70 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



There is some vaiiatiou in tlie specimens, of the precise outline of 

 the curve of palatine teeth. Sometimes this is less angular anteriorly 

 and does not reach beyond the posterior border of the inner nares. 



In life tlris species is of ? dark, livid blackish- brown above, oliva- 

 ceous on the sides, and from light olive to dirty white beneath. On the 

 upper surface, generally on the side of the tail and limbs, are nearly 

 circular yellow spots about the size of the eye, and generally sharply 

 defined. These are much like those of A. punctatum, though not quite 

 so distinct, and although a faint indication of arrangement in ten dorsal 

 rows may be traced, yet these are less synimetrically disposed, and sin- 

 gle ones are scattered between the others along the back. Similar scat- 

 tered spots are seen along the belly, which again is bordered, as on the 

 lower part of the sides, with larger, more quadrate spots, which are 

 more or less confluent, giving rise to elongated blotches, overpowering 

 the ground color. This is also sometimes the case on the belly and 

 almost always on the chin or beneath the head and neck. 



The rounded spots above sometimes vary, considerably in size, and 

 occasionally are almost wanting. Sometimes they are more or less con- 

 fluent, in which case there is usually a predominance of yellow on the 

 belly. In a large series of specimens I have not observed any vertical 

 yellow bands on the side of the tail. 



In the young, just perfected from the larva, the upper parts are dark 

 brown; the under parts of a uniform brownish-yellow. The yellow 

 spots next make their appearance, becoming more and more prominent 

 to a certain age. In very old specimens the dorsal spots become in- 

 distinct, but may generally be discovered when held under water or 

 alcohol. 



Dimensions of 4691. 



Inchea. 



From snout along axial line to end of mouth 



From snout to gular fold 1-00 



From snout to groin 3. 50 



From snout to end of anus 4.40 



From snou t to end of tail 8. 00 



Width of head SO 



Fore- arm from elbow 80 



Hiud leg from knee ■ L 10 



The longest specimen before me measures 10 inches (4003 Eacine). In 

 this the tail from behind anus is as long as the rest of the animal. De 

 Kay describes one of 11 inches in length. 



Measurements of a typical specimen of the var. tigr>^>.um (4692). 



Inches. 



Length from snout to eud of mouth along median line 45 



Length from snout to gular fold 90 



Length from snout to groin 3. 10 



Length from snout to behind anus 3. 75 



Length from snout to tip of tail „ 7. 55 



Length of tail- .- 3.80 



