THE BATRACHIA OF NORTH AMERICA. 115 



tus. Tliey are the ouly Amblystomidas with cyliudric tail. They differ 

 as follows : 



I. Folds of the tongue radiating from a longitudinal farrow ; vomerine teeth not ex- 

 tending external to internal nares ; tail rounded in section. 



a Cornua of otoglossal cartilage turned forwards; muzzle very short; jaws 

 equal; legs short, separated from each other, when appressed, by four inter- 

 spaces ; blackish, with light cross-bands on head, body, and tail. L. annulalus. 



aa-Cornan of otoglossal cartilage turned backwards ; muzzle elongate, project- 

 ing beyond chin ; legs longer; separated, when appressed, by two intercostal 

 spaces ; grayish-brown, with numerous pale transverse lines, which forin a 

 reticulate pattern across the tail L. leptwus. 



LINGU^LAPSUS ANNUL ATUS Cope.* 

 American Naturalist, 1887, p. 88. 

 Amhlystoma annulatum Cope, Proc. Amer. Philos. Soc, 1887, p. 525. 



This species resembles the Ghondrotus microstomus rather than the 

 G. cingulatus or the L. lepturus. However, it approaches the last-named 

 species in the form and length of its tail, and exceeds that and all the 

 other species of the famil^^ in the length of that part of the body. 



The muzzle is very short, and the head is not distinguished from the 

 neck. The legs are short, and when appressed to the sides are sepa- 

 rated by a space of three and parts of two other intercostal spaces, 

 equal to four spaces. The tail is in section cyliudric at base, and widely 

 oval to near the extremity, where it is more narrowly oval. It is not an- 

 gulate, and has no dermal margin on the middle line above or below. Its 

 length exceeds that of the head and body by the length of the anterior 

 foot, and it may have been longer, as the extremity is injured. 



The head Is short, and the width enters the length to the groin six 

 and a quarter times. The front is convex to the upper lip or profile, 

 and transversely between the orbits. The parietal region is very con- 

 vex transversely. The width between the cauthi oculorum behind ex- 

 ceeds the length from the same point to the end of the muzzle. The nos- 

 trils present anteriorly, and they are not quite so close together as in the 



Fig. 25. Lingumlapsus annulatus. No. 11564; natural size, except Fig. 5. 



L. Upturns,, as the distance between them measures two-thirds the width 

 between the eyelids. The vomerine teeth form two transverse fasciculi, 

 of several rows of teeth each, between the choanse, convex forwards, 

 and separated on the middle line by a very short interval. 



The skin is perfectly smooth. There is a postgular fold, and the 

 sides are crossed by thirteen folds, with space enough at the axilla for 

 '~^ * Plate 24, figs. 10, 11. 



