THE BATKACHIA OF NORTH AMERICA. 65 



Proportional dimensions. 



Muzzle to gular fold: Times. 



lu distance from suout to groin 3. 2 



In distance to end of vent (nearly) 4.2 



Fore-arm and foot : 



In distance to groin 3, 6 



In distance to end of vent 4. 7 



Lower leg and foot: 



In distance to groin 3 



In distance to end of vent 4 



Width of head: 



In distance to groin 3. 6 



2 



4 

 3 



Fig. 11. Amblygtoma copeanum Hay, natural size; copied from Hay. 



The color is dark brown, almost black, above, brownish yellow below 

 Between the fore and hind legs the light color of the btlly mounts up 

 on the sides to a level with the upper surfaces ot the I mbs. The mid- 

 dle of the belly is of a duskier hue than its sides. Pectoral, inguinal, 

 and pubic regions slightly brighter yellow than the sides of the belly. 

 Head above like the back, below like the other lower parts. Just 

 behind the symphysis of the lower jaw are indications of a bright yel- 

 low spot. The upper half of the tail is not so dark as the back, the lower 

 half duskier than the belly. The limbs below and in front yellowish, as 

 other lower parts. Feet, especially above, dark. 



This species must be compared with A. hicolor and A. iigrinum. The 

 last belongs to the group which has twelve costal grooves. A. tigrinum 

 has the internl nares no more widely separated than are the outer; the 

 limbs of the vomerine V ^-re decidedly concave, and the inner series of 

 teeth are about twice the length of the outer. It is also a rather long, 

 bodied species, the distance from the snout to the axilla being contained 

 in the distance from the snout to the groin nearly 2.4 times, while in A. 

 copeanum the latter distance is but twice the former. Indeed, this form 

 differs from all others, in the shortness of the body, or the equality of 

 the distances from snout to axilla and from axilla to groin. A. hicolor 

 approaches it most nearly, but this species differs further in having no 

 traces of the yellow spots so characteristic of that form. A. copeanum 

 has also a broader and more depressed head, a more compressed tail, 

 and longer limbs. 



A. hicolor is described as having the palatine teeth in three entirely 

 transverse series; as having a very short muzzle, and as beiug more or 

 less spotted. A comparison of some of the dimensions of the two spQ- 

 1951— Bull 34 5 



