176 



BUH ETIN 31, UNITED STATES NATIONAL MUSEUM. 



These varieties are, however, not difficult to recognize, especially as I 

 have observed, the 8. r. montanus. 



Proporlional dimensions of No. 3837. 

 Head : 



Length of gape of inoutli to its width about half. 



Width to distance from snout to gular fold ~. contained 1^- times. 



Width to distance from snout to groin about 6 times. 



From snout to gular fold contained in distance frona snout to groin 4A times. 



Distance anteriorly between eyes in length of orbit 2 orbits. 



Distance from eyes to nostrils in length of orbit 1 orbit. 



Distance between external nostrils in length of orbit about 1 orbit. 



Distance between internal nostrils in length of orbit less than 1 orbit. 



Limbs: 



Free portion of longest finger contained in distance from elbow to tip. 4 times. 



Free portion of longest toe contained in distance from knee to tip 3 times. 



Distance between outstretched toes in length from snout to groin one-half. 



Tail : 



Length from behind anus to rest of animal 1| times. 



Ijcngth from behind anus to total length two-fifths. 



Body : 



Width compared with that of head rather broader. 



Number of costal furrows (including inguinal) 15. 



Measurements of No. 3837, in incites. 



Length, measured along axis of body : 



From snout to gape 28 



From snout to gular fold 70 



From snout to armpit 1. 00 



From snout to groin 3.00 



From snout to behind anus 3.50 



From snout to end of tail 5. GO 



Head : 



Width of head 55 



Width of tongue 22 



Length of orbit 14 



Distance between eyes ante- , 



riorly 26 



Distance between outer nostrils. . 15 

 Distance between inner nostrils. .12 



Body : 



Circumference of belly 2.15 



Distance between armpit and 

 groin 2. 10 



Tail : 



Height of tail where highest.. . . 45 

 Breadth of tail where highest.. . 40 



Limbs: 



Free portion of longest finger.. . 10 

 From elbow to tip* of longest " • 



finger 40 



Free portion of longest toe 15 



From knee to tip of longest toe- . 51 

 Distance between outstretched 

 toes 1. 50 



Speler])es ruber flavissimus Hallow. 



Pseudotriton flavissimus Hallow., Proceed. Ac. Nat. Sci. Phila., 1850, 130. 



The form and proportions, excepting about the liead, are so simi- 

 lar to those of S. ruber, that it is unnecessary to repeat these charac- 

 ters. The digits are rather long, as usual in young S. ruber. The outer 

 ones, however, appear proportionally longer than in the latter. The 

 head, viewed from above, is narrower and more truncate. It is arched 

 but not wedge-shaped, depressed, the muzzle being much higher than 

 in S. ruber. Each side of the truncated snout is bordered by a vertical 

 ridge, which is a little exterior to the outer nostrils, and descends a 



