Browse Duellman; William E.

A Taxonomic Study of the Middle American Snake

As a part of a study of the herpetofauna of the Mexican state of Michoacán an attempt was made to ascertain the interspecific and intraspecific relationships of the various populations of _Pituophis_ there. Field work in Michoacán revealed that two supposed subspecies of _Pituophis deppei_ were sympatric. This discovery led to the examination of all […]

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Systematic Status of the Colubrid Snake

Systematic Status of the Colubrid Snake, Leptodeira discolor Gunther by Duellman At the time of completing my study of the genus _Leptodeira_ (1958) I had seen no specimens of _Leptodeira discolor_, a species described by Günther in 1860 and subsequently referred to the genus _Hypsiglena_ by Cope (1887), Boulenger (1894), and Mocquard (1908), and to […]

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A New Subspecies of Lizard, Cnemidophorus sacki

The systematic status of the populations of lizards assignable to _Cnemidophorus sacki_ in western México (Sonora southward to Jalisco) has been reviewed in detail by Zweifel (1959, Bull. Amer. Mus. Nat. Hist, 117 (2):57-116), who stated that the use of the specific name _sacki_ for the western populations rests upon a reasonable, but as yet […]

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A Review of the Middle American Tree Frogs of the Genus Ptychohyla

Probably no ecological group of hylid frogs (some _Hyla_ plus _Plectrohyla_ and _Ptychohyla_) in Middle America is so poorly known as those species that live in the cloud forests on steep mountain slopes and breed in cascading mountain streams. During the last half of the nineteenth century most of the species of hylids living in […]

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A Review of the Frogs of the Hyla bistincta Group

In the mountainous regions of Middle America there are several groups of hylid frogs that inhabit mountain streams. Some of these groups, such as _Plectrohyla_ and _Ptychohyla_, have been elevated to generic rank, whereas others are retained in the large and complex genus _Hyla_. In the mountains of México five species of hylids that seem […]

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Neotropical Hylid Frogs, Genus Smilisca

The family Hylidae, as currently recognized, is composed of about 34 genera and more than 400 species. Most genera (30) and about 350 species live in the American tropics. _Hyla_ and 10 other genera inhabit Central America; four of those 10 genera (_Gastrotheca_, _Hemiphractus_, _Phrynohyas_, and _Phyllomedusa_) are widely distributed in South America. The other […]

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Middle American Frogs of the Hyla microcephala Group

The small yellow tree frogs, _Hyla microcephala_ and its relatives, are among the most frequently heard and commonly collected frogs in the lowlands of southern México and Central America. The similarities in size, proportions, and coloration of the different species have resulted not so much in a multiplicity of specific names, but in differences of […]

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The Genera of Phyllomedusine Frogs

One of the most distinctive phyletic lines among the diverse Neotropical hylid frogs is composed of a group of 40 species placed in the genus _Phyllomedusa_ (Funkhouser, 1957) or in two or three different genera (Goin, 1961; Lutz, 1966). These species differ from all other Neotropical hylids by possessing a vertical, instead of horizontal, pupil. […]

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Descriptions of Two Species of Frogs, Genus Ptychohyla

Field studies on hylid frogs in southern México and northern Central America have resulted in the collection of numerous specimens of _Ptychohyla_, a genus of hylid frogs heretofore poorly represented in museum collections. Experience with the living frogs in their natural habitats has been helpful in defining the species and in formulating ideas concerning their […]

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Descriptions of New Hylid Frogs From Mexico and Central America

Biological exploration of México and Central America has revealed the presence of a diverse fauna, elements of which have undergone speciation in separate areas within the relatively small region. Some genera of amphibians, especially _Eleutherodactylus_ and _Hyla_, are represented by many species having small geographic ranges in México and Central America. Most of the species […]

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