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Terpenoid constituents have been isolated from the following Iridomyrmex ants. The known methylheptenone (11) and iridodial, a novel dialdehyde (C10H16O2), have been extracted from Iridomyrmex detectus (F.Sm.) and from I. conifer ((Forel). I. nitidus (Mayr.) has yielded iridolactone (C10H16O2). Iridodial is converted into iridolactone by the action of alkali. The isolation of iridomyrmecin (a lactone, C10H16O2) from I. humilis (Mayr.) confirms the original observation of Pavan (1949).

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Abstraet--(Z)-9-Hexadecenal (I), 13-(1-methylpropyl)tridecanolide (II), and (Z)-10-nonadecene-2-one (IV) have been characterized from a lipid fraction of the total extract of I. humilis. Glycerides of normal fatty acids constitute the bulk of the lipid fraction. Compound I, a general aggregation factor ofL humilis, is a constituent of the ventral gland secretion. Actinidine has been characterized from the pyrazine-containing fraction of the total extract.