Examination of the materials used by Howell (_op. cit._) reveals that there is an increase in size of animal and its skull from within the geographic range of _S. g. martirensis_ southward to Cape St. Lucas which is the type locality of _S. lucasana_. Specimens of _S. microdon_, which so far has been recorded only from Comondú, the type locality, are, as would be expected, intermediate in size between _S. g. martirensis_ and _S. lucasana_. The differential characters of these three named kinds of _Spilogale_ are principally those of size, and we can see no characters judged to be of more than subspecific worth. Consequently the named kinds should stand as: _Spilogale gracilis martirensis_ Elliott; _Spilogale gracilis microdon_ A. H. Howell; _Spilogale gracilis lucasana_ Merriam. ~Spilogale gracilis microrhina~ Hall When Hall (Jour. Mamm., 7:53, February 15, 1926) named as new _Spilogale phenax microrhina_, he did not mention specimens previously recorded by A. H. Howell (N. Amer. Fauna, 26:32, November 24, 1906) as _Spilogale phenax_ from San Bernardino Peak (57026 USBS), La Puerta (99580 USBS), Dulzura (55848, 56173, 56873, 33693/45728, 36291/48656 and 36292/48657) in southern California. On geographic grounds these specimens would be expected to be _S. g. microrhina_ although geographically slightly outside the area that could be delimited by Hall's (_op. cit._) marginal record-stations of occurrence. Our examination of the pertinent specimens reveals that they are _Spilogale gracilis microrhina_. The localities from which the specimens came are, respectively, the northeasternmost, easternmost and southernmost occurrences so far listed for the subspecies. ~Conepatus mesoleucus mearnsi~ Merriam Examination of the holotypes of _Conepatus filipensis_ Merriam, _Conepatus pediculus_ Merriam, _Conepatus sonoriensis_ Merriam, and _Conepatus mesoleucus mearnsi_ Merriam, and other specimens of the two kinds last named, convinces us that all are the same species and that the names should stand as follows: _Conepatus mesoleucus filipensis_ Merriam (type locality, Cerro San Felipe, Oaxaca); _Conepatus mesoleucus pediculus_ Merriam (Sierra Guadalupe, Coahuila); and _Conepatus mesoleucus sonoriensis_ Merriam (Camoa, Río Mayo, Sonora). One method of designating the ages of individuals in _Conepatus_ is to recognize four categories from younger to older, as follows: 1) juvenile--retaining one or more deciduous teeth; 2) young--sutures open and clearly to be seen between bones of the facial part of the skull; 3) subadult--skull of adult form, but lacking sagittal and lambdoidal crests and retaining faint traces of sutures between facial bones; and 4) adult--sutures obliterated, lambdoidal ridge high and temporal ridges (of females) or sagittal crest (of males) prominent.