38. HYPSIGLENA 



Hypsiglena ochrorhyncha var. chlorophcea Cope, Proc. Acad. Nat. Sci. 



Phila., 1866, p. 304; Cope, Bull. U. S. Nat. Mus., No. i, 1875, 



p. 38; CouES, Surv. W. looth Merid., Vol. V, 1875, p. 622; Yarrow, 



Bull. U. S. Nat. Mus., No. 24, 1883, pp. 15, 97; Garman, Mem. Mus. 



Ccmpr. Zool., Cambr., Vol. VIII, No. 3, 1883, p. 161. 

 ? Hypsiglena texana Stejnecer, N. Amer. Fauna, No. 7, 1894, p. 205 



(type locality, between Laredo and Camargo, Tex.); Strecker, 



Baylor Bulletin, Vol. XVIII, No. 4, 1915, p. 40. 

 Hypsiglena venusta Mocquard, Nouv. Arch. Mus. Hist. Nat., Paris, 



Ser. 4, Vol. I, 1899, p. 327 (type locality, Santa Rosalia and San 



Ignacio, Lower California, Mexico). 

 Hypsiglena ochrorhynchus ochrorhynchus Stejnecer & Barbour, Check 



List N. Amer. Amph. Rept., 1917, p. 93; Van Denburgh & Slevin, 



Proc. Cal. Acad. Sci., Ser. 4, Vol. XI, 1921, pp. 28, 52, 68. 

 ? Hypsiglena ochrorhynchus texana Stejnecer & Barbour, Check List 



N, Amer. Amph. Rept., 1917, p. 93. 



Description. — Head flat-topped or slightly rounded, and 

 snout projecting. Temporal regions usually swollen. Rostral 

 plate large, prominent, recurved on top of snout, and 

 bounded behind by intcrnasal, anterior nasal, and first labial 

 plates. Plates on top of head are a pair of internasals, a 

 pair of prefrontals, a frontal, supraocular of each side, and 

 a pair of rather short, rounded parietals. Anterior and 

 posterior nasals usually distinct, but sometimes united above 

 nostril. Loreal small, but often elongate. Two (or one or 

 three) preoculars, the lower often very small. Two post- 

 oculars. Temporals normally one followed by two, rarely 

 2+2, or 1 + 1. Eight (rarely seven or nine) superior and 

 ten (or nine) inferior labials, sixth or seventh superior and 

 fifth or sixth inferior largest, fourth and fifth or fifth and 

 sixth superior reaching eye, first pair of inferior meeting 

 on median line. Genials in two pairs, posterior equal to or 

 a little larger or smaller than anterior. Scales on body 

 smooth, thin, in 21 or rarely 23 rows. Anal plate divided. 

 Gastrosteges varying in number from 160 to 191. Urosteges 

 in two series of from 38 to SS. 



