82 
Psyche 
[June 
it and the medial wall of a notch which receives the acute, 
triangular basal mandibular tooth. Anterior margin of 
clypeal apron set with twelve small, regular separated 
denticles which are truncate, subcylindrical and not sock- 
etted on snbconical tubercles as are those of pallipes and 
its subspecies, also one of these tubercles on each short 
lateral margin. This makes 14 denticles in all, more 
than in pallipes, all separate, smaller and more regular 
than in the pallipes complex, and with the exception of 
the tooth on each lateral margin, on approximately the 
same level. Eyes about the same size and in the same 
Figure 1. Awiblyopone ( Stigmatomma ) trigonignatha new species, 
worker, left mandible and anterior clypeal border. 
position as in medium-sized pallipes workers, with only 
3 or 4 of the facets actually pigmented in each. A faint 
median depression on the cephalic dorsum at about the 
midlength evidently represents a vestige of the anterior 
ocellus. 
Mandibles distinctive; considering only the basal 
halves each forming an obtuse triangle, with the inner 
border of the basal part just before the midlength dis- 
tinctly angulate at somewhat more than a right angle; 
this angle, which is capped by two massive, blunt double 
teeth partially fused at their bases, marks oft fairly 
distinct basal and apical borders. The basal border 
bears two rows of teeth, a dorsal and a ventral; there 
are two teeth in each row, the ventral ones triangular, 
