PAGE INTRODUCTION 471 Acknowledgments 471 THE HYLA BISTINCTA GROUP 472 Analysis of Characters 473 Key to the Species of the Hyla Bistincta Group 474 ACCOUNTS OF THE SPECIES 475 _Hyla bistincta_ Cope 475 _Hyla charadricola_ new species 478 _Hyla robertsorum_ Taylor 481 _Hyla pachyderma_ Taylor 485 _Hyla crassa_ (Brocchi) 486 RELATIONSHIPS 489 LITERATURE CITED 491 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 tha…
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