THE BATRACITTA OF NORTH AMERICA. 89 



AMBLYSTOMA JEFFERSONIANUM Green. 

 (Plate 25, fig. 9.) 



Cope, Proceeds. AgjmI. Pbila., 1867, p. 195, Straucli, Salara., p. 64; Bou- 

 lenger. Cat Batr., Grad. Brit. Mns., cd. ii, 1832, p. 46, PI. ii, fig. 2. - 

 Salamandra jcffersoniana, Green, Contr. Maclurean Lyceum, p. 4 ; Holbr., N. A. Harp., 



V, p. 51, PI. 14. 

 Xiphonnra jeffersoviana, Tsclmdi, Batr., p. 93; Dnm. & Bibr., p. 161. 

 Triton niger, Do Kay, N. Y. Faun., iii., p. 85, PI. 15, fig. 35. 

 Salamandra {/ranulata, De Kay, N. Y., I. c, p. 78, PI. 23, fig. 66; ITolbr., N. A. Ilerp. 



v,p.63.' 

 Amhi/stomajeffcrsoniava, Baird, Journ. Ac. Pliila. (2), i, p. 283. 

 AmbI y stoma fnscum, Hallow., Jouru. Ac. Pliila. (2), iii, p. 355, 1865. 

 A mhlystoma jeffersonianum., var. fnscum., Cope, Proc. Ac. Phila., 18(57, p. 197 ; Boulen- 



ger, Cat. Batr. Grad. Brit. Mus., ed. ii, 1882, p. 46. 



Costal grooves twelve; mucous pores on each side of the muzzle not 

 extending beyond the orbits. Teeth transverse, or nearly so, in three 

 series. No or one indistinct plantar tubercle. Exterunl and internal 

 nares equidistant ; lead colored to brown and black, with or without 

 pale or distinct lateral spots. 



This definition covers a considerable range of variation, which is ex, 

 pressed in the following diagnoses of three subspecies : 



Width of head 4 to 4.5 times iu length to groin ; length of eye 2.5 times iu width of 

 head above ; uniform lead color to brown A.j. jejfersomannm. 



With of head 5 times in length to groiu ; length of eye one half width of head be- 

 tween anterior canthus of eyes; black with white spots on sides and belly. 



A.j. laterale. 



Width of head 5 times to groin ; length of eye 1.75 in width of head as above ; tooth 

 series slightly convex ; slender; uniform lead color A. j. platineum. 



Amhlystoma jeffersonianum jeffersonianum Green. 



The synonymy given under the head of this species in general is 

 applicable to this subspecies only. 



Body decidedly more slender and elongated than in A. imnctatum. 

 Skin everywhere smooth, and showing through the transparent epi- 

 dermis the ends of the glands whicli thickly stud the entire surface. 

 Under a lens are seen numerous small, rounded, shallow pits between 

 the glands, not on them. The contraction of the skin in strong alcohol 

 between these glands would readily impart a granulated appearance. 

 The glandules are accumulated into a thin stratum above the parotoid 

 groove. 



The head is elongated, with the muzzle obtuse or truncate, the great- 

 est width contained 1.5 times in the distance to the gular fold, and from 

 four and a half to five times to the groin ,• the distance to the gular fold 

 is contained 3| times in that to the groin. The eyes are rather large 

 and situated far behind. They are distant once the length of the orbit 

 from the nostrils (which are separated by nearly twice this lengtli ). The 

 anterior extremities of the orbit are distant more than twice their lenoth. 



