CHECKLIST OF THE SNAKES OF MEXICO 171 



17. Red rings not over twice length of black rings, usually nearly equal— 18 

 Red rings over twice as long as black rings browni* 



18. Light parietal ring one-third length of parietals; yellow rings covering 



no more than one scale length on any part of the body, 



usually less fitzingeri mlcrogalbineus 



Light parietal ring two-thirds length of pai'ietals ; yellow rings 

 covering about one-half to two scale lengths at least an- 

 teriorly fitzingeri fitzingeii 



19. Black nape ring covering six scale lengths behind head middorsally ; 



ventrals 218 in single male nuchalis taylori* 



Black nape ring covering two or three scale lengths behind head mid- 

 dorsally ; ventrals 192 to 213 in males 20 



20. Black rings on body 20 to 28 aflanis alienus 



Black rings on body fewer 21 



21. Temporals generally 1-2 ; generally at least a few caudals entire. 



afl&nis mayensia 

 Temporals usually 1-1 ; all caudals generally divided afiEinis affinis 



MICRURUS AFFINIS AFFINIS (Jan) 



Elaps affinis Jan, Rev. Mag. Zool., 1858, p. 525, pi. 2 (col.). 



Elaps fulvius afflnis Jan, Iconographie generale des ophidiens, livr. 42, 1872, pi. 1, 



fig. 2. 

 Micrurus afflnis affinis Schmidt, Publ. Field Mus. Nat. Hist., zool. ser., vol. 20, 



1933, p. 36.— Taylor, Univ. Kansas Sci. Bull., vol. 26, 1989 (1940), p. 485.— 



Smith, Proc. U. S. Nat. Mus., vol. 93, 1943, p. 452. 

 Elaps coralUnus crcbripiinctaius Pettehs, Mouatsb. Akad. Wiss. Berlin, 1869, p. 877 



(type locality, state of Puebla ; type in Berlin Mus.). 

 Elaps fiili'ius diastema Mooquard {nee Dumeril and Bibron), Mission scientifique 



au Mexique et dans I'Amerique centrale, Rept., livr. 16, 1908, pi. 74, fig. 5. 

 Elaps fulvius epistema Mooquard (nee Dumeril and Bibron), Hid., fig. 6. 



Type.— Mus. Hist. Nat. Paris No. 4624. 

 Type locality. — Mexico. 



Range. — Central and southern Veracruz, and parts of eastern Puebla 

 and Ouxaca (recorded from Oaxaca, Puebla, and Veracruz). 



MICRURUS AFFINIS ALIENUS (Werner) 



Elaps alienus Weknee, Zool. Anz., vol. 26, 1903, p. 249. 



Mia-urus affinis alienus Schmidt, Publ. Field Mus. Nat. Hist, zool. ser., vol. 20, 



1936, pp. 212-213. 

 Mierurus affinis stantoni Schmidt, Publ. Field Mus. Nat. Hist., zool. ser., vol. 20, 



1933, pp. 36-37 (type locality, Belize, British Honduras ; type. Field Mus. Nat. 



Hist. No. 4201). 



Type. — Mus. Nat. Belgique. 



Type locality. — Unknown; "perhaps Venezuela or Ecuador," in 

 error. 



Range. — Atlantic lowlands from the Isthmus of Tehuantepec to 

 British Honduras and Peten, including the base of the Yucatan Penin- 

 sula (known in Mexico from the states of Campeche, Oaxaca [El 

 Barrio or Barrios], and Tabasco). 



