650 NORTH AMERICAN SNAKES COPE. 



sirti(lis ohscKra), tbe change first appears on the posterior part of the 

 body. Tbe tendency to form crossbars or spots appears tirst on the 

 anterior part of the body. Tbis is slightly developed in the U. sirtaJis 

 semifasciaia, but extends throughout the greater part of the length in 

 the E. phenax. In sj^ecies in which the top of the head is pale, as E. 

 elegans vagrans, it is dark or black in the young. This dark color is 

 paled also in the E. e. couchit, and in the E. e. marciana, but leaves the 

 posterior portion as a pair of large black nuchal spots. 



In the following pages the characters of the subspecies and their 

 range are considered. 



Eiitaenia sackenii Kenuicott. 



Proc. Acad. Phila., 1859, p. 98; Cope, Pioc. U. S. Nat. Miis., 1888, p. 393. rrymtiomio- 

 don chalceits, Cojio, Proc. Acad. Phila., 18(10, p. 558. 

 Florida west to Pennsacola. » 



Eutaenia saurita L. 



Bd. and Gird., Cat., 1853, p. 24; Coluber saurila Liiiii. Syst. Nat. i, 17(10, p. 385. 

 Leptophis itanritas Ilolbrook, X. Aiiier. Herpetol., in, 1842, p. 21. Trophloiiottts 

 saiiril us Dumet Bibr., Erp. Gen., "S'lii, 1854, p. 585. Schleo;el Ess. s. Pbj-sioii. St;ip., 

 I, p. (i9 ; II, p. 58(1; GUntber, Cat. Colubr., Snakes, Brit. Mus., ltS58, p. 72; Jau., 

 Icon. Geu. OHd., ii, 26 ; I, fig. 1 ; dorsal stripe too wide. 



Eastern and Austroriparian regions except Texas. 



Eutaenia proxima Say. 



Bd. and Gird., Cat., 1853, p. 25. Coluber proximus Say, in Long's Exped. Rocky 

 Mts., I, 1823, p. IrtT. Euiania faireiii Bd. and Gird., Cat., 1853, p. 25. 



The Mississippi Valley from Indiana and Illinois; Texas and Mex:co 

 below the plateau to Tehuantepec. 



The individuals found in tbe Mississippi Valley from NeM' Orleans 

 northwards are mostly of a darker color than those from other regions, 

 tbe spaces between the strijies being generally black. {E.faireyi W. &. G.) 

 Tbis form accompanies the typical and lighter colored one in Louisiana 

 and eastern Texas as far west as Dallas. Many transitions between the 

 two occur. Specimens from Vera Cruz have a metallic refulgence. A 

 ])air of specimens from Fort Stockton, Tex., have the same character, 

 and tbe dorsal stripe isindistinct, having no lateral black borders. The 

 west Texas form generally has the dorsal stripe reddish. 



Eutasnia niegalops Kennicott. 



Proc. Acad. Phila., 18G0, p. 330 ; Cope, Proc. Anier. Pbilos. Soc, 1884, p. 173. 



Sonoran region (southern New Mexico and Arizona and Chihua- 

 hua). 



Eutaenia radix Bd. and Gird. 



Cat. Scrp. N. Anier., Pt. i, Serpents; Cope, Check List Batv. Rept. N. Am. ,1875, 1853, 

 )). 34. Eutcenia hai/denii Kennicott, Rept. U. S. Pac. R. R. Snrv., suppl. to Vol. 

 I (Vol. XII), 1859, p. 298. 



Kutania radix iwinhuiii Cones and Henshaw. 



Eutimia radix melanotienio. Cope, Proc. U. S. Nat. Mns., 1888, p. 400. 



