THE BATKACHIA OF NORTH AMERICA. 71 



Inch' 3. 



Width of head - 70 



Fore-arm from elbow 75 



Hiud leg from knee 95 



Greatest height of tail 65 



Stretch of hind legs "^- 80 



In this variety the appreciable difference in color consists in the tend- 

 ency to transverse or vertical bars of yellowish on the side of the tail 

 more or less confluent. 



I find no difference in form between the two series, the supposed A. 

 episeopum now at hand (3899 and 3887) and young specimen of A. luri- 

 dum (as 3971), from Marietta, Ohio. The color above is a light reddish- 

 brown ; the sides a sharply defined dusky browu ; the belly of a lighter 

 shade of the color of the back. There are some very obsolete indica- 

 tions of whitish spots iu the belly and sides. 



The following examination of the nature of the variation to which 

 the Eastern form of this species is subject and their causes may be 

 added to the preceding diagnosis from Baird's manuscript. 



The color varieties are as follows; 



a. Uniform brown above, yellow below, sides darker brown; 3887, 

 3899 ; three specimeus. 



/3. Blackish-brown, with small scattered yellow spots above and large 

 ones on the sides, iu the majority of the individuals; Nos. 4003, 4097, 

 4691, 3974, 3895, 3966, 3983, 3970, 3950, 2971, 4692, 4706, and eight in 

 in museum of the Philadelphia Academy. 



y. Nearly equall3^ and not coarsely marbled above, with blotches of 

 deep brown and bright yellow ; 4059. 



6. Entirely yellow, with brown linear patches irregularly arranged ; 

 type of A. ingens, from New Orleans ; one specimen. 



The above coloration varieties, it will be observed, coincide in part 

 with those of Western individuals. 



The conditions of preservation of immature stages in the dentition 

 are as follows : 



a. Palatine series nearly entirely transverse behind the internal naresj 

 eight specimens, all from New Jersey except two from Root River, Wis- 

 consin, (4093a), and one from Louisiana, 4706. All are fully developed 

 and many of the largest size; one of 4093 has the postnarial dental 

 series separated on one side. Of these the largest example of the spe- 

 cies is from Root River. With the other mentioned, the width of the 

 head enters the length to the groin 4.5 times, and the tail is longer than 

 head and body. The same relations are seen in two New Jersey speci- 

 mens. Two from the latter State have the long tail, but the width of 

 the head is only one fourth length to groin, while one of the same has 

 the longer body (4.5 times), but the tail shorter than head and body ; two 

 specimens have both the short body and tail. The elongation of the 

 tail and body scarcely occurs in connection with any other type of den- 



