13. AMBLYSTOMA. 39 



Synopsis of the Species. 



I. Series of palatine teeth extending to oxternal fissure of choanae ; 



plicae of tongue radiating from behind. 



A. Costal grooves ten or eleven. 



10 costal grooves ; habit very stout ; 

 blackish, blotched or marbled with 



grey 1. talpoideum, p. 40. 



1 1 costal grooves ; habit stout ; blackish, 



with grey fasciae 2. opacum, p. 40. 



10 or 11 costal grooves ; blackish, with 



round yellow spots 3. punctatum, p. 41. 



11 costal grooves ; habit slender ; tail 

 shorter than the head and body ; lead- 

 coloured, with small yellow spots . . 4. conspersum, p. 42. 



11 costal grooves; body stout and 

 heavy ; two very distinct tarsal 

 tubercles ; blackish above, with large 

 irregular yellow spots; yellow beneath. 5. bicolor, p. 42. 



11 costal grooves ; head large ; paro- 



toids very distinct ; uniform brown . 12. paroticum, p. 48. 



B. Costal grooves twelve. 



1. Two distinct tarsal tubercles. 



Head large; brown or blackish, with 



yellow markings 6. tigrinum, p. 43. 



Head smaller; canthus rostralis di- 

 stinct ; tail considerably longer than 

 head and body 7. xiphias, p. 45. 



Palatine teeth in four distinct patches, 



with decided intervals 8. trisruptum, p. 45. 



2. No or one indistinct tarsal tubercle. 



Head small ; body much elongated ; 



limbs not meeting when adpressed. . 9. jeffersonianum, p. 46. 

 Head small ; body less elongated ; limbs 



meeting when adpressed 10. persimile, p. 47. 



Limbs nearly meeting when adpressed ; 



a light vertebral band ; toes long . . 11. macrodactylum, p. 48. 



II. Series of palatine teeth not extending beyond choanae ; 



plicae of tongue radiating from behind. 



12 costal grooves ; snout short, uniform 



kl ac k 13. aterrimum, p. 49. 



12 costal grooves ; snout long ; brown, 



marbled with darker 14. tenebrosum, p. 49. 



14 costal grooves; brown, with light 



spots on the sides ; below yellowish . . 15. texanum, p. 50. 



