THE BATRACHIA OF NORTH AMERICA. 



107 



FroDortional dimensions. 



4708. Chilowyuck. 

 Head : 



Length of gape of mouth to its width more than half. 



Width to distance from snout to guhir fokl contained 1:^ times. 



Width to distance from snout to groin 4| times. 



Width to distance from snout to hehind anus -\- h times. 



From snout to gular fold contained in distance from snout to groin 3^ times. 



From snout to gular fold contained in distance from suout to behind 



anus -\-i times. 



Distance anteriorly between eyes in length of orbit 2 times. 



Distance from eyes to nostrils in length of orbit little over 1 time. 



Distance between external nostrils in length of orbit little over 1 time. 



Distance between internal nostrils in length of orbit about 1 time. 



Width of tongue to width of head little over ^ time. 



Limbs: 



Free portion of longest finger contained in distance from elbow to tip 2| times. 



Distance between outstretched toes in length from snout to groin equal. 



Measurements, in inches. 



Length (measured along axis of body) : 



From suout to gape 50 



From snout to gular fold 95 



From snout to armpit 1. 50 



From snout to groin 3. 10 



From snout to behind anus 3. 80 



From snout to end of tail 7. 20 



Head : 



Width of head 75 



Width of tongue 40 



Length of orbit 25 



Distance between eyes anteri- 

 orly 45 



Distance between outer nostrils . 25 



Head — Continued. 



Distance between inner nostrils 



Tail: 



Height of tail where highest.. - 

 Breadth of tail where highest.. 



Limbs: 



Free portion of longest finger.. 

 From elbow to tip of longest 



finger 



Free portion of longest toe 35 



From knee to tip of longest toe 1. 00 

 Distance between outstretched 

 toes 3, 05 



24 



83 



CHONDROTUS DECORTICATUS Cope. * 

 American Naturalist, 1887, p. 88 (February). 

 Ambhjsioma dccorticatmn Cope, Proceeds. Amer. Philosoph. Soc, 1886, p. 522. 



This species has a good deal of affinity in its character to the G. 

 paroticus Baird, but it dififers in important points of structure, as well 

 as in its external appearance. 



Its general proportions are not slender- and the limbs, especially the 

 posterior ones, are very stout. The tail is long, and is compressed from 

 the base. It does not bear a fin at any part. Its length, in the single 

 specimen before me, is equal to that of the head and body (including the 

 vent), less the distance from the eye to the end of the muzzle. The 

 head is short and the muzzle is contracted, and is steeply rounded in 

 profile. The distance from the muzzle to the axilla enters the length 

 from the axilla to the groin 1^ tim es. The width of the head enters 



* Plate 24, figs. 8, 9. 



