1913.] NATURAL SCIENCES OF PHILADELPHIA. 215 



6.3 mm. interorbital region 3.7 mm., interval between nostrils 1.1 mm. 

 Eye with vertically subelliptic pupil, diameter 1.7 mm., its distance 

 from the mouth .8 mm. Maxillary bone with 33 teeth; reaching 

 beyond the palatine. Ectopterj'goid bone short, ectopterygo- 

 maxillary joint at the level of the second, and ectopterygo-pterj-goid 

 joint at the level of the seventh tooth on the pterygoid bone. Pala- 

 tine bone Avith 20 teeth; no vomerine process; maxillary process a 

 broad elongate shelf extending back to the level of the 13th tooth, 

 at the articulation with the maxillary bone its external edge is incisetl, 

 before and behind the joint an externally directed process; on the 

 under surface of this shelf at the base of each process is a foramen, 

 these are the entrance and the exit to a canal which perforates the 

 bone and gives passage to a branch of the palatine artery; palato- 

 pterygoid joint oblique from within out, the posterior tip of the 

 palatine bone reaching to the level of the last tooth on the maxilla. 

 Pterygoid bone with 30 teeth which extend to within 1.1 mm. of the 

 posterior tip of the bone. Apex of the heart at the level of the 37th 

 gastrostege, eciuivalent to 22.7% down the spinal column. No 

 rudimentary right lung or extension of the pulmonary tissue along 

 the trachea. Liver extends from the 45th to the 88th gastrostege. 



Habits. — The stomach contained an earthworm belonging to the 

 family Perichaiidoe. 



Habitat. — Recorded from Luzon, Samar, Leyte, Calamianes, 

 Dinagat, and Mindanao. 



Lystrophis semicinctus (Dumeril and Bibron). 



No. 14,571 Cal. Ac. Sci. (Purchased.) Tucuman, Argentine. 

 Male; total length 455, tail 63 mm. 



Squamation. — Scales in 21 rows anteriorly, reduced to 19 and 17 

 posteriorly ; the sequence of suppression is the V row followed by the 

 IV row; the gastrostege level at which the rows terminate is nearly 

 the same on each side: 



each scale is smooth, and with a single apical pit; the lateral and 

 dorsal scales are elongate, and in very oblique transverse series, the 

 tip of each is well anterior to the middle of the scale below and behind 

 it ; the scales in the first to the fifth rows are broad, not in markedly 

 oblique series, the tip of each scale is anterior to the centre of the 

 15 



