The ultrafast internal conversion (IQ dynamics of the apocarotenoid citranaxanthin have been studied for the first time by means of two-color transient lens (TL) pump-probe spectroscopy. After excitation into the high-energy edge of the S-2 band by a pump pulse at 400 nm, the subsequent intramolecular processes were probed at 800 nm. Experiments were performed in a variety of solvents at room temperature. Upper limits for the S-2 lifetime tau(2) on the order of 100-200 fs are estimated. The S-1 lifetime tau(1) varies only slightly between solvents (10-12 ps), and the only clear decrease is observed for methanol (8.5 ps). The findings are consistent with earlier results from transient absorption studies of other apocarotenoids and carotenoid ketones and transient lens experiments Of C-40 carbonyl carotenoids. Possible reasons for the observed weak solvent dependence of tau(1) for citranaxanthin are discussed.