176 University of California Publications in Zoology  [Vou.17 
pp. 350-352 (type from Yosemite Valley, Mariposa County [see Camp, 
Univ. Calif. Publ. Zool., 17, 1916, pp. 72-73] ) ; Hwmeces skiltonvanus 
var. brevipes Cope, Ann. Rep. U. S. Nat. Mus., 1898 [1900], pp. 648- 
644 (type from Fresno) ; Hwmeces hallowellii Bocourt, in Duméril, 
Bocourt, and Moquard, in Miss. Sei. au Mex., Recherch. Zool., pt. 3, 
sec. 1, 6° livr., 1879, p. 485, Atlas, [1881], pl. 22n, fig. 7 (type from 
California) ; Humeces skiltonianus var. amblygrammus Cope, loc. cit., 
p. 648 (type from Fort Humboldt) ; Humeces skiltonianus. 
Common Names.—Blue-tailed Lizard; Skilton’s Skink; Red-headed 
Skink; Gilbert’s Skink; Blue-tailed Skink. 
RanGE.—Nearly the entire state; absent on the southeastern deserts 
and on the Sierra Nevada above 8000 feet altitude. Occurs east to 
head of Willow Creek, 7000 feet altitude, Panamint Mountains, Inyo 
County (Stejneger, N. Amer. Fauna, 7, 1893, p. 202) ; southeast to 
Maturango Spring, Argus Range, Inyo County (Stejneger, loc. cit.) ; 
to Kern River near Isabella (Mus. Vert. Zool.) and old Fort Tejon 
(Stejneger, loc. cit.), in Kern County; to Barley Flats, 5500 feet 
altitude, San Gabriel Mountains, Los Angeles County (Mus. Vert. 
Zool.) ; to Bluff Lake, San Bernardino Mountains, San Bernardino 
County (Van Denburgh, Proce. Calif. Acad. Sci., ser. 4, 3, 1912, 
p. 149) ; to Strawberry Valley, 5500 feet altitude, San Jacinto Moun- 
tains, Riverside County (Atsatt, Univ. Calif. Publ. Zool., 12, 1913, 
p. 41) ; and to Jacumba Hot Springs, San Diego County (Cope, Ann. 
Rep. U. S. Nat. Mus., 1898 [1900], p. 644). Occurs also on Santa 
Catalina Island (Van Denburgh, Proce. Calif. Acad. Sci., ser. 4, 4, 1914, 
pp. 132, 138). Inhabits chiefly the Upper Sonoran life-zone, but 
extends also through Transition. Characteristic habitat, rocky or 
wooded hillsides and cafon bottoms; lives beneath stones and masses 
of dead vegetation. 
Suborder SERPENTES 
Family LEPTOTYPHLOPIDAE 
Leptotyphlops humilis (Baird and Girard) 
Worm Snake 
ORIGINAL DescripTION.—Rena humilis Baird and Girard, Cat. N. 
A. Reptiles in Smiths. Inst., pt. 1, 1853, p. 143. 
Type Locaurry.—Valliecitas [— Vallecito, San Diego County], 
California. 
