186 DIILLKTIN :U, UNITED STATES NATIONAL MUSEUM. 



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Giilar fold well niarkcd; costal folds foiirfecii, not contiiinod on back 

 or abdomen. The limbs, and especially the digits, are .slender; appressed 

 to the side, they fail to meet by the length of the lin«ers. The form of 

 the body is .slender and cylindric, and the width of the head enters the 

 total length to the groin seven times. The tail is, as in .1. liifjuhns, 

 eqnal to the head and body in length, cylindrical, slender, and .slightly 

 compres.scd at tip. 



The thnmb po.ssesses a short phalange, but no part of it is free, as in 

 A. iKfjiihris; on the other liand, all the phalanges of the other toes of 

 both feet are more slender than the .1. luguhris, and the distal ones 

 distinctly truncate and .slightly emarginate, with dermal thickening 

 below tip. All are qnite free. Number o'' phalanges, 1-2-3-2, l-2-;}-3-2. 



Coloration.— Hides and nape greenish-gray; toj) of hea<I and dors;i| 

 region behind in the form of a serrate band, with the tail, black; below 

 yellowi.shbrown; limbs black above, brown below; inferior regions un- 

 spotted. 



1 4 3 5 



Fid. 45. Aiitoilaxferrciin. Xo. (JTOJ. Kort riupi|ii,i, 1, j. 



Miaxitivmctils, in inches. 



Iiiolu ... 



Loiifjtli, .axial, from .snout to rictus oris ;-J 



Leiigtli. iixial, IVoiii sii;)iit to axilla TO 



l.cn^rtli, axial, from snout to <rroin l.T.'> 



L(Mi};tli, axial, I'rom snout to end of vent ',*. 



Lenf^tli, axiiil, from .snout to end of tail :i. (i.") 



Lt'iifrtli of forc-limh i") 



Length of fore-foot 'J 



Li'iigth of liiud liml) 'i.'i 



Lt'i);;tli of 111 ml foot *J<i 



Widtli of hind-foot sole 11 



Width of head at rictus oris 'JH 



Width ofhodyat middle )>\ 



Width of body at sacrum 2 



The maxillary bone displays the same sudden deeurvatnre anterior to 

 and below the orbit which the A. hif/uhris does, but it is less marked; 

 in consecpience, the commissure of the mouth is less sinuate. The long 

 mandibidar and maxillary teeth, while of similar structure, are le.ss de- 

 veloj^ed. IVf]iai».s larger specimens of this spi cies may be fuiiinl where 

 they may be larger, as in small specimens of .1. Iiif/iihri.s they are nearly 

 sinn'lar in proportions. 



Thoiigli nearly allied to the A. Iminhrh, the presefit species will never 

 be confounded with it. It is a much weaker Ibrin.an i does not disp|:i.\ 

 the characters of llic g(Miiis in .so .striking a degre'. The form of the 



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