Too late for correction, I find that in my recent paper on western Orthoptera* I have redescribed Scudder's Aulocara rufum as a new species under the name guanieri, placing it in the not very nearly related genus Heliastus. This unfortunate mistake was brought about by the uncertain position of the genus Aulocara, which possesses both tryxaline and Œdepodine characters. The generral aspect of the species of the genus is certainly very strongly œdipodinean and the characters of the declivate vertex, subperpendicular front, filiform antennæ, small round eyes, obsolete lateral carinæ, twice or thrice severed median carina, wrinkled pronotum, and of the generally present intercalary vein, all indicate close affinity to the Œdipodinæ.