Returning now to the generic names applied to the bats concerned, it is to be noted that from 1803 until 1909 _Nycteris_ had been used as the generic name of an African bat on the erroneous assumption that the name was first applied in a valid fashion to the African bat. With the aim of conserving the name _Nycteris_ for the African bat, some zoologists petitioned the International Committee on Zoological Nomenclature to set aside the Law of Priority and petitioned also that the name _Lasiurus_ be validated for use again as the generic name for New World bats. This petition was granted in 1914 in the first lot of names for which exception to the rules was made. As a result, since 1914 _Lasiurus_ has been used with increasing frequency, and _Nycteris_ with decreasing frequency, for New World bats. The above explanation of the application of the generic names _Nycteris_, _Atalapha_, and _Lasiurus_ is given for two reasons: First, study of more abundant material than was available to Harrison Allen in 1894 when he raised _Dasypterus_ to generic rank reveals, as set forth beyond, that the yellow bats are not generically different from the red bats and hoary bat and so will bear the same generic name that is applied to the red bat and hoary bat; second, a choice of generic names has to be made. Actually, the International Commission on Zoological Nomenclature since 1913 has voted to make many, instead of only a few, exceptions to the rules. The number of names resulting from these exceptions is becoming so large that some zoologists fear that the chaotic condition of nomenclature in the previous century will return. Those who hold such fears maintain that adherence to the rules of 1901, or to the Law of Priority, or at least to some rules, clearly is desirable. Certainly there is much logic in that view. According to the rules, _Nycteris_ is the correct name of the bats concerned. According to the Commission, it is well to use instead the name _Lasiurus_. Perhaps the time has come to follow the rules and use _Nycteris_. But, because of the possibility that the Commission will return to its policy of 1913 and recommend only a few instead of many exceptions to the rules, the generic name _Lasiurus_ is tentatively used in the following accounts. Genus Lasiurus Gray Hairy-tailed Bats