AMPHIBIA AND REPTILIA OF COLORADO 261 



Family Colubridae 



Thamnophis radix (Baird and Girard) 



Plains Garter Snake 



This garter snake and Thamnophis parietalis (Say) are the first 

 snakes to appear in the spring about Boulder. They are found to- 

 gether near the temporary pools, feeding upon the httle tree frog, 

 Chorophilus triseriatus (Wied), which also frequents these pools. 

 We have not taken the Plains Garter Snake in any situation above 

 6,500 feet near the foothills. 



The Plains Garter Snake has a fatal habit of coming on the rail- 

 road track during the early days to enjoy the heat of the bare ballast 

 and the iron rails. On one occasion seven dead, but recently killed, 

 specimens of this snake were found on a half-mile of track, immedi- 

 ately after the passing of a train. 



Thamnophis parietalis (Say) 

 Red-barred Garter Snake 



Boulder, April 15, May 10 and 17, 1914 (433, 436, and 439). 



Thamnophis megalops (Kennicott) 

 Pine River, La Plata County, fall of 1906 (C.C). 



Thamnophis elegans (Baird and Girard) 

 Western Garter Snake 



Bedrock, April 24, 1908 (C.C.) ; Chambers Ranch, near Glenn Eyrie, El Paso County, 

 May, igo8 (C.C); Dolores River, San Miguel County, August, 1914 (442); Naturita, 

 June 12, 1914 (443). 



Ophibolus doliatus genitilis (Baird and Girard) 

 Red King Snake 



FlagstaS Mountain, Boulder, above 6,000 ft.. May 18, 1914 (438). 



