Four triterpenes have been isolated from the fruits of Cabrakn polyrricha A.Juss. (Mehaceae). Two of them are new Cs, compounds whose structures have been established as the C-3, C-24 epimer of ocotillol-II and the C-24 epimer of ocotillone-II: 20s. 24Sepoxydammaranc-3x,25dioi (Ha) and the corresponding 3-keto compound (IVa). The otha two are the synthetically known trisnorlactone of Mills and the corresponding 3a-hydroxy compound (also new), that is, 25,26,27-trisnor-#)~hydroxy-3-oxodammarane-24-ic acid 20,241actone (VII) and 25.26,27-trisnor-3&?0~hydroxydammarane-24-oic acid 20.24htctone (Via).