112 
William Mortor Wheeler 
tending back to the middle of the anterior Orbits. Frontal area large, 
triangulär, indistinct. Frontal groove distinct but not extending to 
the anterior ocellus. Mandibles small, convex, triangulär, with 5 
short, blunt, subequal teeth. Antennse very short, 10-jointed, funiculi 
enlarged towards their tips but without a differentiated club. Palpi 
very short, the maxillary pair apparently 6-jointed. Thorax only 
about as long as the head including the mandibles, but narrower; 
prothorax much larger than the mesothorax and epinotum; metanotum 
well-developed, but very narrow; mesoepinotal constriction distinct. 
Petiole with a blunt, low, transverse node. Gasterlarge. Legs short; 
middle and hind tibise with very short, simple spurs; claws simple, 
well-developed. 
Frodimorphomyrmex primigenius, sp nov. 
Worker (Fig. 54). Length about 8 mm. 
Antennal scapes short, slightly incrassated at their tips, which 
do not reach to the posterior orbits; first funicular joint twice as 
long as broad, second joint small, about as broad as long, joints 3 and 
4 broader but not longer 
than the second, joints 7 — 8 
nearly as broad as long, ter- 
minal shorter than the two 
penultimate joints together. 
Pronotum as long as broad, 
with rounded, sloping hu- 
meri, twice as broad as the 
mesonotum, both together 
feebly and evenly convex in 
profile ; mesonotum seen 
from above longer than 
broad, broader in the front 
than behind, marked off 
from the small metanotum 
by a distinct suture, with 
Fig. 54. Prodimorphomyrmex primigenuis sp. nov. compressed sides. Epinotum 
Worker, 57. about as broad as long, 
broader behind than in front, 
rounded in profile, without a distinct base and declivity. Petiole 
small, a little broader than long, its node low, compressed antero- 
posteriorly, slightly inclined forward, its anterior and posterior surfaces 
rather flat, its border rather blunt and entire. 
