Sistrurus catenatus

Family Viperidae

Adults 24" to 36" in length. Color light gray to grayish brown, with median row of darker blotches on back; typically with three rows of similar but smaller blotches on sides. Wide head, with enlarged scales between and in front of eyes. Narrow neck, and stout body, and keeled scales. Eyes with vertical pupils.
Elevation Range:
Below 5500' in southeastern Colorado.
Subspecies in Colorado:
Integrades between Sistrurus catenatus edwardsii and S. c. tergeminus in southeastern Colorado
Photo by L. Livo and S. Wilcox,
from Hammerson, 1986.
Used with permission.
CountyRef. CountyRef. CountyRef. CountyRef.
Adams  Dolores  La Plata  Pitkin 
Alamosa  Douglas  Lake  ProwersJH4
Arapahoe  Eagle  Larimer  PuebloH
Archuleta  El PasoSTP1 Las AnimasGAH8 Rio Blanco 
Elbert  LincolnH Rio Grande 
BentH Fremont  Logan  Routt 
Boulder  Garfield  Mesa  Saguache 
Chaffee  Gilpin  Mineral  San Juan 
CheyenneH Grand  Moffat  San Miguel 
Clear Creek  Gunnison  Montezuma  Sedgwick 
Conejos  Hinsdale  Montrose  Summit 
Costilla  Huerfano  Morgan  Teller 
CrowleyH Jackson  OteroH Washington 
Custer  Jefferson  Ouray  Weld 
Delta  KiowaH 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