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 1 8 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 FITZINCER. Syst. Kept., 1843, p. 24 (type, nigricans); 



STEJNEGER, Proc. U. S. Nat. Mus., 1891, p. 501. 

 Slenostoma, WAGLER, Nat. Syst. Amphib., 1830, p. (not of Latreille, 



1810). 

 Catodon DUMRIL et BIBRON, Erp6t. Gc'nei., Vol. VI, 1844, p. 318 (not 



of Artedi). 

 Glaucoma GRAY, Cat. Lizards Brit. Mus., 1845, p. 139; COPE, Proc. 



U. S. Nat. Mus., Vol. XIV, 1892, p. 589; BOULENGER, Cat. Snakes 



