CROCODILIANS, LIZARDS, AND SNAKES. 1049 



As the locality fioin wbicli tlie type was. brought is not far from 



the United States and Mexican boundary, I retain it in the present 



work. 



EUTiENIA EQUES Reuss. 



Cohiher cquen Ekuss, Mus. ScMickenb., I, 1834, j). 152, pi. viii, lig. 2. 



EnUvnin cyrtops'iH Kennicott, Proc. Acad. Nat. Sci. Pbila., 1860, p. 333. — Copk, 



Proc. Acad. Nat. Sci. Pliila., 1866, p. 306 ; Wheeler's Kept. U. S. Surv. W. 100th 



Mer., V, 1875, p. 546 ; Bull. U. S. Nat. IsUxs., No. 17, 1880, p. 23 ; Proc. U. S. Nat. 



Mus., XIV, 1892, p. 656. 

 lliiimuophh cyrtopsis var. cyclides Cope, Proc. Acad. Nat. Sci. I'liila., 1861, p. 299. 

 Tropidonotiix collar is J AS, Arch. Zool. Aiiat. Phys., Ill, 186.5, p. 209; Icon. Gon,, 



1867, Pt. 25, pi. V, fig. 2. 

 Eiilwiiia ci/rtopxis oceUata Cope, IJull. U. S. Nat. Mas., No. 17, 1880, p. 22. 

 TropitlonotiiH ,sir/a/)s var. collaris Garman, N. Aiiicr. Kept., 1883, p. 25. 

 Entwnia collaris CoPE, Proc. Amer. Phil. Soc, XXII, 1884, p. 173. — DiJ(;i:s, La 



Natiiralcza (2), I, 1888, p. 127, pi. xiii, fig. 16. 

 Tropidonotus ordinaius D. var. cqiies Bori.ENGER, Cat. Snakes Brit. Mus., I, 1893, 



p. 209. 



Head wide, very distinct; body slender. Scales in nineteen rows, 

 rather narrow; the lirst as deep as long, wealily keeled; the second 

 intermediate in form between the first and third; remainder rather 

 narrow, not emarginate. Superior labials eight. Loreal as high as 

 long; oculars 1—3. Temporals in type 1-3-3; in a second specimen 

 from the same region 1-2-3 on one side, and 1-2-1 on the other. Tail 

 varyin,g in length according to the subspecies. Frontal plate not wider 

 than the superciliaries. P^yes large, muzzle short. 



Ground color above, light reddish brown; below, pale green. Three 

 longitudinal stripes above, the median narrow more or less of its length 

 on one row of scales, the lateral on the second and third row of scales. 

 Two rows of black spots occupy the space between the stripes. These 

 spots generally combine into a single row of large spots on the anterior 

 parr of the body, but do not in one specimen (Cat. No. 80G7, the type). 

 They also frequently join at their angles, forming a zigzag black band. 

 A row of large Jet-black spots below the lateral stripe alternates with 

 the spots of the inferior row. Belly immaculate. 



This well marled species has the slenderness of body, and in one 

 form the length of tail, of the Euiwnia ])rox'nn(t, but it has a head and 

 scales of the K. eleg<(ns tyi)e. It is characterized by the narrowness of 

 the dorsal stripe, together with the huge black nuchal spots. 



It is represented by four subspecies, which differ as follows: 



I. Dorsal strij)e on three rows of scales on anterior half of body. 



Stripes yellow, not black borden'd. No conspicuous sjjots below lateral stripe. 



E. e. a II rata. 



II. Dorsal stripes on one row of scales only. 



It Tail al)()ut one-third the total length. No large spots below lateral stripe. 



Dorsal stripe- on one row of scales K. r. eipies. 



(ta Tail between one fourth and one-fifth the length. 



Large sjjots below lateral 8tri))e alternating with lower lateral spots, and 



invading lateral stripe E. e. collaris. 



No large spots below lateral stripe; stripes yellow, dorsal on three rows. 



jE. c. aurafa. 



