608 ZOOLOGY EBPTILES AND BATRACHIANS OF ARIZONA. 



Rattle and rostral plates as in C. lucifer. Dorsal rows, 25 ; superior 

 labials, 16 ; 3-4 rows of interorbital scales, bounded in front by two 

 shields. Yellow stripe from eyebrow above rictus oris. Yellowish-brown, 

 with a dorsal series of truncate, brown, yellow-edged rhombs ; tail black- 

 ringed. (Kenn.} 



Specimen in my collection from the San Francisco Mountains, July, 

 1864. Twenty inches long. 



44. Caudisona tigris (Kenn.) Cope. 



Crolaliis tigris, KENN., MSS. BD., U. S. & Mex. Bound. Surv., ii, pt ii, 1859, Reptiles, 

 14, pi. 4 (Gila and Colorado, A. Schott). COPE, Check-List, 1875, 33. 



Caiidinona tigris, COPE, Mitchell's Res., 1861, 122. Id., Proc. Acad. Nat. Sci. Phila., 

 1866, 309. 



Body slender ; head small, very much depressed, narrow behind ; 

 nose remarkably broad and obtuse ; whole outline of head nearly quad- 

 rangular. Superciliaries and frontals smooth ; space between supercili- 

 aries very wide ; 4 frontals ; 6 post-frontals ; two rows of scales between 

 suborbital chain (which is complete) and the labials. Labials 14 above; 

 14-15 below. Dorsal rows 21-23 ; very slightly carinated. Dorsal scales 

 broad, rounded behind. Color yellowish-ash above, with rather small, 

 indistinct, dorsal brown blotches anteriorly ; two posterior thirds of body 

 banded with brown. (Kennicott.') Rattle acuminate ; rostral plate equi- 

 lateral, broad, depressed. (Cope.} 



This species, which was not met with by me, occurs in the deserts of 

 the Gila and Colorado Rivers. 



45. Caudisona pyrrha, Cope. 



PLATE XXII. 



Caudinona pyrrlia, COPE, Proc. Acad. Nat. Sci. Phila., 1866, 308, 310 (type No. 6606, 



Mus. Smiths. Inst., Arizona, near Fort Whipple, coll. Cones). 

 Crotaliis pyrrhus, COPE, Check-List, 1875, 33. 



DIAG. Scales in twenty-five series, broad and rounded ; the two infe- 

 rior rows smooth. Head short and very obtuse; the nostrils opening sub- 

 vertically. Superior labials higher than long; three rows of temporals 

 smooth; scales of vertex small, keeled; those more anterior, striate. Super- 

 ciliaries broad, oval, striate. Canthus rostralis none. Inferior labials fit- 



