ACADEMY OF SCIENCES. 67 



■whole country continues sterile. A similar country extends eastward through 

 a great part of Arizona, and is inhabited by most of the same animals.* Such 

 a region can support but few of the higher animals, and they are consequently 

 scarce, both in species and individuals.  The following do not occur west of 

 this region. 



MAMMALS. 



1. Spermopliilus Harrisii AvD. & Bacu., Harris' Ground Squirrel. 



2. Perognatlius penicillatus WooDu., Brush-tailed Pouched Rat. 



3. Hesperomijs cremicus? Baird, Desert Mouse. 



BIRDS. 



1. Harporhynchus Lecontii Lawr., ' Lec««te's Mock Thrush. 



REPTILES. 



1. Xerobates Agassizii Cp., Agassiz"s Land Tortoise. 



2. Dipsomurus dorsalis Hallow., Sharp-back Lizard. 



3. Uta symn7etnca Baird, Graceful Lizard. 



4. Uta Schottii Baird, ' Schott's Lizard. 



5. Heloderma horridum Wiegm., Warty Lizard. 



6. Euphnjne obesa Baird, Fat Lizard. 



7. Phrynosoma regale Girard, Regal Horned Toad. 



8. Doliosaurus McCallii Girard, McCall's Horned Toad. 



9. Doliosaurus plat yrfunos Girard, Broad-nosed Horned Toad. 

 10. Uma notata Baird, Spotted Yuma Lizard. 

 IL Stenodadylus variegatiis Baird, Variegated Lizard. 



12. Caliisaurus ventralis Hallow., • Beautiful Lizard. 



13. Crotalus cerastes Hallow., Horned Rattlesnake. 



14. Rena humilis Baird & Grd., Sheep-nosed Snake. 



15. Ophisaiirus ? Glass Snake. 



It is indeed the paradise of Reptiles, especially of Iiizards, resembling the 

 deserts of Northern Africa and Syria in this respect. One species of fish is 

 found in the Mojave River (also in the Merced). Of the characteristic produc- 

 tions between lat. 35° and 37° very little is known, as no naturalist has col- 

 lected there or described it. It may be perhaps considered a distinct region 

 north of lat. 34^, more elevated, and forming part df the Great Basin, but too 

 little is known of its fauna to separate the species 



III. Southern Coast Slope. 



Next toward the west is the lofty range of mountains which slope down to 

 the ocean, and whose summits are between 4,000 and 8,500 feet above its level. 

 Above an altitude of 5,000 feet there is considerable forest on them, which, as 

 far as known, consists of northern species of trees, and is inhabited chiefly by 

 northern'animals. There may be others, but they have not been .determined, 

 no opportunity of collecting there having been afforded me. I therefore con- 

 sider the southern coast slope as forming but one region, extending from lat. 

 32° 30' to 34° 30', 140 miles long, and about 50 wide. The neighboring 



* Sjee Cones in Proc. Phil. Acad. 1866. 



