157. TACHYMENIS, 117 
B. Scales moderately keeled. 
a, b-c.  (V.151; C.73) Rio Janeiro, Mrs. Fry [P.]. 
& 2 (V. 150, 143; 
C. 67, 59). . 
d-e. 3 (V.145; C.65) Asuncion, Paraguay. Dr. J. Bohls [C.]. 
& her. (V. 189; C. 55). 
' Q. Scales faintly keeled: 
a-c. Hgr. (V. 152,138, Demerara. Dr. Hancock [P.]. 
* 141; C. 70, 60, 60). 
d,e. § (V. 155; C. 78) Rio Janeiro, A. Fry, Esq. [P.]. 
& 2 (V. 148; C. 69). 
J 2 (V. 154; C.69). Brazil. Dr. Gardner [P.]. 
D. Scales smooth. 
a. Q (V. 144; 0.48).  Aracati, N. Brazil. D. G. Rutherford, Esq. 
r [P.}. 
b,c-d. 3 (V. 139,142; Rio Grande do Sul. Dr. a v. Ihering [C.]. 
C. ?, 63) & her. 
e. 2 (V. 183; 0.56). ——? (Type of Tomodon strigatus.) 
2. Thamnodynastes punctatissimus. 
neetr Boot one Wagl. in Spix, Serp. Bras, p. 89, pl. xiv. fig. 1 
24), 
Dipsas punctatissima, Schleg. Phys. Serp. ii. p. 292, pl. xi. figs, 33 & 34 
' (1837); Dum. § Bibr. vii. p. 1151 (1854). 
Sibon punctatissimus, Berthold, Abh. Ges. Wiss. Gétting. i. 1843, 
p. 68, pl. i. figs. 18 & 14. 
Thamnodynastes punctatissimus, Giinth. Cat. p. 164 (1858); Jan, 
Icon. G'én. 39, pl. ii. fig. 2 (1872). 
Very closely allied to the preceding, but body more slender, eye 
larger, rostral but little broader than deep, scales smooth, in 17 rows, 
and anal entire. Ventrals 137-159; subcaudals 80-96. 
Total length 550 millim.; tail 150. 
Guianas, Brazil. 
a. & (V. 159; C. 88). Demerara. Mr. W. T. Turner [C.], 
b. 3 (V. 144; C. ?). Upper Amazon. Mr. E. Bartlett [C.]. 
e. 2 (V. 146; C. 80). . ——P 
157. TACHYMENIS. 
Tachymenis, Wiegm. N. Act. Ac. Leop.-Carol. xvii. i. 1835, p. 251. 
Coronella, part., Schleg. Phys. Serp. ii. p. 50 (1837). 
Dipsas, part., Dum. § Bibr. Erp. Gén. vii. p. 1133 (1854). 
Tachymenis, part., Giiinth. Cat. Col. Sn. p. 33 (1858). 
Mesotes, part., Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 806. 
Psksioph ying, part., Jan, 1. c. p. 309. 
Maxillary teeth subequal, 10 to 15, followed, after an interspace, 
by a pair of large grooved fangs situated below the posterior border 
of the eye; anterior mandibular teeth longest, Head scarcely 
