3. AMPHISBENA, 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 preanal pores, but they 
are frequently hardly visible. Colour either uniform brown above 
and yellowish beneath, or checked with dark brown on yellowish 
ground, in which case a light collar may be apparent. 
millim. 
Length to vent .............. 360 
Tail (injured). ..... 0... ce eee 23 
Diameter of body ............ 16 
South Brazil, Paraguay, Uruguay, Buenos Ayres. 
a-d,e. Ad. & yg. (A.184- Rio Grande do Sul. Dr. v. Ihering (C.]. 
200+ 11-25). 
f-l. Ad. & hgr. (A. 182- 5S. Lorenzo, Rio Dr. v. Ihering (C.]. 
188+ 9-27). Grande do Sul. 
m, Ad. (A. 190423). Montevideo. Zoolog. Soc. 
n-g. Ad. (A. 183-190-+ Uruguay. 
9-25). 
r. Ad. skeleton. Uruguay. 
s, Ad, (A. 200+19). Buenos Ayres. E. W. White, Esq. [C.]. 
10. Amphisbena albocingulata. 
Amphisbeena albocingulata, Boettg. Zeitschr. f. Naturw. lviii. 1885, 
p. 215. 
Distinguished from A. darwinii by the presence of four pre- 
frontals, a smaller anterior and a larger posterior pair, and by the 
presence of a more or less distinct preocular. Annuli 190+27. 
Paraguay. 
11. Amphisbena angustifrons. 
Amphisbena angustifrons, Cope, Proc, Ac. Philad. 1861, p. 70, and 
Proc, Am. Philos, Soc. 1885, xxii. p. 188, pl. —. fig. 4. 
Differs from A. darwinit in the presence of an infraocular, sepa- 
rating the ocular from the third and fourth labials, which are 
minute. 
Buenos Ayres. 
[Amphisbena occidentalis, Cope, Journ. Ac. Philad. (2), viii, 1876, 
p- 176, and Proc. Am. Philos. Soc. xxii. pl. —. fig. 3, from the 
Valley of Jequetepec, Peru, is another close ally of A. vermicularis 
and darwinii, but is not sufficiently characterized in the description 
to be incorporated in the system. ] 
12. Amphisbena plumbea. (Pxrare XXIII. fig. 2.) 
Amphisbena plumbea, Gray, Cut. Sh. Rept. ii. p. 36. 
Allied to A. darwinit, but well distinguished in the following 
