NATURAL SCIENCES OF PHILADELPHIA. 65 



bits. There are large yellow spots on the frontal and snpercilia- 

 ries, and the prefontals and labials are yellow-black bordered. 



Masticophis pulcherrimus, sp. nov. 



Scales in quincunx, in seventeen subeqnal series, all smooth, 

 many of them with two apical pores. Teeth subequal, without 

 noticeable diastemata. Form very slender ; tail one-third the total 

 length. Gastrosteges weakly angulated, anal divided. Head flat, 

 rostral low ; loreal twice as long as high ; prefontal not reaching 

 frontal, which is quite narrow ; occipitals wide oval. Temporals 

 2-2-1-2 and 2-1-1-2. Superior labials nine, fourth, fifth, and 

 sixth bounding orbit. Geneials slender. Total length m. .875 ; 

 tail .285 ; gastrosteges .205 ; urosteges .152. 



Ground color clay-white; a black band occupying two and two 

 half rows of scales extends on each side from the orbit to the 

 end of the tail. The dorsal interval is one and two half scales in 

 width, and was j-ellowish or reddish in life, except anteriorly, 

 where it is an emerald-green. This brilliant color extends over 

 the entire top of the head. Lips white. 



This species is as slender as, and is partially colored as, some of 

 the tree-snakes of the genus Ahsetulla. From a small collection 

 made on the "western side of Central America" by Prof George 

 Davidson, which also contains EJcrps viigrocinctus, Gir., Trimor- 

 phodon major, Cope, Boa eques Eyd-Soul. 



Oxybelis acuminatus, Wied. 



Ahaetulla bilineata, Gthr. Diplotropis Ulineatus Gthr. Ann. Magaz. Nat. Hist., 



1872, p. 24. 

 Ahsetulla mexicana, D. B. 

 Leptodira annulata, L. var. 

 Dipsas cenchoa, L. 

 Leptognathus atypicus, sp. nov. 



Belonging to sec. vi. of my monograph of this genus,^ that is, 

 with smooth equal scales, and short geneials separated b^' but 

 one pair of labials from the syniphyseals. The body is rather 

 stout, and, unlike most of the genus, nearl^^ cylindric ; the neck 

 is not contracted, but the head is wide and flat, and the muzzle 

 short. Scales rather wide; in fifteen rows. Kostral plate subtri- 

 angular; a subquadrate loreal; no preocular; postoculars 2; tem- 

 porals 2X3. Frontal and parietals broad and short, the latter 

 truncate. Superior labials six, eye over third and fourth, fifth 



' Proceed. Acad. Nat. Sci. Phila., 1868, p. 107. 



