NATURAL SCIENCES OF PHILADELPHIA. 109 



labials ; black with nearly equal yellow annuli ; not com- 

 plete on belly fasciata. 



Head short, broad ; scales in seventeen rows, the three me- 

 dian only keeled ; one preocular, loreal reaching orbit, 

 two postocnlars, tliree pairs genials ; six superior, nine 

 inferior labials ; black with narrow yellow rings, yellow 



scales, black tipped sartorii. 



The seven groups of this genus do not represent genera, but rather sections, 

 for the following reasons. The vertebral series of dorsal scales is so reduced 

 in L. o r e a s Cope, as to constitute it a link between the two types in this re- 

 spect. The keels are so weak in L. sartorii Cope, and the allied L. a n th r a- 

 cops Cope being smooth, this character appears to have no more than spe- 

 cific value. The elongate pregenials, appear to constitute a strong distinction, 

 but in one of our numerous L.nebulata they are divided as in other species. 

 Lastly, the peculiarity of the junction of two inferior labials is less to be relied 

 on, in view of the fact fliat in one of our L. bu c e p h a 1 a there is one on one 

 side and two on the other in front of the genials. 



Leptognathus catesbyi Giinther, Coluber Weigel, Slremmatognathus D. B. 

 Apparently abundant on the Napo and Upper Maranon. 



Leptognathus oreas Cope, sp. nov. 



Body less compressed ]iosteriorly than anteriorly. Frontal plate broader 

 than long, very obtuse behind. Occipitals 1-75 times longer, narrowed and 

 divergent behind. Temporals one large anterior higher than long, in contact 

 with both postoculars ; two broad ones, lower joining last labial, then a row 

 of four. Four anterior labials not narrowed, third, fourth and fifth entering 

 the orbit ; the three last longer than high. 



Dorsal band wider anteriorly, approaching on the sides ; behind they are 

 not all continuous, but alternate on the sides, then also the light intervals are 

 much obscured, no black collar. Chin and throat yellow. An irregular black 

 yellow edged band on each side of head from behind occiptals to middle of 

 superciliaries ; other head plates witli similar black margins. Upper labials 

 yellowish, with a black line from loreal plate, one from orbit, and a broad one 

 over last labial, including two last lower labials. Belly largely obscured with 

 black. 



Gastrosteges 180, anal 1 ; urosteges 90. 



Total length 26 in. ; of tail 7 in. ; of gape of mouth 8 lines. 



From the elevated valley of Quito. (No. 6707.) 



Leptognathus NEBULATA Giinther, Jan. Coluberhinn. Dipsas SithXeg. Feta- 



lognathus Dum. Bibr. 



No. 6708 from the valley of Quito. 



This species is the most extensively distributed of the genus. It ranges 

 from the Tierra Caliente of Vera Cruz (Suraichrast) to Nicaragua (Caldwell) 

 to Caraccas (Ashmead) and Dutch Guiana (Hering) ; according to Giinther 

 from Pernambuco. 



Himantodes cenchoa L., D. and B. 

 Napo and Maranon. No. 6670. 



Leptodira anndlata Linn., Fitz. 

 Napo and Maranon, and Guayaquil. 



rROTEROGLYniA. 



Pelamis bicolor. 



From Guayaquil and Panama, apparently not rare. 



Elaps lemniscatus Linn. 

 Guayaquil, (6685.) 



1868.] 



