62 BULLETIN 18 7, UNITED STATES NATIONAL MUSEUM 



Genus EXELENCOPHIS Smitji 



Exelencophis Smith, Zoologica, vol. 27, 1942, p. 33. 



Gervotype. — Tantilla nelsoni Slevin. 



Range. — Maria Madre Island, Tres Marias Islands. 



Species. — One. 



EXELENCOPHIS NELSONI (Slevin) 



Tantilla nelsoni Slevin, Proc. California Acad. Sci., ser. 4, vol. 15, 1926, pp. 



200-201. 

 Exelencophis nelsoni Smith, Zoologica, vol. 27, 1942, p. 23. 



Type. — Lost ; originally Calif. Acad. Sci. No. 58680. 

 Type locality. — Maria Madre Island, Tres Marias Islands. 

 Range. — The type locality. 



Genus FICIMIA Gray 



Ficimia Gray, Catalogue of the snakes in the British Museum, 1849, p. 80. — 

 Smith and Taylor, Journ. Washington Acad. Sci., vol. 31, 1941, pp. 356-368, 

 figs. 3-5, 8-14, 17. 



Amhlymetopon Gijnther, Catalogue of the snakes in the British Museum, 1858, 

 P- 7 (type, A. variegatum Giinther). 



Genotype. — Ficimia olivacea Gray. 



Range. — Extreme southern Texas and Guerrero southward on both 

 coasts to Guatemala on the Pacific and Honduras on the Atlantic. 

 /Species. — Five, all occurring in Mexico. 



KEY TO FORMS OF FICIMIA 



1. No dorsal markings vphatever ; usually tvpo postoculars ; interuasals usually 



absent olivacea olivacea 



Dorsal bands present ; one or two postoculars ; internasals present or 

 absent 2 



2. Dorsal bands very narrow (a scale length or less), separated from each 



other by about three times their own length ; one postocular ; no 



internasals olivacea streckeri 



Dorsal bands longer (one and one-half or more scale lengths), separated 

 from each other by no more than one and one-half times their own 

 length ; two postoculars usually ; internasals present or absent « — 3 



3. Bands on body 21 to 35 ; internasals usually present publia 



Bands on body 43 or more ; interuasals present or absent 4 



4. Internasals present ruspator 



Internasals absent variegata 



FICIMIA OLIVACEA OLIVACEA Gray 



Ficimia olivacea Gray, Catalogue of the snakes in the British Museum, 1849, p. 

 80.— GtJNTHEB, Biologia Centrali-Americana, Kept., 1898, p. 98 (part), pi. 35, 

 fig. B (not fig. C).— Smith and Taylok, Journ. Washington Acad. Sci., vol. 

 31, 1941, pp. 366-367, figs. 4, 9, 13 (head scales and head pattern). 



Type. — Brit. Mus. Nat. Hist. 

 Type locality. — Mexico. 



