SYNOPSES AND DESCRIPTIONS. 95 



XlXtA LIEBMANNI. 

 Ciiersodromi-s i.iKHMAx.M Rei nhardt, I860, Vidensk, Meddel, Kjobenh., 242. 



Head little larger than the neck; muzzle broad. Habit similar to other 

 species of this genus. Prefrontals united, entering orbit. Internasals 

 separate. Nasal divided. Loreal and anteorbital united. Postorbitals 

 and supraocular united. Frontal broad. Temporals 1+2. Labials seven, 

 third and fourth in orbit. Infralabials eight, fifth largest. Scales keeled, 

 in 17 rows. Ventrals 130. Subcaudals 42 pairs. 



Brown, with a transverse band of light color across the parietals. 

 Mexico. 



NlNIA SEBAE. 

 Ptreptopiiorus sebae Dum. <Se Bibr., 1854, Erp. Gin. VII, 515. 

 Ninia sebae Cope, 18G0, Pr. Ac. N. Sc., Phil., 340 {name). 



Of moderate size, subcylindrical, belly broad; head rather distinct from 

 the neck, crown convex, muzzle broad and rounded; tail short, tapering, 

 slender posteriorly. Eye small, pupil round. Head-shields nine. Ros- 

 tral small. Internasals and supraoculars very small. Frontal short, 

 broad. Prefrontals nearly as large as frontal, entering the orbit. Parie- 

 tals large. Nasal in two parts, nostril between. Loreal large, fused with 

 anteorbital. Postorbitals two, lower small. Temporals 1+2. Labials 

 seven, third and fourth in orbit, the former extended backward to reach 

 it. Infralabials seven, fourth large. Submentals two, anterior twice as 

 large as posterior, not in contact with the mental. Scales keeled, in 17 

 or 19 rows, outer broad. Ventrals 14(3 to 151. Anal entire. Subcaudals 

 5H to 64 pairs. 



Brownish white, scales tipped with dark. A row of small black spots 

 on each side of the back. Head-shields black; labials more or less 

 margined with the same color. Separated from the black of the head by 

 about three scales there is a black collar on the neck, varying in length, 

 extending to the outer rows of scales. Belly and labials glossy yellowish- 

 white. Total length 11| inches; tail 2| inches. Mexico and Central 

 America. 



Nix IV COLLARIS. 

 Streptophorus sebae var. collaris Jan., 1865, Icon. Ophid. I.irr. 12, pi. Ill, fig 6. 



Differs from N. sebae in that it has no spots behind the broad collar on 

 the neck, and in the punctulations on the hinder part of the abdomen. 

 A variety of N, sebae.. 



