NEOPAREAS.—LOXOCEMUS. 179 
which the fourth, fifth, sixth, and seventh, or the third, fourth, fifth, and sixth enter 
the orbit; temporals 142+3+43. The median lower labialis much broader than long ; 
the lower labials of the first pair coalesce, forming one shield, which stretches from 
one side to the other behind the median labial. There are three undivided gular 
shields along the middle; the first is nearly round, the second sub-semicircular, 
the third of nearly the same shape as, but narrower than, the first ventral. Ventrals 
195; subcaudals 129. 
Ground-colour deep black, with white rings completely encircling the body—the first 
round the neck, fourteen round the trunk, and twelve round the tail; the white rings 
are only half as broad as the interspaces of the black ground-colour. 
I know this extraordinary species from one specimen only, 214 inches long, of which 
the tail takes 8. 
Fam. NOTHOPSIDA. 
NOTHOPSIS. 
Nothopsis, Cope, Proc. Ac. N. Sc. Phil. 1871, p. 201. 
1. Nothopsis rugosus. 
Nothopsis rugosus, Cope, Proc. Ac. N. Sc. Phil. 1871, p. 201, t. 17. figg. 1-7. 
Hab. Panama, Isthmus of Darien. 
Fam, BOIDA. 
LOXOCEMUS. 
Lowxocemus, Cope, Proc. Ac. N. Sc. Phil. 1861, pp. 76, 304; Ginth. Zool. Rec. 1864, p. 1238. 
Plastoseryx, Jan, Wiegm. Arch, 1862, p. 242. 
1. Loxocemus bicolor. | 
Loxocemus bicolor, Cope, Proc. Ac. N. Sc. Phil. 1861, p. 76; Giinth. Ann. & Mag. N. Hist. 
1862, ix. p. 55; Bocourt, Miss. Sc. Mex., Rept. p. 515, t. 30. figg. 5, 5a-c; Boul. Cat. 
Sn. i. p. 74. 
Plastoseryx bronni, Jan, Iconogr. Ophid. iu. t. 1. 
Loxocemus bronni, Bocourt, Miss. Sc. Mex., Rept. p. 516, t. 30. figg. 6, 6a, b. 
Loxocemus sumichrasti, Bocourt, Journ. Zool. v. 1876, p. 344; Sumichrast, Bull. Soc. Zool. Fr. 
1880, p. 180. 
Hab. Mexico, Colima (Xantus), Tehuantepec (Swmichrast) ; GuavTEMALA (Dow). 
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