Night Snake
Hypsiglena torquata

Family Colubridae

Adults 12" to 20" in length. Color gray, yellowish, or beige, with dorsal row of dark brown spots. Row of smaller spots on sides; usually a large brown blotch on each side of neck. Moderately slender body; scales smooth. Pupils vertical in bright light. Divided anal plate. Enlarged, ungroved teeth at rear of jaw; saliva toxic to lizards.
Elevation Range:
Below 6000' in southeastern Colorado; to 7900' in southwestern Colorado.
Subspecies in Colorado:
Hypsiglena torquata loreala in western Colorado;
Hypsiglena torquata janii in southeastern Colorado.
  Night Snake
Photo from Hammerson, 1986.
Used with permission.
CountyRef. CountyRef. CountyRef. CountyRef.
Adams  Dolores *  La Plata  Pitkin 
Alamosa  Douglas  Lake  Prowers * 
Arapahoe  Eagle  Larimer  PuebloH
Archuleta  El Paso *  Las AnimasLJL1
Rio Blanco 
BacaH Elbert  Lincoln  Rio Grande 
BentH FremontH Logan  Routt 
Boulder  GarfieldJR2 MesaH Saguache 
Chaffee  Gilpin  Mineral  San Juan 
Cheyenne  Grand  Moffat  San Miguel * 
Clear Creek  Gunnison  MontezumaH Sedgwick 
Conejos  Hinsdale  Montrose *  Summit 
Costilla  HuerfanoH Morgan  Teller * 
Crowley *  Jackson  OteroH Washington 
Custer *  Jefferson  Ouray  Weld 
DeltaCDOW3 Kiowa *  Park  Yuma 
Denver  Kit Carson  Phillips 
Map of Colorado
Color Key
Adams Alamosa Arahapoe Archuleta Baca Bent Boulder Chaffee Cheyenne Clear Creek Conejos Costilla Crowley Custer Delta Denver Dolores Douglas Eagle El Paso Elbert Fremont Garfield Gilpin Grand Gunnison Hinsdale Huerfano Jackson Jefferson Kiowa Kit Carson La Plata Lake Larimer Las Animas Lincoln Logan Mesa Mineral Moffat Montezuma Montrose Morgan Otero Ouray Park Phillips Pitkin Prowers Pueblo Rio Blanco Rio Grande Routt Saguache San Juan San Miguel Sedgewick Summit Teller Washington Weld Yuma