Upon seeing numerous living individuals of _Leptodactylus melanonotus_ from many parts of its range in México and individuals of the population of _Leptodactylus_ in northwestern México (Nayarit and Sinaloa), I was immediately impressed not so much by the differences in the development of the ventral glands, but by the color of the glands. The differences in color are apparent in freshly preserved specimens. With the exception of _Leptodactylus_ from northwestern México, specimens of _melanonotus_ from throughout México and northern Central America have yellow or yellowish brown glands. Specimens from northwestern México have black or brownish black glands that are conspicuously darker than those found in _melanonotus_. Examination of 653 preserved specimens of _Leptodactylus melanonotus_ from México and Guatemala has failed to reveal specimens with black ventral glands, like those found in specimens from northwestern México, to which the name _Leptodactylus occidentalis_ has been applied. Furthermore, in _melanonotus_ the glands are less distinct and more extensive than in _occidentalis_; in the latter species glands are absent from the throat and midventral area, where they often are present in _melanonotus_ (Fig. 7). In some individuals of both species collected in the dry season and in some collected in the rainy (breeding) season the glands are absent; the development of these glands, therefore, does not seem to be correlated with breeding. Likewise, the glands are present or absent in either sex, and often as not they are present in juveniles. Presence of the glands, therefore, cannot be correlated either with sexual or ontogenetic development. Since the glands are found in individuals from all parts of the range, it is unlikely that there is a correlation between the development of the glands and the environment. [Illustration: FIG. 7. Diagrammatic view of ventral surfaces of _Leptodactylus melanonotus_ (A) and _Leptodactylus occidentalis_ (B), showing usual position and size of glandular areas. Approx. natural size.]