28 
William Morton Wheeler 
Carina parallel with the frontal carina, but shorter. Eyes large, round, 
convex, consisting of many minute ommatidia. Antennse short, 
12-jointed, scape thickened distally, funiculus not ending in a one- 
jointed club, the last being shorter than the two preceding joints toge- 
ther. Thorax rather short, cylindrical, with out promesonotal or meso- 
epinotal sutures or depressions. Petiole stout, barrel-shaped, with a 
prominent, compressed anteroventral tooth. Postpetiole much larger 
than the petiole, separated by a pronounced constriction behind from 
the gaster. The latter is short and compact, without constrictions 
between the segments; its first segment longer and broader than the 
petiole, remaining segments very short, convex above and apparently 
somewhat deflected. Legs rather stout; all the tibise with well-developed, 
pectinated spurs. Genotype: P. annosus sp. nov. 
Procerapachys differs from Cerapachys in the structure of the 
antennse, which do not terminate in a one-jointed, glandiform club, 
and have longer and more uniform joints, much as in certain species 
of Eciton. From Sphinctomyrmex it differs in the structure of the 
abdomen which is much shorter and not constricted behind each segment. 
From Lioponera it differs in its heavy sculpture. In most of these 
characters and in the rather large size of the species, the new genus 
is of a more primitive type than its modern representatives. Its 
occurrence in the amber is of great interest because it shows that the 
Cerapachyini , now confined to the tropics and most abundantly re- 
presented in the Indian and Australian regions, had a much wider 
distribution during Oligocene times. 
Procerapachys annosus, sp. nov. 
Worker (Fig. 2a and b). Length 6 — 7,5 mm. 
Head, excluding the mandibles, slightly longer than broad, a little 
broader behind than in front, with rather straight, subparallel sides, 
and, when seen from the front, with straight posterior border; seen 
from above the occipital border is broadly excised and on each side 
of it the head has a bluntly angular projection. Antennal scapes 
reaching to the eyes; joints 1 — 10 of the funiculus somewhat broader 
than long, terminal joint rather pointed, a little longer than broad. 
Ocelli sometimes present. Thorax cylindrical, slightly constricted behind 
and convex in the pleural region, a little more than twice as long as 
broad, slightly narrower than the head. Pronotum with a prominent 
transverse ridge behind the very concave neck. A similar ridge forms 
a border to the whole epinotal declivity, which is very flat and abrupt. 
