106 CALIFORNIA ACADEMY OF SCIENCES. 



limbs may be either uiiicolor or irregularly mottled with 

 brown. The lower surfaces are white or yellowish, 

 sometimes suffused with pale brown or gray. The ab- 

 dominal and thoracic regions are rarely without gray or 

 slate-colored lines along the middle of each longitudinal 

 series of scales. 



Young specimens are at first indistinguishable from 

 G. hurnettii of a similar age, but the complete dorsal 

 cross-bands very soon appear. 



Length to amis 41 60 80 114 1.35 154 



Length of tail 83 1.39 159 226 294 



Snout lo ear 10 12 17 23 30 34 



Width of head 7 8 11 15 21 28 



Head to interoccipital 9 11 14 18 22 25 



Fore limb 12 14 20 30 36 40 



Hind limb 16 21 27 .39 48 53 



Base of fifth to end of fourth toe 5 7 10 14 16 17 



Distribution. — The Alligator Lizard ranges over the 

 whole length of California, but, I believe, has never 

 been found east of the Sierra Nevada or on the Colorado 

 or Mojave Deserts. In the south it appears to be the 

 only species of the genus, but in the north its range 

 overlaps that of G. burnettii, G. palmeri, and G. principis. 

 Mr. H. W. Henshaw found it on Santa Cruz Island. I 

 have examined specimens from Santa Rosa Island and 

 from Shasta (Redding), Mendocino (Irishes, Fairbanks), 

 Lake (Blue Lakes, Kelseyville), Napa (St. Helena), 

 Sonoma (Santa Rosa), Marin (Lagunitas), Alameda 

 (Calaveras Valley, Livermore, Haywards, Oakland, 

 Berkeley), Santa Clara (Palo Alto, Santa Clara, College 

 Park, Smith Creek, Los Gatos), Santa Cruz (Corralitos, 

 Soquel), Monterey (Pacific Grove), El Dorado (Fyffe 

 3700 feet, Riverton 4000 feet), Mariposa (near Wawona), 

 Tulare (Three Rivers, East Fork Kaweah), Santa Bar- 

 bara (Santa Barbara), San Bernardino (Lytle Creek), 



