OXYRRHOPUS. 167 
1. Oxyrrhopus plumbeus. 
Coluber plumbeus, Wied, Reise Brasil. i. p. 95, and Abbild. xiii. t.6; Schleg. Ess. ii. p. 152, 
t. 6. figg. 3, 4. 
Brachyruton plumbeum, Dum. & Bibr. Erpét. vii. p. 1004; Jan, Iconogr. Ophid. xxxv. t. 1. fig. 3. 
Oxyrhopus plumbeus, Giinth. Cat. Col. Sn. p. 189; Cope, Journ. Ac. N. Se. Phil. viii. p. 131 (1875), 
and Bull. U. S. Nat. Mus. no. 32, p. 76. 
Hab. Mextco, Tehuantepec (Cope); GuaTeMaLa (Mus. Brit.); Costa Rica (Gabb).— 
Tropica, Sourm AMERICA. 
2. Oxyrrhopus cloelia. 
Coluber cloelia, Daud. Rept. vi. p. 330, t. 78. 
Brachyruton cloelia, Dum. & Bibr. Erpét. vii. p. 1007; Jan, Tconogr. Ophid. xxxv. t. 1. fig. 1. 
Oxyrhopus cloelia, Giinth. Cat. Col. Sn. p. 189; Cope, Proc. Am. Phil. Soc. xvii. p. 92 (1878) ; Bull. 
U.S. Nat. Mus. no. 32, p. 76 (1887) ; Sumichrast, Bull. Soc. Zool. Fr. v. p. 184 (1880). 
Scolecophis scytalinus, Cope, Proc. Ac. N. Sc. Phil.’ 1866, p. 320. 
Hab. Mexico, Tehuantepec (Sumichrast), Yucatan (Schott); Panama, Veraguas and 
Isthmus of Darien (Cope).—Tropicat South AMERICA. 
3. Oxyrrhopus occipitoluteus. 
Brachyruion occipitoluteum, Dum. & Bibr. Erpét. vii. p. 1009; Jan, Iconogr. Ophid. xxxv. t. 1. fig. 2 
Oxyrhopus occipitoluteus, Cope, Bull. U.S. Nat. Mus. no. 82, p. 76 (1887). 
Hab. Panama, Darien (Cope). 
Not seen by me. 
4. Oxyrrhopus petolarius. 
Coluber petolarius, Linn. Mus. Ad. Fred. t. 9. fig. 2. 
Oxyrhopus petolarius, Wagl. Syst. Amph. p. 185; Giinth. Cat. Col. Sn. p. 190; Dum. & Bibr. 
Erpét. vii. p. 1033; Cope, Journ. Ac. N. Se. Phil. viii. p- 182.. 
Lycodon petolarius, Schleg. Ess. ii. p. 122. 
Oxyrhopus subpunctatus, Dum. & Bibr. Erpét. vii. p. 1016. 
Oxyrhopus rhombifer, Dum. & Bibr. Erpét. vii. p- 1018; Jan, Iconogr. Ophid.. Xxxv. t. 5. fig. 2. 
Oxyrhopus multifasciatus, Dum. & Bibr. Erpét. vii. p. 1019; Jan, Iconogr, Ophid. Xxxv. t. 6. fig. 2 
Oxyrhopus bipreocularis, Dum. & Bibr. Erpét. vii. p. 1030. 
Hab. GuareMaua, Vera Paz, low forest (Salvin); Nicaragua, Chontales Mines (Crow- 
foot), ), Matagalpa, alt. 3250 feet (Rothschuh); Costa Rica (Salvin), Sipurio (Cope). 
—TropicaL South AMERICA. 
One of the characters by which Duméril and Bibron distinguish their 0. petolarius 
is the extent of the preocular, which is said to be in contact with the vertical. This 
is really the case in the majority of specimens, but it is a by no means constant 
character ; not only in South-American, but also in the few Central-American specimens 
