92 PROCKEDIXGS OF THE ACADEMY OF [Jau., 



Grayish or yellow above, Avith dark-brown saddle-shaped spots, 

 six or eight scales long and nearly reaching the ventrals; belly 

 yellowish; top of head and part of the upper labials light brown 

 with blackish markings; an indistinct pale band aci'oss the nape. 



Hab. — Texas to Arizona ; northern Mexico. 



ERYTHROLAMPRUS Waglcr. 



Syst. Araph., 187(1830) ; Cope, I. c, 676 ; B3ul., I. c, III, 199 ; Conio- 

 phanes Cope, Rep. Nat. Mus., 1096. 



Posterior maxillary teeth elongated, grooved and separated by 

 an interspace; 1 loreal; 1 or 2 preoculars; 2 nasals; pupil round; 

 scales smooth, without pits, in 15-25 rows; anal divided; size 

 moderate. 



Hab. — North and South America. 



Erythrolamprus imperialis Baird. 



TcmiiopJiis imperMis Baird, U. S. Mex. Bound. Surv., II, 23, PI. XIX, 

 fiw. 1 ; B. imperidlis Cope, I. c, 676 ; Boul., I. c, III, 206 ; Gonio- 

 phanes imperialis Cope, Rep. Nat. Mus., 1097. 



Head not very distinct; size small; head shields normal; 2 

 nasals; 1 loreal; oculars 1-2; temporals 1-2; upper labials 8 (7); 

 scales in 19 rows; ventrals 120-143; subcaudals 67-94. Length 

 about 410 mm. (tail IGO). 



Light brown, with a blackish vertebral stripe, and one on each 

 side; scales below the lateral stripes pale brown; a yellow line with 

 black edges from nostril to temporals; upper labials whitish, dotted 

 with black; belly reddish, sometimes with black dots. 



Hab. — Southern Texas to Central America. 



TANTILLA B. and G. 



I. c, 131 ; Cope. I. c, 597, and Rep. Nat. Mus., 1110 ; Uomalocranium^^ 

 Boul., I. c. III, 213. 



Posterior maxillary teeth slightly elongated, grooved and sepa- 

 rated by an interspace; no loreal; 1 preocular; 2 nasals: 2 inter- 

 nasals; scales smooth, without pits, in 15 rows; anal divided; size 

 small ; head flat and not very distinct. 



Hab. — North and South America. 



^' Tantilla is preferred to Homalocranium for the reasons given under 



Stoi'ena. 



