86 UNIVERSITY OF COLORADO STUDIES 



Ferril; Aurora Lake, Denver, September 3, 1900 (2 specimens, 475 and 710 mm.), 

 W. C. Ferril; Highline Ditch, Denver, September 3, 1900 (690 mm.), W. C. Ferril; 

 Denver, June 10, 1901 (860 mm.), C. F. Leach; Denver, June 27, 1903 (850 mm.), 

 Mrs. H. B. McCurdy; Yuma, June 6, 1905 (600 mm.), H. G. Smith; Julesburg, 

 August 25, 1905 (230 mm.), H. G. Smith; Boulder, December 12, 1911 (470 mm.), 

 L. C. Bragg; Slate Teachers' College Museum: Las Animas, Baca and Weld coun- 

 ties, A. E. Beardsley; reported by Henderson from Goodrich, Colo., June 22, 1912. 



Thamnophis megalops (Kennicott) 



Arizona Garter Snake 

 Eutaenia megalops Kennicott, Proc. Acad. Nat. Sci. Phila., p. 330, i860. 

 Eutaenia macrostemma megalops — Yarrow, U.S.N.M. Bull. 24, p. 117, 1882 

 (Rio Grande, Colo.). 



This species differs from Thamnophis radix (Baird and Girard), 

 particularly in the number of superior labials, the usual number being 

 8, or occasionally 9. The spots between the dorsal and lateral stripes 

 do not give such a pronounced checkerboard pattern and the snake 

 as a whole is of a duller, lighter color. 



This species is included in the fauna of Colorado on the record of 

 a specimen taken by H. W. Henshaw, June, 1873, a t Ri° Grande, 

 Colo. It ranges over the whole of the Mexican plateau and into 

 northern Arizona and New Mexico. It is then to be expected in 

 Conejos, Archuleta, LaPlata and Montezuma counties of Colorado. 



Thamnophis parietalis (Say) 



Red Barred Garter Snake {Figure ig) 



Coluber parietalis Say, Long's Exped. Rocky Mis., Vol. I, p. 186, 1823. 



Eutaenia sirtalis dorsalis — Yarrow, Wheeler Survey, Vol. V, p. 554, 1875 

 (Rio Grande, Colo.). 



Eutaenia sirtalis obscura — Yarrow, U.S.N.M. Bull. 24, p. 126, 1882 (southern 

 Platte; between the Arkansas and Cimarron, N.Mex.). 



Thamnophis sirtalis parietalis — Ruthven, U.S.N.M. Bull. 61, p. 167, 1908 

 (Ft. Collins, Denver, Greeley, Colo.) ; Cockerell, Univ. Colo. Studies, Vol. VII, 

 p. 131, 1910 (Meeker and Buford, Colo.). 



Dorsal scales in 19 rows, in 17 rows over the posterior portion of 

 the body; all scales keeled, those of the first row weakly so. Superior 

 labials, usually 7, 1st, 2d, 3d, and the 4th and 7th, subequal, 5th 



