272 COLUBRID. 
b. Internasals fused with preefrontals. (A. variegatum, Gthr.) 
ourey. 160 ;'C, 37). Mexico. M. Sallé [C.]. 
d. 9 (V. 149; C. 36). Mexico. 
(Types of A. variegatum.) 
e. Hgr. 2 (V. 142; C. 35). Mexico. 
2. Ficimia cana. 
Gyalopion canum, Cope, Proc. Ac. Philad. 1860, p. 248; Yarrow, 
Wheeler's Rep. U.S. Explor. Surv. W. 100th Mer. v. p. 624, 
pl. xviii. fig. 2 (1875). 
Ficimia cana, Garm. N. Am. Rept. p. 83 (1883); Giinth. Biol. 
C-Am., Rept. p. 99 (1893). 
Closely allied to the preceding, but rostral pointed behind and 
wedged in between the prefrontals; internasals present, small ; 
seven upper labials, as in the preceding. Ventrals 130-131; sub- 
caudals 28. Pale yellowish or reddish brown above, with brown, 
dark-edged cross bars, which are broken up into spots on the sides ; 
a large triangular dark spot on the nape, with the point between the 
parietals; a dark band across the head, to the lower labials, passing 
through the eyes across the interocular region; lower parts uniform 
white. 
Total length 205 millim. ; tail 28. 
Arizona and Western Texas. 
a. 2 (V.181; C. 28). El Paso, Texas. Hy. A. Forrer [C.]. 
3. Ficimia quadrangularis. 
Ficimia quadrangularis, a Biol. C.-Am., Rept. p. 99, pl. xxxv. 
fie, A (1893). 
Scaling as in F. cana, but seventh upper labial very small, scale- 
like. Ventrals 129; subcaudals 23. Ground-colour nearly white, 
each scale with a narrow brown margin; a series of large sub- 
quadrangular blackish-brown spots along the back ; no spots on the 
sides ; a large blackish band on the nape, confluent with a large 
blackish blotch covering the frontal and supraocular shields and 
the greater part of the parietals ; lower parts white. 
Total length 320 millim.; tail 37. 
Western Mexico. 
a. 9 (V. 129; C. 23). Presidio, near Mazatlan. Hr. A. Forrer [C.]. 
(Type.) 
101. CHILOMENISCUS. 
Chilomeniscus, Cope, Proc. Ac, Philad. 1860, p. 359, and 1861, p. 302, 
and Proc. U.S. Nat. Mus. xiv. 1892, p. 593, 
Maxillary teeth equal or the posterior a little stouter. Head not 
distinct from neck; snout rounded, very prominent, and much 
depressed ; eye emall, with round pupil ; rostral large; no loreal ; 
