28 BULLETIN 187, UNITED STATES NATIONAL MUSEUM 



Ra/nge. — Colima to the Isthmus of Tehuantepec (recorded from the 

 states of Colima, Guerrero, Michoacan, and Oaxaca) . 



Family COLUBRIDAE Cope 



Colubridae Cope, Proc. Amer. Philos. Soc, vol. 23, 1886, p. 479. 

 Type. — Coluber Limiaeus. 



Subfamily Sibynophiinae Dunn 



Sibynophiinae Dunn, Bull. Antivenin Inst. Amer., vol. 2, 1928, p. 20. — Tatlob and 

 Smith, Univ. Kansas Sci. Bull., vol. 29, 1943, p. 304. 



Type. — Sibynophis Fitzinger. 



Genua SCAPHIODONTOPHIS Taylor and Smith 



Scaphiodontophis Taylor and Smith, Univ. Kansas Sci. Bull., vol. 29, 1943, pp. 

 302-304. 



Genotype. — Enicognathus anrmlatus Dumeril and Bibron. 



Range. — Coastal and foothill regions from central Mexico (Atlantic 

 slopes) to Colombia. 



Species. — Nine species and subspecies are known; five occur in 

 Mexico. 



KEY TO MEXICAN SPECIES OF SCAPHIODONTOPHIS 



1. No bands on body or tail; body nearly uniformly colored, not red; 181 



ventrals sumichrasti 



Bands present at least on body ; triads separated by red ; ventrals 157 

 or less 2 



2. Black head cap followed by a red area (sometimes narrow), then a pair 



of black bands (enclosing a white) carpicinctus 



Black head cap followed in succession by a white band, a single black band, 

 and a longer red band 3 



3. Tail banded, as well as all of body cyclurus 



Tail not banded ; all or part of body banded 4 



4. All of body banded nothus 



Anterior third or half of body banded albonuchalis 



SCAPHIODONTOPHIS ALBONUCHAUS Taylor and Smith 



Scaphiodontophis albonuclialis Tatlob and Smith, Univ. Kansas Sci. Bull., vol. 

 29, 1943, pp. 323-327, fig. 9, pi. 23, fig. 1, pis. 24, 25, map fig. 4. 



Type.— U.S.1^.M. No. 110413. 



Type locality. — Finca La Esperanza, near Escuintla, Chiapas. 



Range. — Foothills on both coasts south of the Isthmus of Tehuante- 

 pec; on the Pacific side, from southern Chiapas (near Escuintla) to 

 El Salvador; on the Atlantic side, known only from Tabasco (San 

 Juan Bautista) , and central Veracruz (near Jalapa). 



