ADELPHICUS.—PSEUDOFICIMIA. 95 
mously enlarged chin-shields, as are also the second and third pairs. Scales smooth, 
in fifteen rows. Ventrals 135-142; anal divided. Upper parts light brownish, with 
a dark band on each side of the back along the fifth outer series of scales, generally 
another line along the second outer series, and sometimes one along the median series. 
Lower parts yellowish, with a brown line along the middle of the tail, this line being 
sometimes continued along the middle of the abdomen. 
This species is closely allied to Rhabdosoma lineatum from British Guiana, from 
which it differs, however, in the shape of the chin-shields, and by its divided anal; 
the southern species has also, as a rule, eight upper labial shields. It is singular that 
Fischer denies the presence of longitudinal bands in the specimens examined by him. 
I have received from the Stuttgart Museum one of the types of Rhegnops sargiv, and in 
it five longitudinal bands are distinctly visible. 
TOLUCA. 
Toluca, Kennicott, U. 8. & Mex. Bound. Surveys, Rept. p. 23 (1859). 
Achirhina, Jan, Arch. per la Zool. i. p. 61 (1862). 
Body stout; head short and broad, wedge-shaped, almost continuous with the body ; 
tail short; eye of moderate size. Snout pointed, the rostral turned back upon the 
upper side. ‘I'wo pairs of frontals, of which the posterior are separated by the produced 
anterior angle of the vertical. Nasal single, elongate, touching the ante-orbital; no 
loreal. Scales smooth, in seventeen rows. None of the teeth are grooved. 
1. Toluca lineata. 
Toluca lineata, Kennicott, U.S. & Mex. Bound. Surveys, Rept. p. 23, t. 21. fig. 2; and Pac. R. R. 
Exp., Rept. t. 35. fig. 8. 
Achirhina defilippit, Jan, Arch. per la Zool. ii. p. 61. 
Hab. Mexico, Valley of Mexico, Puebla, Toluca (Smiths. Inst.). 
One ante- and two postoculars; seven upper labials. Upper parts light brownish 
grey, with three imperfect blackish longitudinal bands, each occupying a single series 
of scales. 
I have not seen specimens of this snake. 
PSEUDOFICIMIA. 
Pseudoficimia, Bocourt, Miss. Sc. Mex., Rept. p. 572 (1883). 
Habit of the body coronelloid; head rather short and thick, not distinct from neck ; 
eye of moderate size. Snout pointed, with the rostral shield enlarged, but not dividing 
the anterior frontals; its anterior edge is rather sharp and turned upwards, the upper 
surface of the shield being concave. ‘Two pairs of frontals. Nostril between two 
nasals ; loreal replaced by posterior frontal, which is in contact with the second upper 
