312 Alexander G. Euthven, 



vaceous (197, 207 and paler), but has a bronze appearance. It is 

 confined to triangulär areas by brown (153, 109, 138) cross bands 

 that have narrower dark reddish brown or black margins. The 

 margins are indistinct on the sides where the bands tliemselves 

 expand and become obscure but they become more distinct dorsally 

 and are connected on the vertebral line by a distinct short, blackish 

 line. There are seven cross bands, counting the one behind the hind 

 legs and the one on the occiput. The latter differs from the others 

 in being narrower and dividing near the median line, one branch 

 going forward to the eye and downward to the angle of the mouth 

 and the other backward and downward to tlie ear. The posterior 

 branch may be obscure. The ground color of the head may be the 

 same as that of the body, or the muzzle and the entire upper i)art 

 may be pale brownish (162 or slightly paler). There is an angular 

 cross band between the eyes that in two specimens is a darker 

 brown (133) than the ground color, but in the third specimen it is 

 but little darker than the latter, being chiefly distinguished by the 

 darker border (110). The legs are crossed by regulär but ratlier 

 indistinct bars. The belly is pale (153c, 0146) and immaculate, except 

 in the female which has the chin and throat marbled with dusky. 

 In the males the pouch is bright red (66, 81), the scales showing 

 as white spots. The rudiment of a pouch in the female is colored 

 as the belly except that the margin is tinged with yellow. 



This species was found by F. H. Rüthven in the dense w^oods along 

 La Laja Creek, and it w^as observed nowhere eise. The specimens 

 obtained w^ere near the ground on free trunks, and were very difficult 

 to see for the coloration formed a verj etfective case of background 

 picturing. This was accomplished not only by the pattern, but also 

 by color changing, the ground color of each individual agreeing with 

 the color of the bark on which it was found. One specimen taken 

 on a very dark-colored tree trunk was nearly uniformly black above, 

 but this color changed to that described above when the animal 

 was removed. 



M e a s u r e m e n t s. 



