890 14. ELAPIDZ 
Densurcu & Stevin, Proc. Cal. Acad. Sci., Ser. 4, Vol. 3, 1913, 
p. 425; Van Densurcu & Srevin, Proc. Cal. Acad. Sci., Ser. 4, 
Vol. 4, 1914, p. 147; Voruies, Univ. Ariz., Agric. Exper. Station 
Bull. No. 83, 1917, p. 364. 
Micrurus euryxanthus StEJNEGER & Barspour, Check List N. Amer. 
Amph. Rept., 1917, p. 106. 
Description—Head small, with flat top and high, 
broadly rounded snout. Temporal regions not much wider 
than neck. Eye very small. Rostral plate large, nearly as 
high as broad, bounded behind by internasal, anterior nasal, 
and first labial plates. Plates on top of head are a pair of 
internasals, a pair of prefrontals, a rather small frontal, 
supraocular of each side, and a pair of parietals. Anterior 
and posterior nasals distinct. No loreal. One preocular. 
Two postoculars. Temporals one followed by two. Supra- 
labials seven, third and fourth reaching eye, seventh small. 
Infralabials seven, or six, the fourth usually largest, the 
first pair meeting on midline. Genials in two pairs, very 
short. Scales on body smooth, in fifteen rows. Anal plate 
divided. Gastrosteges varying in number from 215 to 241. 
Urosteges in two series of from 21 to 29. 
The entire head is black, with the exception of the post- 
erior extremities of the parietals which are involved in a 
narrow white or yellow ring around the neck. Behind this 
white ring is a broad red ring involving about 11 scales, 
more or less. This is followed by another narrow white or 
yellow ring, some three or four scales wide, and then a 
black ring about eight scales in width. The whole body and 
tail are covered with similar broad red and black rings 
separated by narrow white or yellow ones. These rings of 
color encircle the body, and are without spots either above 
or below. The number of black rings on the body and tail 
varies from nine to 14. 
