2^2 COLUBEID^. 



b. Internasals fused with prsefrontals. (A. variegatum, Gthr.) 



c. Yg. (V. 160 ; C. 37). Mexico. M. Salle [C.]. ( 



d. $ (V. 149 ; C. 36). Mexico. I 



(Types oi A. variegatum.) 



e. Hgr. 2 (V. 142; C. 35). Mexico. 



2. Ficimia cana. 



Gyalopion camim, Cojie, Proc. Ac. Philad. 1860, p. 243; Yarrow, 

 Wlieeler's Rep. U.S. Explor. Surv. W. lOOfh Mer. v. p. 624, 

 pi. xviii. fig. 2 (1875). 



Ficimia cana. Garni. N. Am. Rept. p. 83 (1883) ; Gunth. Biol. 

 C.-Am., Rept. p. 99 (1893). 



Closely allied to the preceding, but rostral pointed behind and 

 wedged in between the prsefrontals ; 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 iuterocular region ; lower parts uniform 

 white. 



Total length 205 millim. ; tail 28. 



Arizona and Western Texas. 



«. $ (V. 131 ; C. 28). El Paso, Texas. Hr. A. Forrer [C.]. 



3. Ficimia quadrangularis. 



Ficimia quadrangularis, Gunth. Biol. C.-Am., Rept. p. 99, pi. xxxv. 

 fig. 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 : 0, 23). Presidio, near Mazatlan. Hr. A. Forrer FC.]. 



(Type.) 



101. CHILOMENISCUS. 



Chilomeniscus, Cope, Proc. Ac. Philad. 1860, p. 339, 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 small, with round pupU ; rostral large ; no loreal ; 



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