22. SIAGONODON 627 
and near Bennett Wells in Death Valley, Inyo County. 
Boulenger records a specimen from San Bernardino, 
San Bernardino County, and it has been taken also in the 
Shover Mountains, near Colton, in this county. It probably 
occupies most of the intervening desert regions. It occurs 
in both Upper and Lower Sonoran zones. 
In Arizona it has been collected at Fort Mohave, Mohave 
County, Yuma, Yuma County, Tucson, Pima County and in 
the foothills of the Catalina Mountains about 18 miles north- 
east of Tucson, and Sabino Canyon, Pima County. 
In Lower California it has been found at San Ignacio, and 
on Cerros Island, and, in the Cape Region, at Cape San 
Lucas, San Jose del Cabo, San Francisquito, Sierra Laguna, 
and La Paz. 
It ranges south on the mainland of Mexico to Colima, and 
has been taken in Sonora at San Miguel de Horcasitas. 
Habits—This little snake evidently is a burrowing 
species. Professor Thornber found several in a pile of 
manure on the Greasewood plains east of Tucson. Mr. 
Herbert Brown found one under a stone about a foot square, 
about 20 feet from the edge of a pool of water. Under the 
stone the earth had been worked from between the grass 
roots, showing several runways, in one of which the snake 
was coiled. 
Genus 23. Leptotyphlops 
Leptotyphlops Firzincer. Syst. Rept., 1843, p. 24 (type, nigricans); 
STEJNEGER, Proc. U. S. Nat. Mus., 1891, p. 501. 
Stenostoma, Wac.ER, Nat. Syst. Amphib., 1830, p. — (not of Latreille, 
1810). 
Catodon Dumérix et Brsron, Erpét. Génér., Vol. VI, 1844, p. 318 (not 
of Artedi). 
Glauconia Gray, Cat. Lizards Brit. Mus., 1845, p. 139; Cope, Proc. 
U.S. Nat. Mus., Vol. XIV, 1892, p. 589; Boutencer, Cat. Snakes 
