10. TEOPIBONOTTTS. 237 



S-. $(Sc.23; V.155;C.53). Hamman R'irha, Dr. J. Anderson [P.]. 



Algeria. 



r-s. Yg. (V. 153, 150 ; 0. St. Barbe, Algeria. Dr.R.Blanchard [P.]. 



56,60). 



t. $ (V. 153 ; 0. 50). Biskra. 



M. Yg. (V. 152; 0. 52). Tufrgurt, Algerian Dr.R.Blanchard [P.]. 



Sahara. 



v-y. 2 (V. 152, 154; 0. 50, Tunis. Mr. Fraser [0.1. 



47), hgr. ? (V. 151 ; 0. 



50) &r7g.(V.147;C.57). 



z. 2 (So. 23 ; V. 157 ; 0. N. Africa. Zoological Society. 



68). 



a. SkulL Algeria. 



B. Two yellow or reddish longitudinal dorsal lines in addition to 

 the usual markings. {N. ocellata, Wagl., G. aurolineatus, Gerv., 

 T. oppelii, Boie, T. ehersoides, D. & B.) 



a. Hgr. cJ (V. 149 ; 0. ?). Mountain streams of Col. Irby [P.]. 



Algeciras. 



b. (S (V. 155 ; C. 72). Alemtejo, Portugal. Dr. H. Gadow [0.1. 



c. 2 (V. 154 ; 0. 53). Tangier. Mr. Fraser [0.]. 



d. Yg. (V. 157 ; 0. 62). St. Barbe, Algeria. Dr.R.Blanchard [P.]. 



e. ? (V. 153 ; 0. 49). Tunis. Mr. Fraser [0.]. 



/. d (V. 154; C. 59). Duirat, Tunisia. Dr. J. Anderson [P.]. 



37. Tropidonotxis validus. 



Regina valida, Sennicott, Proc. Ac. Philad. 1860, p. 334 ; Cope, Bull. 



U.S. Nat. pRis. no. 32, p. 74 (1887). 

 Tropidonotus celssno, Cope, Proc. Ac. Philad. 1860, p. 341, and 1861, 



p. 298. 



tephropleura. Cope, II. cc. 



validus. Cope, I. c. p. 842 ; Coues, Wheeler's Rep. Surv. W. lOOiA 



Mer. T. p. 612, pi. xxi. (1875). 

 quadriserialis, Fischer, Verh. nat. Ver. Hamb. (2) iii. 1879, p. 82, 



pi. i. fig. 2. 



leberis, var. validus, Oarm. N. Am. Pq)t. p. 28 (1883). 



sirtalis, var. quadriserialis, Garm. I. c. p. 140. 



Regina quadriserialis, Cope, Bull. U.S. Nat. Mus. no. 32, p. 74 



(1887). 

 Natrix valida. Cope, Proc. U.S. Nat. Mus. xiv. 1892, p. 670. 



Eyes rather small. Rostral broader than deep, visible from 

 above ; nasal usually semidivided ; internasals much narrowed 

 in front, longer than broad, as long as or a little shorter than 

 ' the prsefrontals ; frontal twice as long as broad, as long as its 

 distance from the end of the snout, shorter than the parietals ; 

 loreal as long as deep, or longer ; one or two pree- and three 

 (rarely two) postoculars ; temporals 1 + 2 or 1 + 3 ; eight upper 

 labials, fourth and fifth entering the eye; five lower labials in 

 ' ' • contact with the anterior chin-shields, which are a little shorter 

 than the posterior. Scales in 19 (rarely 21) rows, outer row 

 faintly keeled. Ventrals 136-147 ; anal divided ; subcaudals 

 66-83, Greyish or olive-brown above, uniform or with longi- 



