. Bulletin - American Museum of Natural History. Natural history; Science. 208 Bulletin American Museum of Natural History. [Vol. VII, in size, besides that evidently due to age, and striking differences in certain structural details. The remarks which follow will be based wholly on the San Bernardino scries, and mainly on the females of that series. Variation due to Age.—The youngest specimen is a third- grown female. The skull is very short in proportion to its width, the shortness being due mainly to the comparative non-develop- ment, at this age, of the rostral and interorbital portions. T
. Bulletin - American Museum of Natural History. Natural history; Science. 208 Bulletin American Museum of Natural History. [Vol. VII, in size, besides that evidently due to age, and striking differences in certain structural details. The remarks which follow will be based wholly on the San Bernardino scries, and mainly on the females of that series. Variation due to Age.—The youngest specimen is a third- grown female. The skull is very short in proportion to its width, the shortness being due mainly to the comparative non-develop- ment, at this age, of the rostral and interorbital portions. The interorbital breadth is relatively very great, often actually greater than in the fully adult, and the zygomatic arches are relatively narrow. The interparietal is also relatively very large. This is well shown by the following comparative measurements and figures (Figs. 3-5) : No. Total length. Pre- parietal length. 17-5 21 24 23-5 Rostral length. 8 8-3 11 12 12 f4 Mastoid breadth. Zygo- matic breadth. Inter- orbital breadth. 6 .6 6 6 6 Interparietal. Width. Length. 6803 S juv. 6799 V 6794 V 6797 S 6767 S 6753 $ ad . 29 30 33 37 42 16 16 IS 21 21 19 18 24 -5 25 26 6 5 3-5 3 2-5 4-5 3 3 2 3 3-5 3-3 The skulls given above as ' adults ' are only middle-aged, there being no very old skulls in the series. The Inst one given is a somewhat older male from 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 American Museum of Natural History; Allen, J. A. (Joel Asaph), 1838-1921. New York [American Museum of Natural History]
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