.--The name of Heterocnus cabanisi Heine (1859) has long been in use for the Mexican Tiger Heron. Unfortunately, it must be discarded because of the prior Tigrisoma rnexicana Swainson (1834). In Murray's 'Encyclopaedia of Geography,' the zoological portions of which are by Swainson, there appears the above name, accompanied by the unmistakable de- scription of an immature Heterocnus, together with an identifiable woodcut. Sherborn cites this name from the London (original) edition which I have not seen and which appeared in July, 1834. This was apparently issued in a single volume, while the two available American editions (Lea and Blanchard, Phil- adelphia, 1839 and 1841) are in three volumes, each paged separately. The two races of the Mexican Tiger Heron should therefore stand as: Heterocnus mexicanus mexicanus (Swainson) Tigrisorna rnexicana Swainson, in Murray's Encl. Geog.: 1383, 1834 [Am. ed., 3: 315, fig. 1034, 1839]--Real del Monte (Hidalgo), Mexico. Heterocnus mexicanus fremitus van Rossem and Hachisuka Heterocnus cabanist [sic] fremitus van Rossem and Hachisuka, Proc. Biol. Soc. Wash., 50: 161, Sept. 30, 1937--Guirocoba, Sonora, Mexico.--A. J. VAN RossrM, University of California, Los Angeles, California.