THE 15ATRAC11I.V OF NORTH AMHRiCA. 207 



DIEMYCTYLUS VIRIDESCEXS Raf. 



(Plates 36, figs. 3-4 ; 39; 40, figs. 5-9; 41, figs. 3-4 ; 42, fig. 3 ; 45, fig. 9; 49, fig. 4.) 



Hallow., Joiirn. Ac. Phila. (N.s.)iii, p. .303; Cope, Proceed Ac. Pliila., 

 lfc'59, p. 126. 



Tritarus {Diemijcfylus) viridescens Rafiu., Annals of Nature, 1820, No. 22. 



'J'ritiinis {Xoto2)hthahnus) mhiiatns Rafin., I.e., No. 24. 



SalcDiiandva stellio Say, Auier, Jouru., I, p. 264. 



fHahiinandra dorsaUs Harlau, Journ. Ac. Pliila., V, p. 121; Wied., Nova Acta Loop., 



carol., XXXII, p. 131. 

 Salaviandra symmelrica Harlan, I.e., p. 157; Holbr., N. A, Herp., V, p. 57, PI. xvii; 



DeKay, N. Y. Fauu , Reptil., p. 73, PI. xv, fig. 33; Wied., /. c, p. 125. 

 Salamandra millcpiinctata Storer Bost. .Jouru. N. H., ii, p. 60. 

 Snlamandra greeiiil Gray, Grilf. A. K., ix, Syu., p. 107. 

 Triloii dorsalis Holbr., ?.. c, p. 77, PI. xxv; Dum. &Bibr., p. 1.55. 

 Triton inUleimnctatits De Kay, I. c, p. 84, PL xv, fig. 34. 

 Notophthalinus mUuatus Baird, Jouru. Ac. Phila. (2), i, p. 284; Gray, Cat. Batr. Grad. 



Brit. Mus., ed. i, p. 22. 

 Kotoplithalmus viridescens Baird, I. c. ; Gray, I. c. p. 23. 

 Triton imnetatissimus Dum. &Bibr., p. 154. 

 Triton symmeiricus Dum. & Bibr., p. 154 ; PI. 107, Sg. 2. 

 BiemyetyJus miniatus Hallow., I. c. 

 Triton viridescens Straucb, Salam., p. 50. 

 Molge viridescens Boulenger, Cat. Batr. Grad. Brit. Mas., ed. ii, 1882, p. 21. 



Tills variable species is the aquatic salamander of the eastern region 

 of North America. Its distinctive characters have been already re- 

 iVricd to (pa ge 203), and will be more fully detailed under its appropriate 

 subspecies. These are two, as follows: 



Extrrual finger half as long as fourth or shorter; back with small black-edged red 

 spots D. V. viridescens. 



External finger more thau half as long as fourth ; no red spots on back, but large 

 black ones, which are present also on the tail D. v. vuridionalis. 



Diemyctylus viridescens viridescens Eaf. 



There are two forms of this subspecies, which have received the 

 names of viridescens and miniatus respectively. These having been 

 yhown to be stages of one and the same animal, they are not distin- 

 guished otherwise than as seasonal forms, which may be by reason of 

 the environment rendered permanent for a longer or shorter time. I 

 give, however, the characters that distinguish them. 



Crauial carime more prominent, and longer; tongue freer laterally; skin rough; 



chcek-xiits more frequently wanting; color red form miniatus. 



Cranial carina} less prominent, especially at the ends; tongue less free ; skin smooth; 



cheek- pits rarely wanting ; ground color olivaceous form viridescens- 



The form Miniatus never has a caudal fin-membrane, while it is gen- 

 erally present in the form Viridescens; but this is a seasonal character. 

 The characters above mentioned are not always combined as described, 

 and one or another may be wanting while the others are present. 



