile with a long, sloping, feebly convex anterior face and 
a very short vertical posterior face. Ventral surface of the 
postpetiole in profile evenly convex. Seen from above the pe- 
tiole is narrow and spindle shaped with the anterior peduncle 
slightly thinner than the posterior peduncle. The post- 
petiole has the form of a truncated cone with the sides con- 
vex. It is a little less than twice as wide as the node of the 
petiole. 
Gaster bulky, oval. 
The sculpture of this insect, particularly that of the head, 
shows considerable variation. In some specimens the entire 
head is covered with fine, longitudinal striae. The more 
