212 COLTTBElr^. 



prsefrontals ; frontal longer than broad, longer than its distance 

 from the end of the snout, shorter than the parietals ; nasal entire ; 

 loreal a little longer than deep ; one prse- and two postooulars ^ 

 temporals 1+2; seven upper labials, third and fourth entering the 

 eye ; four lower labials in contact with the anterior chin-shields, 

 which are longer than the posterior. Scales in 15 rows. . VentralS' 

 152-170 ; anal divided ; subcaudals 37-45. Eed above, with pairs- 

 of black cross-bars enclosing yellow ones ; a large black spot on the 

 head, behind the snout ; lower parts whitish. 



Total length 285 miUim. ; tail 55. 



Mexico. 



a-b. cJ (V. 166 ; 0. 45) Mezquital del Ore. Dr. A. 0. Buller [0.].. 

 & 2 (V. 170; 0.42). 



3. ScolecopMs aemulus. 

 Procinura ssmula. Cope, Proc. Amer. Philos. Soc. xviii. 1879, p. 262.. 



Eostral visible from above ; frontal broad, acutely pointed 

 behind ; parietals short ; nostril between two nasals ; loreal quad- 

 rangular ; one prse- and two postooulars; temporals 1+2; seven 

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

 shields much longer than the posterior. Scales in 15 rows, keeled 

 on the posterior dorsal region ; caudal scales keeled, tubercular. 

 Ventrals 148 ; anal divided ; subcaudals 41. Body encircled with 

 black annuli, which are broadly bordered with yeUow and separated 

 by red interspaces of twice their width ; the red scales with a central 

 black spot ; a large black spot covering the frontal, parietal, and 

 supraocular shields. 



Total length 364 millim. ; tail 61. 



Southern Chihuahua, Mexico. 



/ 



184. HOMALOCRANIUM, 



Duberria, part., Fitzing. N. Class. Eept. p. 29 (1826). 

 Cloelia, part., Wagl. Syst. Amph. p. 187 (1830). 

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

 Homalooranium, part., Dum. ^ Bibr. M^m. Ac. Sc. xxiii. 1853, 



p. 490, and Erp. Ghi. vii. p. 855 (1854) ; Qunth. Cat. Col. Sn.. 



p. 18 (1858). 

 TantiUa, Paird 8f Oir. Cat. N. Am. Pfpt. p. 131 (1853) ; Cope, Proc. 



U.S. Nat. Mus. xiv. 1892, p. 597. 

 Lioninia, Sallow. Proc. Ac. Philad. 1860, p. 484. 

 Homalocranium, Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 50; 



Bocmrt, Miss. Sc. Mex., JRept. p. 778 (1883). 

 Microdromus, Giinth. Ann. 8r Mag. N. H. (4) ix. 1872, p. 17. 

 Pogonaapis, Cope, Proc. Ac. Philad. 1894, p. 204. 

 j^ 



MaxiUary teeth small, equal, 12 to 14, followed by a pair of 

 feebly-enlarged grooved teeth, situated below the posterior border 

 of the eye; mandibular teeth equal. Head small, not or but 

 slightly istinot from neck; eye small, with round pupil; no loreal 



