May, 1893.] REPTILES OF THE DEATH VALLEY EXPEDITION. 185 



and with the actual types of Baird and of Cope, and with specimens 

 before me out of the same bottles upon which Boulenger founded his 

 variety, I have no hesitation in pronouncing all these names synony- 

 mous, and in asserting that Bocourt's 8. biseriatus is the same as Hal- 

 lowell's. Boulenger's bocourtii, however, is somewhat composite, as I 

 do not believe that the Monterey specimens, at least, belong to it. I 

 have no doubt that they are referable to 8. occidentalism with which the 

 present form is easily confounded, on account of the fact that both 

 differ from typical 8. undulatus in the females having the blue patches 

 almost as well developed as the males.* 



[Sceloporus biseriatus is one of the few lizards inhabiting both the 

 desert ranges of the Great Basin and the interior valley of California. 

 Specimens were obtained at frequent intervals all the wayfrom the Upper 

 San Joaquin Valley, in California, to the Upper Santa Clara Valley, in 

 Utah, about 10 miles northwest of St. George. On the east side of the 

 Great Divide, in California, it was obtained on the Panamint, Argus, 

 Coso, White, and Inyo mountains, and at the east foot of the Sierra in 

 Owens Valley (on Independence Creek). On the west side of the Great 

 Divide it was common on the west slope of Walker Pass and thence 

 down into Kern Valley to the neighborhood of Kernville, and southerly 

 along the west slope of the Sierra to Havilah and Walker Basin, and 

 northerly to Three Bivers. It was common also in the Canada de las 

 Uvas, and in the Upper San Joaquin Valley, where specimens were col- 

 lected at Kern Lakes, Tulare, and Fresno. In Nevada it was collected 

 on the Charleston Mountains (near Mountain Spring), on Mount Magru- 

 der, in the Juniper Mountains, and in the Grapevine Mountains. 



A black form (having the belly intensely blue-black) was found on 

 black lava rock in Diamond Valley, Utah; on the Charleston Moun- 

 tains (near Mountain Spring), Nevada, where it was found both on 

 rocks and on juniper trees, and on the White Mountains, near the east- 

 ern boundary of California. In the latter locality it was common on 

 the summit of the divide near the road between Deep Spring and Owens 

 valleys, where it was frequently seen on and among light colored rocks, 

 which made it unusually conspicuous. It is entirely possible, however, 

 that this very striking contrast is a protection, causing the lizard to re- 

 semble the dark cracks in the rocks when viewed from above by pass- 

 ing hawks.— C. H. M.] 



*Yarrow's S. undulatus ihayeri (Bull. U. S. Nat. Mus., 24, p. 60) consists mainly of 

 S. biseriatus, but also to some extent of S. occidentalis. To the latter are also refera- 

 ble Cope's specimens similarly named in Proc. Phil. Ac, 1883, p. 28, and probably 

 torn, cit., pp. 23 and 27. 



