Summary
When disturbed, two species of Malayan Pachycondyla release foam threads more than 10 cm in length or foam piles. The source of the proteinaceous foam is the enlarged venom gland, which is probably frothed up by air from the spiracles of the spiracular plates. The Dufour's gland normally producing hydrocarbons in stinging ants is atrophied. Therefore, absence of the Dufour's gland could be essential to the foaming ability, since the lipophilic hydrocarbons inhibit froth production in protein solutions. The release of foam is a mechanically acting defense mechanism, which is very effective against small mass-attacking ants. Pachycondyla species are also able to sting effectively.
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Maschwitz, U., Jessen, K. & Maschwitz, E. Foaming in Pachycondyla: A new defense mechanism in ants. Behav Ecol Sociobiol 9, 79–81 (1981). https://doi.org/10.1007/BF00299857
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DOI: https://doi.org/10.1007/BF00299857