Hollister (Proc. Biol. Soc. Washington, 127:210, October 31, 1914) named _Cyclopes mexicanus_, on the basis of light-golden upper parts and large, especially broad, auditory bullae, as specifically distinct from _Cyclopes dorsalis_ Gray (= _Cyclopes tridactylus dorsalis_ Gray). Our comparisons and examination of the specimens used by Hollister and a few other specimens acquired since 1914 convince us that _C. mexicanus_ is taxonomically valid and that Hollister, in general, correctly indicated its diagnostic characters. Nevertheless, there is considerable evidence that _C. mexicanus_ is only subspecifically distinct from _C. dorsalis_. In the first place, an adult _C. dorsalis_, not seen by Hollister, from El Banco, Chiriquí, Panamá (No. 248343 USBS), has more inflated, although narrower, auditory bullae than do specimens of _C. mexicanus_. In the second place, the two specimens mentioned by Hollister (_loc. cit._) as from "Tabasco and southern Vera Cruz" actually are both from Tabasco (No. 100040 USBS from Teapa, and No. 100174 USBS from Montecristo). Each, as Hollister indicated, is darker on the upper parts than his other referred specimens (two others from Montecristo in Tabasco and another from El Salto in Chiapas). To us this suggests intergradation with _C. dorsalis_. Incidentally, the specimen that Hollister mentioned from Veracruz (No. 78111 USBS, from Minatitlan), and that he indicated as having dark upper parts, really has light upper parts. Third, a skin from Petén, Libertad, Guatemala (Harry Malleis field No. 504, immature female), that the late Major E. A. Goldman and one of us (Hall) once examined, has considerable dark brown on the chin, throat and midventral line, as well as a dark mid-dorsal stripe. The specimen is intermediate in color, as well as geographically, between _C. t. dorsalis_ and _C. mexicanus_, although referable to the latter. Taken together, the above evidence indicates subspecific status for the northern, Mexican, animal and we conclude that it should stand as _Cyclopes tridactylus mexicanus_ Hollister. _Transmitted July 1, 1952._