22. cHEBsoDEOMtrs. 295 



e,f. $ (V. 144; C. 44) Honduras. 



& hgr. (V. 131, 0. 58). 

 9-i. S (V. 134 ; 0. 56) British Honduras. F. D. Godman & 0. 



& ? (V. 147, 139 ; Salvin, Esqrs. [P.]. 



0.44,47). > ^ L J 



^■. c?(V. 137; C. 56). British Honduras. Colonial Exhibition. 



I. 6 (V. 141 ; C. 67). Belize. 



•»j-p. c? (V. 139, 132 ; Teapa, Tabasco. Mr.H. H. Smith [C.]. 



C. 56, 54) & $ (V. F. D. Godman & 0. 



135, 139 ; C. .P, 50). Salvin, Esqrs. [P.\ 



y-«. c? (V.143; C.49), Jalapa, Mexico. Mr. Hoege ro.l 



?(V.134; C.4S),& ^ ' ^ 



yg. (V. 136; C. 50). 

 t-v. S (V. 141; 0.?), Mexico. Mr.HugoFinck[C.]. 



$ (V.141; 0.48),& '- 



yg. (V. 140 ; 0. 45). 

 ^v~y. $ (V. 142, 132 ; Mexico. M. SallS [0.1. 



0. 50, 44) & yg. (V. 



137; 0.59). ^ 

 z. S (V. 145; 0.46). Mexico. 



22. CHERSODROMUS. 



Chersodromus, JReinh. Vid. Meddel. 1860, p. 242 ; Jan, Arch. Zool. 



Anat. Phys. ii. 1862, p. 25 ; JSocowt, Miss. Sc. Mex., Rept. p. 552 



(1883). 

 Opisthiodon, Peters, Mon. Berl. Ac. 1861, p. 460. 



Maxillary bone very short, not extending forwards beyond the 

 palatines, with about 10 small, equal teeth ; niandibular teeth equal. 

 Head small, slightly distinct from neck ; eye very small, with 

 vertically subelliptical pupil ; posterior nasal concave ; a single prse- 

 frontal ; no prseocular, loreal and praefrontal entering the eye. 

 Body moderate, cylindrical; scales striated and keeled, without 

 pits, in 17 rows ; ventrals rounded. Tail moderate ; subcaudals 

 in two rows. Hypapophyses developed throughout the vertebral 

 column. 



Mexico and Guatemala. 



1. Chersodromus liebmanni. 



Ohersodromus liebmanni, Reinh. Vid. Meddel. 1860, p. 243 ; Peters, 

 Mon. Berl. Ac. 1861, p. 617 ; Jan, Arch. Zool. Anat. Phys. ii. 

 1862, p. 25, and Icon. Oen. 12, pi. iii. fig. 2 (1865) ; Boeourt, Miss. 

 Sc. Mex., Rept. p. 652, pi. xxxiv. fig. 8 (1883). 



nigricans, Reznh. I. c. p. 245. 



Opisthiodon torquatus, Peters, Mon. Berl. Ac. 1861, p. 461. 



Eostral once and a half as broad as deep, just visible from above; 

 internasals small ; frontal broader than long, scarcely longer than 

 the prefrontal, much shorter than the parietals ; loreal a little 

 longer than deep ; two postoculars, upper usually fused with the 

 supraocular, which is ' very small ; temporals 1 + 2 ; seven upper 

 labials, third and fourth entering the eye ; five lower labials in 



