. Annals of the New York Academy of Sciences. Science. New Species of Aplodontia. 32? animal was disposed of by Cones in his Monograph of the genus. ''Professor Peters," writes Dr. Cones, "described specimens from California as constituting a new variety, to which he ap- plied the name Haplodon leporinus var. Californicus. I have seen no specimens from that region, nor is the material at present available sufficient to enable us to come to final conclusions re- specting the normal rate of susceptibility to individual variation. The few specimens, however, indicate that the rate is at
. Annals of the New York Academy of Sciences. Science. New Species of Aplodontia. 32? animal was disposed of by Cones in his Monograph of the genus. ''Professor Peters," writes Dr. Cones, "described specimens from California as constituting a new variety, to which he ap- plied the name Haplodon leporinus var. Californicus. I have seen no specimens from that region, nor is the material at present available sufficient to enable us to come to final conclusions re- specting the normal rate of susceptibility to individual variation. The few specimens, however, indicate that the rate is at least as high ms that which has been established for various mammals more or less closely allied ; and, should such prove really the case, there would be no impropriety in considering var. califor- nicus as strictly ; (Monographs of North Ameri- can Kodentia, 1877, p. 598.) This statement of Cones contains one error of fact (for Peters had but one specimen—not speci- mens), and its final assumption wTas based, doubtless, on a very hasty examination of Peters's description. CRANIAL DIFFERENCES RESULTING FROM SEX AND AGE. In placing the adults of A. major side by side, the most notice- able sexual difference is found in the suture which separates the frontal bones from the premaxillaries and nasals. This suture is open in the females and closed in the Fig. 1. Aplodontia major $ ad. (JSo. 2107 Mus. C. H. M.) showing persistent fronto-premaxillary suture. Natural Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York Academy of Sciences. New York, New York Academy of Sciences
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