216 PROCEEDINGS OF THE ACADEMY OF [April, 



scale that is below and behind it. Gastrosteges 156. Anal divided. 

 Urosteges 34 pairs, the second to the seventh and the ninth entire. 

 Rostral reaching to the azygos prefrontal, separating the internasals 

 and lateral prefrontals, above with a sharp median keel, anterior 

 inferior surface flat, inclined upward at an angle of 45°, and bordered 

 by a sharp edge. Frontal with a small incisure from the middle of 

 the anterior border. Preoculars 2, postoculars 2. Anterior tem- 

 porals 2, posterior 2. Supralabials 8, the fourth and fifth entering 

 the eye. Infralabials 11, the first pair broadly in contact. Anterior 

 geneials three times the size of the posterior; touching five labials. 



Anatomy. — Posterior vertebrae with a low rounded keel. Maxillary 

 with 5 small teeth gradually increasing in size posteriorly; these 

 followed by a space that would support two more ; behind 2 enlarged 

 teeth situated below the posterior rim of the pupil, a trifle longer than 

 the space, curved, and with a sharp cutting edge behind. Palatine 

 with 5 teeth ; tip of bone reaching to the interval between the second 

 and the third maxillary tooth. Pterygoid with 12 teeth; pterygo- 

 palatine joint at the interval between the enlarged maxillary teeth. 

 Dentary with 14 equal teeth. Heart far forward, apex opposite the 

 26th gastrostege, in terms of body vertebrae this is 16.7% do^\Ti the 

 column. Left lung begins abruptly at the base of the ventricle, 

 without free apex or extension of the pulmonary tissue along the 

 trachea. Liver extending from the 36th to the 64th gastrostege. 

 Hemipenis 20 mm. long, divided, sulcus furcate, spinous, and with an 

 apical disk. Compared with the figure of the organ in L. dorhigny 

 (Dumeril and Bibron)^ this form is less deeply divided, the divisions 

 reaching to one-third, instead of one-half the distance from the tip 

 of the organ to the bifurcation of the sulcus, the apical disk is larger 

 and with a wider free border. Eye 2.5 mm. in diameter, its distance 

 from the mouth 3.3 mm. 



Oligodon vertebralis Giinther. 



No. 15,808 Cal. Ac. Sci. Coll. A. Seale, Esq. Puerto Princesa, 

 Palawan, P. I. Female; total length 159, tail 24 mm. 



Squamation. — Scales in 15 rows, finely striate, without keels or 

 pits. Gastrosteges 139. Anal divided. Urosteges 36 pairs. Ros- 

 tral one and one-half times broader than long, portion seen from above 

 two-thirds its distance from the frontal. Suture between the inter- 

 nasals twice as long as that between the prefrontals. Frontal one- 



1 1900: Cope, Croc, Liz., Sn. No. Am., Repl. U. S. Nat. Mm., 1898, PI. XXIV, 

 fig. 6. 



