8J). HTPSIOLENA. 211 



b. Hgr. $ (V. 168 ; C. 39). Mezquital del Oro, Dr. A. C. Duller [C.]. 



Zacatecas. 



c. ? (V. 162 ; C. 61). Jalisco. F. D. Godman, Esq. [P.]. 



4. Hypsiglena discolor. 



Leptodira discolor, Giinth. Proc. Zool. Soc. 1860, p. 317. 

 1 I vp-i-rL-na discolor, Cope, Still. U.S. Nat. Mus. no. 32, 1887, p. 78 ; 

 'h. Biol. C.-Am., Sept. p. 137, pi. xlix. fig. 1 (1894). 



Rostral nearly twice as broad as deep, just visible from above ; 

 iuternasals shorter than the praefrontals ; frontal slightly longer 

 than broad ; loreal as long as deep or slightly longer than deep ; one 

 pne- and two postoculars ; temporals 1 + 2 ; seven or eight upper 

 labials, third and fourth or fourth and fifth entering the eye ; anterior 

 chin-shields as long as or a little shorter than the posterior. Scales 

 in 19 rows. Veutrals 173-180; anal divided; subcaudals 85-89. 

 Above with blackish cross bars separated by pale yellowish-brown 

 interspaces ; upper surface of head dark, nape yellowish ; labials 

 yellowish with blackish sutures ; uniform yellowish white beneath. 



Total length 560 millim. ; tail 155. 



Mexico. 

 a-b. <J (V. 180, 173; C. 85, 89). Oaxaca. M. Sall6 [C.]. (Types.) 



5. Hypsiglena latifasciata. 

 Hypsiglena latifasciata, Giinth. Biol. C.-Am., Rept. p. 138, pi. xlix. 



Rostral nearly thrice as broad as deep, scarcely visible from 

 above; internasals a little shorter than the praefrontals; frontal 

 nearly twice as long as broad, with concave sides ; loreal deeper 

 than long ; one praeocular, with a small subocular below it ; two 

 postoculars; temporals 1 + 2; eight upper labials, fourth and fifth 

 entering the eye ; anterior chin-shields shorter than the posterior. 

 Scales in 21 rows. Ventrals 186 ; anal divided ; subcaudals circa 

 80 (end of tail absent in the specimen). Dark brown above, with 

 ten widely separated whitish cross bands ; head whitish, spotted 

 with brown, except on the occiput ; beneath dirty white. 



Total length 350 millim. 



South Mexico. 

 a. $ (V. 186 ; C. ?). S. Mexico. F. D. Godman, Esq. [P.]. (Type.) 



6. Hypsiglena ornata. 



Comastea ornatus, Bocourt, Bull. Soc. Philom. (7) viii. 1884, p. 141. 

 Hypsiglena ornata, Cope, Bull. U.S. Nat. Mus. no. 32, 1887, p. 78. 



Scaling as in //. torqiiata, but body feebly compressed, vontrals and 

 subcaudals more numerous, rostral smaller, and eye larger. Eight 

 upper labials, fourth and fifth entering the eye. Ventrals 185-189 ; 

 Bubcaudals 84-93. Yellowish above, with a dorsal scries of large 

 brown spots, and smaller spots alternating with them on the sides. 



Total length 260 millim. ; tail "7. 



Isthmus of Darien. 



i- 1' 



