Novel Alkaloids from the Poison Glands of Ants Leptothoracini Novel pyrrolidine alkaloids were isolated from the poison glands of ants Leptothoracini(Myrmicinae) and identified as a mixture of N‐alkylated 3‐methylpyrrolidines. The females of these species produce male‐attracting pheromones in their poison glands. The basic compounds in the secretions were found to be active. The major alkaloid, 3‐methyl‐1‐(3‐methylbutyl)pyrrolidine (5), is present in only ng quantities per gland. Copyright © 1995 Verlag GmbH & Co. KGaA, Weinheim