Dufour's gland triglycerides from Anthophora, emphoropsis (Anthophoridae) and Megachile (Megachilidae) bees (Hymenoptera: Apoidea).

Lipids secreted from the Dufour's glands of the bees Anthophora centriformis, Anthophora californica tarsata, Emphoropsis miserabilis, Megachile (Delomegachile) gemula, M. (Phaenosarus) fortis, M. (Argyropile) parallela, and M. (Melanosarus) xylocopoides primarily consist of short chain (C2-C20) fatty acid triglycerides. Nearly 95% of the triglycerides from Anthophora and Emphoropsis have one palmitoyl-, stearoyl- or arachidoyl moiety, plus two shorter acids (C2-C16). Virtually all triglycerides (98%) from the four Megachile species possess only short-chain fatty acids (C2-C16), often with one like pair of acids.