The specimens of _L. c. curti_ are all females, which, in the genus _Lepus_, average larger than the males. Comparison of the measurements recorded below with those in the account by Nelson (N. Amer. Fauna, 29:129, 1909) may not reveal the full measure of difference in size between _L. c. curti_ and other subspecies because Nelson (_op. cit._) pooled males and females in obtaining the average measurements that he records. For example, he used three males and two females of _Lepus altamirae_ in obtaining an average (_op. cit._:117). The specimens of _L. c. curti_ here recorded are thought to be of full size inasmuch as the degree of fusion of bones in the skull, and the density of the cranial bones indicate full adulthood for each specimen. Reproductive-wise, there is no question as to adulthood; each of the four females was pregnant. One specimen had two embryos (each 30 millimeters long in crown-rump measurement) and each of the other specimens contained one embryo. These three embryos were 55, 60, and 105 mm. long. Three of our specimens, including the holotype, were obtained north of the eighth pass and the other specimen, No. 35473, was obtained a few hundred yards south of the pass. Because the part of the barrier beach south of the pass was connected to the mainland, it is likely that the newly named subspecies occurs also on the adjacent mainland; however, we have examined no specimens of _Lepus californicus_ from the opposite mainland except from Matamoros, ninety miles to the north, and from Altamira, approximately one hundred and fifty miles south of our collecting locality. A specimen from Matamoros, Tamaulipas, and several from Brownsville, Texas, in size of auditory bullae, larger overall size and darker color clearly are _L. c. merriami_ and not _L. c. curti_. The small tympanic bullae of the specimens from Padre Island were commented upon by Nelson (_op. cit._:149) who found smallness of bullae to characterize many of the specimens from the eastern part of the geographic range of _L. c. merriami_. In the northeastern part of the geographic range of _L. c. merriami_, as Nelson pointed out, the small size of the tympanic bullae was one of several evidences of intergradation there with _Lepus californicus melanotis_, the subspecies next adjacent to the north. In the light of present information, it seems that the smallness of the tympanic bullae in the specimens (3) from Padre Island may be an independent development--an adaptation to environmental conditions that reaches its fullest development on the same chain of islands eighty-odd miles southward of Matamoros. The specimens from Padre Island, although possessing small bullae, in other features, for example, larger size of other parts, are _merriami_.