1926] 
Some New Neotropical Ants 
105 
head. Pronotal humeri with lamellate spines, postpetiole very 
large and broad. Clypeus, scrobes, posterior border of head, 
anterior border of thorax, sides of epinotum, upper and lower 
surfaces of petiole and lower surface of postpetiole with broad, 
thin, semitransparent lamellae. 
Genotype . — Strumigenys ( Tingimyrmex ) mirabilis, new spe- 
cies. 
Strumigenys (Tingimyrmex) mirabilis, new species (Fig. 1). 
Worker . — Length 2 . 25 mm. 
Head, excluding mandibles, nearly two times as long as 
broad and about twice as broad at occiput as in front, sides 
posterior to eyes nearly straight and parallel, in front of eyes 
convergent, then very feebly sinuate and slightly divergent to 
anterior border; occipital corners angulate, border shallowly 
emarginate; vertex rather strongly convex. Clypeus broadly 
convex, arcuate at anterior border. Mandibles a little more than 
