204 C0LtrjJEIDJ3. 



visible from above ; internasals broader tban long, sborber than tbe 

 prefrontals ; frontal hardly once and a half as long as broad, a 

 little longer than its distance from the end of the snout, slightly 

 shorter than the parietals ; loreal trapezoid, as long as deep ; 

 one prae- and two or three postoculars ; temporals 1+2; seven 

 upper labials, third and fourth entering the eye ; four lower labials 

 in contact with the anterior chin-shields, which are shorter than 

 the posterior. Scales in 19 rows, very strongly keeled, outer row 

 perfectly smooth, second row feebly keeled. Ventrals 141-158 ; anal 

 entire ; subcaudals 46-56. Brown above, scales of the vertebral 

 series yellow ; a rather ill-defined light lateral streak ; regular dark 

 brown cross bars between the light stripes ; head with dark brown 

 symmetrical markings ; a yellowish streak from the parietals to 

 the angle of the mouth ; upper lip yellow, the shields edged with 

 black ; greyish olive interiorly, ventrals blackish at the base. 



Total length 370 millim. ; tail 65. 



Mexico. 



a. $ (V. 141 ; 0. 46). City of Mexico. Mr. Doorman [0.]. 



b. <S (V. 158 : C. 56). S. Mexico. F. D. Godman, Esq. 



[P.]. 



5. Tropidonotiis scalaris. 



ThfimnopMs scalaris, Cope, Proc. Ac. Philad. 1860, p. 369. 

 Eutaenia scalaris. Cope, Proc. Ac. Philad. 1866, p. 306. 



Head narrow, scarcely distinct from neck ; eye rather large. 

 Eostral broader than deep, visible from above ; internasals broader 

 than long, shorter than the praBfrontals ; frontal twice to twice and 

 one fourth as long as broad, much longer than its distance from 

 the end of the snout, slightly shorter than the parietals ; loreal as 

 long as deep or a little deeper than long ; one prae- and two or 

 three postoculars ; temporals 1 -t- 2 ; seven upper labiah, third and 

 fourth entering the eye ; four lower labials in contact with the 

 anterior chin-shields, which are shorter than the posterior. Scales 

 in 19 rows, strongly keeled, outer row smooth or faintly keeled. 

 Ventrals 130-145 ; anal entire ; subcaudals 52-75. Brown above, 

 with a yellow or orange vertebral line, and a light lateral streak 

 on the second or second and third rows of scales ; blackish-brovirn 

 cross bars disposed regularly between the light stripes ; greyish 

 olive or plumbeous grey inferiorly. 



Total length 550 millim. ; tail 125. 



Mexico. 



a. S (V. 130 ; 0. 75). Oaxaca. Mr. Hoege [C.]. 



h-d, e. c? (V. 141, 140 ; La Cumbre de los An-as- Dr. A. C. BuUer 



C. 63, 71), hgr. $ (V. trados, Talpa Mascota, [0.]. 



143; 0. 57), & yg. Jalisco. 



(V. 139 ; C. 62). 



f-h. d- (V. 139, 140 ; 0. Colonia Brizuela, Hda. El Dr. A. C. Buller 



65, 65) & 2 (V. 145 ; Eosario, Autlan, Jalisco. [C.l. 



C. 61). 



