382 Illinois State Lahoratonj of Natural History. 



slightly free at the sides. Palatine teeth approximating those 

 on the premaxillaries, the series interrupted posteriorly. In- 

 ternal nares large, outside the palatine teeth. Branchial tufts 

 plumose. Gular fold present. Tail short, strongly compressed, 

 with extensive membranous expansions above and below. 



Necturus maculatus, Rafinesqne. Mud Puppy, Water Dog. 



Nect'urus maculatus, Eaf., Jour. Phys., 1819, vol. 88, p. 417. 

 Triton lateralis. Say, Long's Exped. to the Rocky Mts., 1823, 1., 



p. 5. 

 Men oh ranch as tateraJis, Harlan, Ann. N. Y. Lye, 1824, L, p. 233. 



-De Kay, Nat. Hist. N. Y., Kept, and Amph., 1842, p. 87, pi. 



18, fig. 45.— Ilolbr., N. A. Herp., 1842. V., p. 115, pi. 38, and 



also p. Ill, pi. 37. 

 Nactnrus lateralis, BaiTd, Jour. Acad. Nat. Sci. Phila., 2d Ser., 



1849, I., p. il90. 

 Menohranclins lateralis, Dum. et Bibr., Erp. (ien., 1854, IX., p. 



183.— Smitli, Tailed Amphibians, 1877, p. 17. 

 Necturus uiaciihdvs, Boulenger, Cit. Batr. fSal. in Coll. Brit. Mus., 



2d. ed., 1882, Sal. Caulata. p. 84. 

 Necturus luterolis, Davis and Rice, Bull. III. State Lab. Nat. 



Hist., I., No. 5, 1883 (inserted under errata); Bull. Chicago 



Acad. Sci.. 1883. 



Total length about one and a half feet. Body stout. Head 

 depressed, very wide at base, somewhat contracted before the 

 eyes. Eyes small, embedded, lateral. Mouth not very large, 

 with large expansions of the skin forming fleshy lips. Jaws 

 angalate in front; palatine teeth approximating and parallel 

 with the maxillary teeth, interrupted posteriorly. Internal 

 nares large, opening outside the palatine series of teeth. 

 Tongue very large, extensively free in front. Branchial tufts 

 large; gill-opening not large, crossed by but one free arch. 

 Gular fold distinct. Limbs moderately strong; digits without 

 webs or lateral expansions of the skin. Vent with plicate, 

 margins. Tail spatulate; stout and cylindrical at the base, 

 strongly compressed and increasing in height distally, with a 

 fin-like expansion above and below. 



Color above dark gray, with obscure subcircular dark spots 

 and minute dark specks. An obscure dark band extends along 

 the snout and through the eye, behind which it may terminate 



