3. lEPTOGNATHUS. 447 



Synojasis of the Species, 



I. Scales ia 13 rows, vertebrals enlarged. 



Eight (rarely nine) upper labials ; ven- 



trals 162-190 ; subcaudals 82-108 . 1. catesbyi, p. 449. 

 Ten or eleven upper labials ; ventrals 



186-220 ; subcaudals 112-145 .... 2. pavonina, p. 450. 



II. Scales in 15 rows. 



A, First two or three pairs of lower labials in contact behind the 



symphysial; ventrals 162-192; subcaudals 85-91. 



1. Vertebral scales moderately enlarged. 



Nine or ten upper labials 3. variegata, p. 451. 



Seven upper labials 4. albifrons, p. 451. 



2. Vertebral scales scarcely enlarged ; nine or ten upper 



labials 5. hrevifacies, p. 452. 



B. First lower labial in contact with its fellow behind the sym- 



physial. 



1. Vertebral scales very strongly enlarged, the largest nearly 



twice as broad as long ; ventrals 184^188 ; subcaudals 

 82-94. 



a. Eight upper labials. 



Rostral broader than deep; no prse- 



ocular 6. andiana, p. 452. 



Eostral nearly as deep as broad; one 



praeocular 7. elegans, p. 452. 



&. Seven upper labials 8. leucomelas, p. 453. 



2. Vertebral scales moderately enlarged, 



a. Ventrals 156-180 ; subcaudals 45-90. 



Subcaudals 53-90 ; three labials behind 



those entering the eye 9. mihani, p. 453. 



Subcaudals 45-52 ; two labials behind 



those entering the eye 10. ventrimaculata, p. 454. 



Subcaudals 61 ; five labials behind 



those entering the eye 11. incequifasciata, p. 455. 



b. Ventrals 164-197 ; subcaudals 110-114. 



Two pr^oculara 13. alternans, p. 456. 



No prseocular 14. viguieri, p. 457. 



