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THli HATUACUIA OF NOKl'lI AMKKICA. 71 



Inrli H. 



VVidtli of lu'iid 70 



Foi't'-iinii tVoiii elbow 75 



Hi ml It';^ (Voin knoc IK"> 



(tri'iitiint lifij;lit of tail (!;"» 



Stretch of liiiul logs ±80 



III this variety tlio nppreciable diflVTOiice in color consists in tlio teinl- 

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

 more or less continent. 



I tind no ditference in form between the two series, the snpposed A. 

 I'lmcopum now at iniiid (.{SiM) and 38S7) and young specimen oi A.luri- 

 (iitm (as .'{J)?!), Irom Marietta, Ohio. The color above is a light reddisii- 

 brown ; tln^ sides a sharply delined dusky l)rowii ; th<> belly of a lighter 

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

 tions of whitish spots in tiie belly and sides. 



Tiie following eximination of the nature of the variation to which 

 the Eastern foi-m of this species is subject and their <!auses may be 

 a«lded to the preceding diagnosis from liaird's manuscript. 



The color varieties are as follows: 



rr. Uniform brown above, yellow below, sides darker brown ; 3S87, 

 381)!); three specimens. 



fi. Blackish-blown, with sniail scattered yellow spots above and large 

 ones on the sides, in the majority of tin* individuals; Nos. 4003, 4()!)7, 

 4(591, 3!)74, 38t)5, li'Mi, lim.i, 3!)70, ;{•.).">(), 1»{)71, 401)2, 47()(i, and eight in 

 in museum of the i'iiiladelphia Academy. 



;'. Neaily e(pially and not coarsely marbled above, with blotches of 

 deep brown ami bright yellow ; 40.")!). 



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

 type of ^l. imjfus, from New Orleans ; one specimen. 



The above <!oloration 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 behiinl the internal narcs; 

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

 consin, (I0!)3(/), and cme from Louisiana, 470G. All are fully developed 

 and many ot the l.irgest size; one of 4()!)3 has the postnarial denial 

 series separated on om^ side. Of these the largest example of the sjie- 

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

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

 head and body. Tiie same relations are seen in two New Jeisey speci- 

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

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

 the long«'r body (4.5 times), but the tail shorter than head and body: two 

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

 tail and body scarcely occurs in connection with any other ty|)e of deu- 



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