Leptotyphlops humilis - Western blind snake
Source: NPS, http://www.nps.gov/tont/nature/snakeblind.htm
Source: https://commons.wikimedia.org/wiki/File:Leptotyphlops_humilis.jpg

Leptotyphlops humilis (western blind snake) is a blind snake species endemic to the southwestern United States and northern Mexico. Common names include western slender blind snake, western threadsnake, and western blind snake. Order: Squamata, Suborder: Serpentes, Family: Leptotyphlopidae, Genus: Leptotyphlops, Species: Leptotyphlops humilis (Baird & Girard, 1853)
Synonyms:
Rena humilis Baird & Girard, 1853
Stenostoma humile — Cope, 1875
Rena humilis — Cope, 1887
Glauconia humilis — Boulenger, 1893
Siagonodon humilis — Van Denburgh, 1897
Leptotyphlops humilis — Ruthven, 1907
L[eptotyphlops]. h[umilis]. humilis — Klauber, 1931
Leptotyphlops humilis humilis — H.M. Smith & Taylor, 1945
Leptotyphlops chumilis Rhodes, 1966 (ex errore)
Rena humilis — Adalsteinsson et al., 2009