Brooklyn Museum Quarterly . PY, AND RATTLESNAKE;DETAIL OF THE GROUP tropics. But before the onslaiiohts of hunters, they havewithered away, their exceedingly delicate adjustment to arather limited environment, and consequent non-adaptabil-ity, doubtless contributing nnich toward their rapid exter-mination. Within the vastly reduced present range of thespecies, three geographical races are recognized, one belong-ing to the United States and Canada, the second to theMexican mainland, and the third to the Lower Californianpeninsula including the desert basins that extend northwardto the United St
Brooklyn Museum Quarterly . PY, AND RATTLESNAKE;DETAIL OF THE GROUP tropics. But before the onslaiiohts of hunters, they havewithered away, their exceedingly delicate adjustment to arather limited environment, and consequent non-adaptabil-ity, doubtless contributing nnich toward their rapid exter-mination. Within the vastly reduced present range of thespecies, three geographical races are recognized, one belong-ing to the United States and Canada, the second to theMexican mainland, and the third to the Lower Californianpeninsula including the desert basins that extend northwardto the United States boundary. The last subspecies, knowntechnically as Aufilocapra amcricana peninsularis, is theform shown in the desert life group. Other animals in the exhibit comprise a young jackrabbit, desert quail, cactus wrens, a phainopepla, a rattle-snake, several lizards, and three or four typical desert of these will be mentioned in more detail in thenarrative which follows. IST) The Lower California Expedition. MAP OF THE COLORADO DESERT The desert that Hes westof the lower stretches of theRiver Colorado, partly withinthe southeastern corner of theState of California and partlyin Mexico, has been, since Ter-tiary times, the driest sectionof the North American Con-tinent. This region extends,in the form of an arid depres-sion, from the San Jacintoand Chuckawalla Mountainssouthward nearly two hun-dred miles to the Gulf of Cali-fornia. On the eastern side itis bounded by the Sonoran Mesa, and on the west by the mainescarpment of the Rocky Mountain coastal ridge which comesdownward from the famous San Gorgonio Pass as the back-bone of the Lower Californian peninsula. Through thesouthern part of this dry expanse a range of mountains,called the Cocopahs, runs in a general northerly and south-erly direction and divides the desert into two branches whichmerge in the south near the mouth of the Colorado. Thenorthern and eastern branch comprises the Salton Basin andthe delt
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