A mixture of compounds was found in the metasternal gland of a local stink bug, Helopeltis fasciaticollis Poppius (Hemiptera: Miridae). Seventeen components in the mixture were identified by gas chromatography/mass spectrometry (GC/MS) as belonging to different chemical groups: carboxylic acids, aliphatic esters, aliphatic alcohols, and aliphatic aldehydes. The three major compounds which comprised almost 95% of the secretion were acetic acid, 2-octenal, and octyl acetate.