160 . OPHIDIA. 
Var. n. Whitish, back with three complete black dorsal lines, and with a narrow 
incomplete, undulated line on each side. | 
Hab. Mexico (Mus. Brit.). 
Var. 6. One complete black dorsal line, and a pair of narrow undulated lines on 
each side: freminvillit, var., D. & B. 
Hab. GuaveMAua, Peten (D. & B.), Plain of Zacapa (Salvin). 
Var. 1. Five complete black lines on the back and sides; ventrals 170: guenque- 
lineata, Hallow. . 
Hab. Mexico, Jalapa (Hoge); Honpuras (Hallowell). 
TACHYMENIS. 
Tachymenis, Wiegm. Act. Ac. Ces. Leop.-Carol. xvii. p. 251 (1834). 
Coronella, sp., Giinth. Cat. Col. Sn. p. 36 (1858). 
Coniophanes, Cope, Proc. Ac. N. Se. Phil. 1860, p. 248. 
Glaphyrophis, Jan, Prodr. in Arch. per la Zool. 1868, p. 94. 
Erythrolamprus, sp., Cope, Bull. U.S. Nat. Mus. no. 32, 1887, p. 77. 
Body cylindrical, coronelliform ; tail of proportionate length ; head of proportionate 
shape, distinct from neck. Rostral rounded, not prominent. Two pairs of frontals ; 
two nasals. Scales smooth. Grooved tooth of moderate size. 
1. Tachymenis piceivittis. 
Coniophanes piceivittis, Cope, Proc. Am. Phil. Soc. 1869 (July), p. 149; Bocourt, Miss. Se. Mex., 
Rept. p. 656, t. 41. figg. 2, 2a-e; Sumichrast, Bull. Soc. Zool. Fr. v. p. 181 (1880). 
Tachymenis piceivitiis, Giinth. Ann. & Mag. N. H. 1872, ix. p. 20. 
Tachymenis teniata, Peters, MB. Ak. Wiss. Berl. 1869 (December), p. 876. 
Hab. Mexico, Tehuantepec (Swmichrast), Yucatan (Mus. Brit.). 
Scales in twenty-five rows. Upper labials eight, the fourth and fifth entering the 
orbit. A small second preeocular below the large one. Upper parts and upper half of 
the sides black, with a narrow white band on each side of the back, commencing from 
the canthus rostralis and ending on the tail. Lower parts and lower half of the sides 
white. | 
The resemblance in coloration of this snake to the aglyphodont Dromicus. fulvivittis 
(antea p. 113) is so extraordinary that without examination of the teeth and number of 
scales the two forms would be readily mistaken for each other. It would be of interest 
to know whether the two live together in the same districts. At present we know 
the aglyphodont form only from Guerrero and Orizaba. 
