1913.] NATURAL SCIENCES OF PHILADELPHIA. 79 



Oxyrhopus trigeminus Dumeril and Bibron. 



1896: Boulenger, Cat. Sn. Brit. Mus., Ill, p. 104. 



Field No. 4,425. Ceara Mirim, Rio Grande do Norte, Brazil. 

 Female; total length 340 mm., tail 55. 



Scales in 19 rows anteriorly and 17 rows posteriorly; the IV row 

 suppressed at the level of the 126th gastrostege on the right and the 

 127th on the left; smooth, with two apical pits; the scales in the 

 outer row are usually without pits, when present there is one situated 

 in the upper half of the scale and near the apex. Gastrosteges 191; 

 anal entire; urosteges 60 pairs. One prse- and two postoculars; 

 temporals 2-3; eight upper labials, the fourth and fifth entering the 

 eye. The pupil is very narrow and vertical. 



Anatomy. — The maxilla bears ten teeth and two enlarged fangs. 



Color. — There are thirteen sets of bands on the body and three 

 on the tail, the tip is black. 



Field No. 4,449. Papery, Rio Grande do Norte, Brazil. Female; 

 body 471 mm., tail docked. 



Scales in 19 rows anteriorly and 17 rows posteriorly; the IV row 

 is suppressed at the level of the 120th gastrostege on the right and 

 on the 122d on left side. Gastrosteges 183; anal entire. One 

 prae- and two postoculars temporals 2-3; eight upper labials, the 

 fourth and the fifth entering the eye. 



Field No. 4,402. Papery, Rio Grande do Norte, Brazil. Male; 

 body length 437 mm., tail docked. 



Scales in 19 rows anteriorly and in 17 rows posteriorly; the IV 

 row is suppressed at the level of the 118th gastrostege on the right 

 and at the 119th on the left side. Gastrosteges 182; anal entire. 

 One prse- and two postoculars; temporals 2-3; eight upper labials, 

 the fourth and fifth entering the eye. 



Anatomy. — The total length of the hemipenis is 22 mm., it is 

 divided, the length of each quadripenis being 9 mm., the tip reaches 

 to the 12th urostege. The sulcus is divided 6 mm. from the base; 

 each quadripenis terminates in a cordiform apical disk; from the base 

 to the bifurcation of the sulcus the organ is plicate, from this point 

 to the chsk it is spinous. A rudiment of a lung. The heart apex 

 is at the level of the 41st gastrostege. Anteriorly the liver is divided 

 into two lobes, the one on the right side is 8 mm., that on the left 

 24 mm. long; the tip of the longer lobe is at the level of the 51st 

 gastrostege. 



