3. AlIPHISB^NA. 443 



twelve to eighteen above and sixteen to twenty-two below the 

 lateral lines. Anal segments six or eight. Occipitals frequently 

 broken up, not distinguishable from the surrounding plates. All 

 the specimens in the collection have four prajanal pores, but they 

 are frequently hardly visible. Colour cither uniform brown above 

 and yellowish beneath, or checked with dark brown on yellowish 

 ground, in which case a light collar may be apparent. 



millira. 



Length to vent 3G0 



Tail (injured) 23 



Diameter of body IG 



South Brazil, Paraguay, Uruguay, Buenos Ayres. 



a-d,e. Ad. & yg. (A. 184- Rio Graude do Sul. Dr. v. Ihering [C.]. 



200+11-25). 



/-/. Ad. & bgr. (A. 182- S. Lorenzo, Rio Dr. v. Iheriug [C.]. 



188+9-27). Grande do Sul. 



m. Ad. (A. 190+23). Montevideo. Zoolcg. Soc. 



n-q. Ad. (A. 183-190+ Uruguay. 



9-25). 



r. Ad. skeleton. Uruguay. 



s. Ad. (A. 200+19). Buenos Ayres. E. W. White, Esq. [C.]. 



10. Amphisbsena albocingulata. 



Amphisbsena albocingulata, Buetty. Zcit&chr.f. Naturw. Iviii. 1885, 

 p. 215. 



Distinguished from A. darwinii by the presence of four prae- 

 frontals, a smaller anterior and a larger posterior pair, and by the 

 presence of a more or less distinct praocular. Annuli 190 + 27. 



Paraguay. 



11. Amphisbsena angustifrons. 



Ampliisbajna angustifrons, Co2)e, Proc. Ac. Fhilad. 1861, p. 70, and 

 Proc. Am. Philus. Svc. 1885, xxii. p. 188, pi. — . tig. 4. 



Differs from A. darwinii in the presence of an infraocular, sepa- 

 rating the ocular from the third and fourth labials, which are 

 minute. 



Buenos Ayres. 



\_Ami^hishct;na occidentalism Cope, Journ. Ac. Philad. (2), viii, 1876, 

 p. 170, and Proc. Am. Philos. 8oc. xxii. pi. — . fig. 3, from the 

 Valley of Jequetepec, Peru, is another close ally of A. vermindaris 

 and darwinii, but is not sufiiciently characterized in the description 

 to be incorporated in the system.] 



12. AmpMsbaBna plumbea. (Plate XXIII. fig. 2.) 

 Amphisbsena plumbea, O'ra)/, Cut. S/t. licpt. ii. p. 36. 

 Allied to A. darwinii, but well distinguished in the following 



