OPHIDIA COLUBRIDAE EUTAENIA MEGALOPS. 615 



stream spread into sluggish lagoons, basking on the floating plants, or swim- 

 ming freely in the water like a Nerodia or Eeginn. Others were taken on 

 the San Francisco Mountains in Arizona. They were all rather small, 

 under two feet in length, and differed much in the coloration of the head, 

 which, in some cases, was pitchy black, contrasting strongly with the brown 

 of the body; in others brown. This difference, however, appears to be for- 

 tuitous, as both kinds were found together, evidently representing but one 

 species. 



?55. Eutaenia macrostemma, Kenn. (teste Cope}. 



Eutccnia macrostcmma, KENN., Proc. Acad. Nat. Sci. Phila., 1860, 331. (?)COPR, Proc. 

 Acad. Nat. Sci. Phila., 1866, 300, 307 (rather var. megalops). 



Dorsal scales in twenty-one rows, the lateral on the third and fourth. 

 Frontal plate longer than the occipital suture. Temporal small, margining 

 only the anterior part of penultimate labial. Post-geneials longer than pre- 

 geneials; superior labials eight ; loreal higher than long. Olivaceous, with 

 one row of small black spots below, and two rows above the lateral stripe. 

 Two small black nuchal spots and a short post-oral pale crescent. (Cope.} 



In the original description, Mr. Kennicott gives the ground color as 

 very dull yellowish-brown ; the dorsal stripe broad, covering nearly three 

 rows of scales, light brownish, but little lighter than the ground color, in- 

 distinctly bordered with black ; the lateral stripe indistinct, dull yellowish- 

 green, and two broken series of indistinct spots along the sixth and seventh 

 rows of scales ; the abdomen immaculate, a varying shade of green ; the 

 head dark-brown above ; the superior labials but little lighter, narrowly 

 black-bordered behind. The type is from the city of Mexico. 



Two specimens from Fort Whipple, identified with this species by 

 Professor Cope. They appear, however, to rather represent the following 

 variety, as the true macrostemma probably does not occur so far north. 



55fl. Eutaenia macrostemma megalops, (Kenn.) 



Eutcenla mcaalops, KENN., Proc. Acad. Nat. Sci. Phila., 1860, 330. 

 Eutcenia macrostemma subsp. megalops, COPE, Check -List, 1875, 41. 



" Form shorter and stouter, with proportionally shorter tail than in E. 

 proxima, which this species resembles. Tail one-fourth of the total length. 

 Eye very large, greater than in E. proxima. First dorsal row of scales broader ; 



