OPHIDIA COLUBRIDAE EUTAENIA ORNATA. 



553 



This species is chiefly characteristic of the Central region, but occurs 

 in Utah and Arizona, chiefly in the mountains. In our progress south- 

 ward, in the valley of the Rio Grande, the last specimens were seen at 

 Taos on the north side of the Picoris Mountains. On the south side of 

 that range, the Eutcenia marciana appeared for the first time. Here also I 

 saw the first specimens of Crotaphytus coHaris, although it extends north 

 of that latitude on the east side of the Sangre de Cristo Mountains. The 

 Criemidophorm tessellatus began to be abundant in the valley of Taos. 

 The third species of Eutcenia, the E. ornata, began to appear in numbers at 

 San Ildefouso, further south. This is a particularly graceful species, with 

 elegant coloration ; the clear olive is varied on each side by alternating 

 quadrate red spots in two rows, and the dorsal band has a black border. It 

 does not reach so large a size as "the E. marciana, which also exceeds the 

 E. vagrans. Although these species exhibit identical scale-formulae, they 

 are quite distinct in life, so that no person can confuse them. And although 

 the E. vagrans is rather variable, the E. ornata and E. marciana maintain 

 their characters in the region of country where they came under observa- 

 tion. The E. cyrtopsis was not seen. 



BUTAENIA ORNATA, Baird. 



Eutainia, parietalis, SAY, BAIRD & GIRARD, Cat. N. A. Rept., pt. i, Serp., 1853, 28. 

 Entcenia ornata, BD., U. S. & Mex. Bound. Surv., ii, 1859, Rept., 16. COPE, Proc. Acad. 

 Nat. Sci. Phila., 1866, 305-306. Check-List N. A. Batrach. & Rept,, 1875, 41. 



HAB. Valley of the Rio Grande del Norte. 



This species was found tolerably common in Utah in 1872, but, curi- 

 ously enough, has not since been collected by the expedition, until 1874, 



