Black-necked Garter Snake

Thamnophis cyrtopsis (Kennicott, 1860)

Spanish Name(s)	Culebra Lineada de Bosque Jarretera (T. c. collaris) Jarretera Occidental (T. c. cyrtopsis)
U.S. Range	Arizona, Colorado, New Mexico, Texas and Utah
Mexican Range	Aguascalientes, Chiapas, Chihuahua, Coahuila, Colima, Distrito Federal, Durango, Guanajuato, Guerrero, Hildalgo, Jalisco, Mexico, Michoacan, Morelos, Nayarit, Nuevo Leon, Oaxaca, Puebla, Queretaro, San Luis Potosi, Sinaloa, Sonora, Tamaulipas, Tlaxcala, Veracruz and Zacatecas
Central American Range	Guatemala
Legal Status	None known. Consult provincial or state pages for legal restrictions on keeping this species in captivity.
Diet	An amphibian specialist; mostly anurans and tadpoles. Will eat fish in captivity.
Max. Recorded Length	114.4 cm
Pet Trade Availability	3 – Frequently available.
Captivity Rating	3 – Good captive.

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Tropical Black-necked Garter Snake Thamnophis cyrtopsis collaris (Jan, 1863): Southwestern and southern Mexico; Guatemala.
Western Black-necked Garter Snake Thamnophis cyrtopsis cyrtopsis (Kennicott, 1860): West Texas, western U.S., and north-central Mexico.
Eastern Black-necked Garter Snake Thamnophis cyrtopsis ocellatus (Cope, 1880): Central Texas. A brilliantly colored subspecies.

(No common name found) Thamnophis cyrtopsis cyclides Cope, 1861: Synonymized with T. c. collaris.
Mesoamerican Highlands Garter Snake Thamnophis cyrtopsis fulvus (Bocourt, 1893): Now recognized as a separate species, T. fulvus.
Tepalcatepec Valley Garter Snake Thamnophis cyrtopsis postremus H. M. Smith, 1942: Now recognized as a separate species, T. postremus.
Yellow-throated Garter Snake Thamnophis cyrtopsis pulchrilatus (Cope, 1885): Now recognized as a separate species, T. pulchrilatus.
(No common name found) Thamnophis cyrtopsis vicinus H. M. Smith, 1942: Now considered a morph of T. c. collaris.