The chemistry and biology of the ant venom alkaloids from the genera Solenopsis and Monomorium are briefly reviewed. The usual 2,6-dialkylpiperidines found in four as yet unstudied species of Solenopsis are described. In addition, a monoalkylated 1-piperideine, that is a new natural product, is described from a fifth Solenopsis species. Finally, the venoms of Monomorium latinode and M. subopacum are shown to contain an array of 2,5-dialkylpyrrolidines. © 1982.