THE RATRACIIIA OF NORTH AMERICA. 



87 



Proportional dimensions. 



(Spec. 406S. Ocatc River, New Mexico. ?.) 



Head : 



Length of g.ipo of month to its width little more than half. 



Widlh to distance from snont to gnlar fold not qnite equal. 



Width to distance from snout to groin 4 times. 



From snout to gular fold contained in distance from snout to groin 2^^ times. 



Distance anteriorly between eyes in length of orltit 1} times. 



Distance from eyes to nostrils in length of orbit li times. 



Distance between external nostrils in length of orbit not quite 2 times. 



Distance between internal nostrils in length of orbit 2 times. 



Width of tongue to width of head over one-half. 



Limbs : 



Free portion of longest finger contained in distance from elbow 



to tip - little over 3 times. 



Free portion of longest toe contained in distance from knee to tip :>^- times. 



Distance between outstretched toes in length from s'loiit to groin., about equal. 



Tall : Ijeiigth from behind anus to rest of animal less. 



Body : Number of costal furrows (including axillary and inguinal) 12 (?)• 



Measurements, in inches. 



Length, measured along axis of body : 



From snout to gape 45 



From snout to gnhir fold 90 



From snout to armpit 1. 45 



From snout to groin 8. 15 



From snout to behind anus :i. 80 



From snout to end of tail 6. 80 



Head : 



Width of head 80 



Width of tongue 45 



Length of orbit 18 



Distance between eyes anteri- 

 orly , 50 



Distance between outer nostrils .22 

 Distance between inner nostrils . 30 



Body: Distance between armpit and 



groin 1.80 



Tail : ~ 



Height of tail where highest. .. . 4i) 

 Breadth of tail where highest. . . 24 

 Limbs: 



Free portion of longest finger.. . 2(5 

 From elbow to tip of longest 



iinger 90 



Free portion of longest toe 29 



From knee to tip of longest toe . . 96 

 Distance between ontsti'etched 

 toes .3. 00 



AMBLYSTOMA XIPIIIAS Cope. 



Proceeds. Acad. Phila., 18()7. p. 192; Stranch, Salam., p. G4; Boulenger, 

 Catal. Batr. Grad., Brit. Mus., ed. ii, 1882, p. 45. 



The specimen selected as tlie type of the description has the skin 

 soniewliat altered by alcohol, so that an exact description can not be 

 made of the glands, pits, and pores. Thero do3s not, however, appear 

 to be any material difference from A. tigrinum in these respects. 



The head appears small in proportion to the size of the animal, and 

 the cheeks unnsually swollen ; the width of the head is contained abont 

 fonr and one-half times in the distance to groin. The eyes are rather 

 small, distant three lengths of the orbit ; the inner nostrils are consider- 

 ably more distant than the outer. The tongue is large and fleshy, filling 



