Occasional Papers of the Museum of Zoology 15 



closely related to both M. tschudii (Jan.) and M. dissoleiicus 

 Cope. It may well be called 



Micrurus dunni, sp. no v. 



Type: M. C. Z. 16,304, from the vicinity of Ancon, Canal 

 Zone of Panama. 



Head only moderately depressed; diameter of eye equal 

 to about two-thirds of its distance from mouth; rostral much 

 broader than high, little visible from above ; frontal very small, 

 about equal to a supraocular in breadth, not twice as long as 

 broad, and much less than its. distance from the tip of the 

 snout; one prae- and two postoculars; anterior temporal pres- 

 ent and \&ry narrow; seven upper labials, third and fourth 

 entering eye and nearly equal in size, the seventh well devel- 

 oped ; first lower labials in contact behind the symphysial ; 

 parietals very large, longer than their distance from the inter- 

 nasals; scales in 15 rows; anal divided; ventrals, 224; sub- 

 caudals, 19. 



Color: Head black, with a narrow white band crossing 

 the anterior portion of the parietals and sending forward 

 extensions to the posterior border of each eye, to cover two- 

 thirds of the frontal and the fifth and half of the sixth labial ; 

 this white ring is followed by a wide black band, then a nar- 

 rower red band, and then eleven triads, on the body, in each 

 case the central black ring being the widest, the other two 

 black bands being equal in width to the red interspaces sepa- 

 rating the triads and the same outer black rings of each triad 

 about twice as wide as the red rings within the triad ; these 

 red rings also have many scales tipped with black; tail with a 

 single normal triad and a black tip. 



Total length, 130 mm.; tail, 20 mm.; diameter of body, 

 4.5 mm. 



