102. noMAi-OsoMA. 271^ 



nasal single, confluent with the internasal. Body cjlindrical, short ; 

 scales smooth, with apical pits, in 13 rows ; ventrals rounded, Tail 

 short ; subeaudals in two rows. 

 Lower California, Sonora, Arizona. 



1. CMlomeniscus stramineus. 



Chilomeniscus stramineus, Gope, Proc. Ac. PhUad. 1860, p. 339, and 



Proc. U.S. Nat. Mus. xiv. 1892, p. 594. 



cinctus, Cope, Proc. Ac. Philad. 1861, p. 303. 



Carphophis straminea, Garm. N. Am. Kept. p. 99 (1883). 



cincta, Garm. I. c. p. 100. 



Chilomeniscus stramineus fasciatus, ©one, Proc. U.S. Nat. Mus. xiv. 



1892, p. 595. 



Internasals separated by the rostral or forming a short suture ; 

 frontal a little longer than broad, nearly as long as the parietals ; 

 supraocular very small ; nasal not reaching the single praeocular ; 

 two postoculars ; temporals 1 + 1 ; seven upper labials, third and 

 fourth entering the eye ; anterior chin-shields in contact with the 

 symphysial, twice as long as the posterior. Scales in 13 rows, 

 Ventrals 108-117 ; anal divided ; subeaudals 21-26. Reddish 

 brown above, dotted with dark brown, or with black cross bars 

 which may form complete annuli. 



Total length 235 millim. ; tail 33. 



Lower California and Sonora. 



2. Chiloijieiiiscus ephippicus. 



Chilomeniscus ephippicus, Cope, Proc. Ac. Philad. 1875, p. 85 ; 

 Coues, Wheeler's Pep. JExplor. Surv. TV. 100th Mer. v. p. 625, 

 pi. xviii. fig. 3 (1875). 



Rostral entirely separating the internasals ; frontal a little longer 

 than broad, nearly as long as the parietals ; nasal in contact with 

 the praeocular ; two postoculars ; temporals 1 + 1 ; seven upper 

 labials, third and fourth entering the eye ; anterior chin-shields 

 separated from the symphysial, posterior very small. Scales in 

 13 rows. Ventrals 113 ; anal divided ; subeaudals 28. Reddish 

 or yellow above, with black cross bars which do not quite reach 

 the ventrals ; tail with nearly complete black rings ; snout red, 

 rest of head black ; belly white. 



Total length 140 millim. ; tail 20. 



Nevada and Arizona. 



102. HOMALOSOMA. 



Duberria, part., Fitzinff. N. Class. Sept. p. 29 (1826). 

 Homalosoma, Wagl. Syst. Amph. p. 190 (1830) ; Bum. Sf Bibr. Erp. 



GH. vii. p. 109 (1854) ; Giinth. Cat. Col. Sn. p. 19 (1858) ; Peters, 



Peise n. Mossamb. iii. p. 107 (1882). 

 Oalamaria, part., Schleg. Phys. Serp. ii. p. 25 (1837). 

 Homalosoma, part., Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 33. 



Maxillary short, with 10 to 12 teeth ; maxillary and mandibular 



VOL. II. '^ 



