CHECKLIST OF THE SNAKES OF MEXICO 61 



Type locality. — Belize (= British Honduras). 

 Range. — The Yucatan Peninsula south to Costa Rica (recorded 

 from several localities in Yucatan^ and Chilon, Chiapas^ in Mexico). 



Genus ENULIUS Cope 



Enulius Cope, Proc. Amer. Philos. See, vol. 11, 1871, p. 559. — Dunn, Proc. Acad. 

 Nat. Sci. Philadelphia, vol. 89, 1938, pp. 415-418 (review of genus). 



Genotype. — Enulius murinus Cope [= Enulius -flavitorques 

 (Cope)]. 



Range. — Central-western Mexico (Michoacan) south to Colombia. 



Species. — Four forms are recognizable, two occurring in Mexico. 

 One of them {unicolor) may be a race of flavitorques (Guatemala to 

 Colombia), but the other two (slateri, sumichrasti) are very distinct. 

 E. -flavitorques may well occur in southern Chiapas. 



KEY TO MEXICAN SPECIES OF ENULIUS 



1. Length of portion of rostral visible from above nearly or quite equal to 

 its distance from frontal ; in lateral view, upper edge of snout nearly 



straight sumichrasti 



Length of portion of rostral visible from above two-thirds or less its 

 distance from frontal ; in lateral view, upper edge of snout distinctly 

 down-curved unicolor 



ENULIUS SUMICHRASTI Bocourt 



Enulius sumichrasti Bocourt, Mission scientifique au Mexique et dans I'Am^rique 

 centrale, Rept., livr. 9, 1883, p. 538, pi. 31, fig. 6.— Taylor and Smith, Univ. 

 Kansas Sci. Bull., vol. 25, 1938 (1939), pp. 247-249. 



Type.— Mus. Hist. Nat. Paris. 



Type locality. — Isthmus of Tehuantepec. 



Range. — Pacific slopes of Mexico east of the Isthmus of Tehuantepec 

 (known only from the vicinity of Escuintla and Tonala, Chiapas^ and 

 possibly Cacoprieto, Oaxaca) . 



ENULIUS UNICOLOR (Fischer) 



Oeophis unicolor Fischer, Abh. Nat. Ver. Bremen, vol. 7, 1882, pp. 227-228, pi. 15, 



figs. 1-3. 

 Enulius unicolor Taylor and Smith, Univ. Kansas Sci. Bull., vol. 25, 1938 (1939), 



p. 247.— Taylor, ihid., vol. 26, 1939 (1940), p. 453.— Smith, Proc. U. S. Nat. 



Mus., vol. 93, 1943, p. 427. 

 Oeagras longicaudatus Cope, Amer. Nat., 1884, p. 162 (type locality, Tehuantepec; 



type in Mus. Hist. Nat. Paris) (a new name for Enulius 7nurinus Bocourt 



[nee Cope], Mission scientifique au Mexique et dans I'Amerique centrale, 



Kept., livr. 9, 1883, pp. 537-538, pi. 35, fig. 9). 



Type. — Bremen Mus. 



Type locality. — Mexico. 



Range. — Michoacan, Morelos, and central Guerrero south to the 

 Isthmus of Tehuantepec (recorded from a few localities in the states 

 of Chiapas, Guerrero, Michoacan, Morelos, and Oaxaca). 



584960 — 45 5 



