162 
Psyche 
[December 
trunk measured from lateral view. The most useful indices 
are: ci, cephalic index, head width/ hl x 100; Mi, mandib- 
ulo-cephalic index, ml/hl X 100. 
Strumigenys ulcerosa new species 
Holotype ivorker: TL 4.10, HL 1.09, ml 0.55, WL 1.16 mm. ; 
Cl 71, MI 50. Occipital lobes surpass indistinct anterior 
pronotal margin by approximately 0.1 mm.; this overlap 
not included in TL. 
In general habitus resembling Emery’s figure of S. doriae 
(see below), but the mandibles longer and much broader, 
and the head less broad behind, assuming that Emery’s 
figure approaches the correct proportions for doriae. Sides 
of head in front of occipital lobes feebly concave in outline; 
eyes moderate in size and convexity, situated distinctly 
anterior to the cephalic midlength, visible in dorsal view. 
Clypeus triangular, the anterior border weakly depressed 
and very feebly concave. Seen from the side, the deepest 
part of the head is reached at the highest point of the con- 
vex vertex, slightly posterior to cephalic midlength; oc- 
cipital lobes only about half as deep, strongly depressed. 
Scape L 0.68, funiculus L 0.85 (segment v 0.40, iv 0.24, 
III + n 0.10, I 0.11 mm.). 
Mandibles approximately straight, depressed, broad 
(slightly less broad than in S. bryanti holotype), at bases 
slightly narrowed and feebly bent inward, broadest at 
about the apical quarter. Just before the apical fork, the 
inner border becomes very feebly concave, but there is no 
preapical angle marking off this concavity, and there is no 
preapical tooth or denticle. Dorsal tooth of apical fork 
stoutly spiniform, L 0.14-0.15 mm., only slightly longer than 
the ventral tooth, which is blunter and approximately paral- 
lel ; no trace of any intercalary tooth or denticle. 
Alitrunk slender, pronotum narrowly rounded anteriorly, 
without humeral angles, but with a low tubercle on each 
side; anterior pronotal border obsolete. Pronotum with the 
entire mesonotum forming one continuous gently arching 
profile as seen from the side, sloping posteriorly to the 
well-marked metanotal groove. Propodeal dorsum sloping 
down posteriorly from the groove, only very feebly convex. 
Mesosternal groove very broad and deep, taking up ap- 
