. A check list of North American amphibians and reptiles. Amphibians -- North America; Reptiles -- North America. INTRODUCTION TO THIRD EDITION THE second edition of the Check List, which appeared in 1923, is now out of print, and the great volume of addi- tions to our knowledge of American reptiles and amphibians has been used in preparing this third edition. Many colleagues have aided us with helpful criticism and suggestions. It is impossible to mention the names of all with whom we have corresponded, but some have been of such great and constant assistance that they should be especially re
. A check list of North American amphibians and reptiles. Amphibians -- North America; Reptiles -- North America. INTRODUCTION TO THIRD EDITION THE second edition of the Check List, which appeared in 1923, is now out of print, and the great volume of addi- tions to our knowledge of American reptiles and amphibians has been used in preparing this third edition. Many colleagues have aided us with helpful criticism and suggestions. It is impossible to mention the names of all with whom we have corresponded, but some have been of such great and constant assistance that they should be especially remembered. Our hearty thanks are particularly due to Mrs. H. T. Gaige, Professor E. R. Dunn, Mr. L. , Mr. K. P. Schmidt, and Dr. Frank N. Blanchard, and also to Messrs. C. L. Walker, O. C. Van Hyning, and G. M. Netting. It may perhaps be well to restate here the spirit by which we have been guided in preparing this list. In general we have been inclined to admit all forms described since the last list unless they have been shown publicly to be untenable or unless we have a decisive opinion of our own or some other sufficient reason for rejecting them. Doubtful names may be included in the Check List for debate or as an index to litera- ture. In the use of binominals and trinominals we feel in- clined to exercise our own discretion. We are opposed to mixing the biological idea of a subspecies with the conveni- ence or inconvenience of a trinominal designation. We hold a subspecies to be a form which is manifestly descended from another form. If they are still forms connected by inter- grades we accept trinominals unless the percentage of inter- grades is so large that it becomes unprofitable so to do. But if there is reason to believe that the connection between two forms has once been broken and that the intergrades now recorded are either the result of hybridization or individual reversion, we see no gain in treating them trinominally, par-. Please note that these imag
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Keywords: ., bookauthorstej, bookcentury1900, booksubjectreptilesnorthamerica
