30 HERPETOLOGY OF MICHIGAN. 



1902; Gibbs. Xotestein and Clark, 1905) ; Washtenaw County 

 (KSmith, 1907; Smith, 1879). 



AMBYSTOMA JEFFERSONIANUM (Green). 



Jefferson's salamander. 



(PI. II a.) 



Description: Body lon<>' and slender. Head elongate and flat: 

 e^'es large and prominent; nares small, situated at end of snout; 

 mouth large. Gular fold distinct, rising on sides of neck. Another 

 fold extends across the throat from a point just behind the corner 

 of the mouth and is met bv a groove running from the corner of 

 the eye. Twelve costal furrows and a dorsal groove. Limbs well 

 developed; toes long, slender and much depressed; no plantar 

 tubercles. Tail compressed and somewhat shorter than body. Skin 

 smooth and covered with numerous pores which may be clearlj' 

 seen under a lens. Teeth in four patches, the two central extending 

 to the inner nares. where they are met by the two lateral patches 

 Avliich form the posterior border of the inner nares. Tongue large 

 and thick. 



Ground color bluish or brownish black above, paler below. Sur- 

 face with or without pale blue spots. 



Measurements: Specimen Xo. 37926. 



Total length .118 



Length of head and body 070 



Width of head 010 



Eahits and Hahitat: Am'bxjstouia jeffersonianiim is secretive, and 

 during the day is found in damp, dark places. It is usually found 

 under logs and stones. It is extremely active, and, according to 

 Gadow (1901, p. Ill), a good climber, ''easily escaping out of high- 

 walled bell-glasses." 



Little has been done on the breeding habits of this salamander. 

 Smith (1911a, p. 19) states that the early spawning season "sug- 

 gests the possibility of an autumnal fertilization.-' Hahn (1908, 

 pp. 550-552) has taken the eggs in late segmentation stages on Feb. 

 28, at Mitchell, Ind., while Smith (1911a, p. 17) found the first 

 eggs on April 5, at Syracuse, Xew York. They are laid in small 

 grape-like masses that are usually hung on a leaf or stick. Piersol 

 (1910) has found the number of eggs in a single mass to be about 

 twenty. The hatching probably takes place in from thirteen to 



