ART. 24 SOUTH AMERICAN SNAKES AMAEAL 9 



41. PETALOGNATHUS NEBULATUS (Linnaeus) 



Coluber nebulatus Linnaeus, Syst. Nat., ed. 10, vol. 1, 1758, p. 222. 

 Petalognathus nebulatus Dumeril and Bibron, Erp. Gen., vol. 7, 1854, p. 

 464. — BouLENGER, Cat. Snakes Brit. Mus., vol. 2, 1894, p. 293. 



Dutch Guiana. — 1 specimen, No. 11,146, collected by C. J. Her- 

 ing; V, 175, c. 90 pair, lab. 7 (4th and 5th), postoc. 2; chin-shields, 

 3 pairs. 



Ecuador. — 2 specimens, No. 14,035, collected by Dr. W. H. Jones: 

 V. 191, c. 70 pair, lab. 7 (4tli and 5th), postoc. 2; chin-shields 3 

 pairs; No. 14038, collected by Mr. Wachusett: v. 193, c. 79 pair, 

 lab. 7 (4th and 5th), postoc. 2; chin-shields 3 pairs. 



42. SIBYNOMORPHUS MACROSTOMUS Amaral 



Sibynomorphus macrostomus Amaral, Journ. Washington Acad. Sci., vol. 14, 

 1924, no. 9, p. 200. 



Ecuador. — 1 specimen. No. 14,047 (Type). 



43. SIBYNOMORPHUS MIKANU (Schlegel) 



Dipsas mikanii Schlegel, Physiogn. Serp., vol. 2, 1837, p. 277. 

 Leptognathus viikani Boulenger, Cat. Snakes Brit. Mus., vol. 3, 1896, p. 



453. 

 Leptognathus peruanus Boettger, Kat. Rept. Mus. Senckenberg., 1898, 



pt. 2, p. 128. 

 Sibynomorphus mikani Ruthven, Miscell. Publ. Univ. Michigan Mus. 



Zool., vol. 8, 1922, p. 69. 



Ecuador. — 7 specimens, collected in Guayaquil by F. W. Goding. 



Peru. — 1 specimen, collected in Puquiura, by E. C. Erdis, in June, 

 1915, and referred to S. 'peruanus by Barbour and Noble.^ 



The examination of this series suggested a comparative revision 

 of the species S. mikanii and S. peruanus (type from Santa Ana, 

 Cuzco, Peru) which Boettger considered a valid form, differing es- 

 pecially in coloration, (belly, head and lips), number and disposition 

 of upper labials, size of internasals, its formula being: sc. 15; v. 

 180; a. 1; c. 79 pairs plus 1; lab. 8 (3, 4, 5); temp. 2-f-3; 4 pairs 

 of chin-shields, anterior much longer than broad. The examination 

 of the specimen in the United States National Museum and another 

 series in the Museum of Comparative Zoology yielded the following 

 figures and data: 



« Proc. U. S. Nat. Mus., vol. 58, 1920, p. 620. 

 53649— 25t 2 



