1. STERN ABCTI us. 3 



end of the snout than to tho gill-opciiing ; the mouth is cleft to 

 below the orbit ; vent immediately behind tlie vertical from the 

 orbit. Brown or black, with a white band along the median line 

 of the upperside of the head, sometimes extending along the back ; 

 the thin portion of the tail with two white rings. A. 140-162. 



Brazil and Surinam. 

 a. Half-grown. Pard. (A. 151.) 



h. Half-grown. Santarem. From Mr. Bates's Collection. (A. 140.) 

 c. AdiUt. (A. 153.) 



2. Sternarchus brasiliensis. 



Heinkardt, Vidcnsk. Meddel. naturli. Foren. Kjobenh. 1852 ("1853) ; or 

 Wiegm. Arch. 1854, p. 182. 



Closely allied to St. alhifrons. 



Uniform dark brown. Mouth rather short. Eyes very small. 

 Vent at a short distance behind the eyes. A. 177-185. 

 Kio das Yelhas. 



3. Sternarchus nattereri. 



Steindackner, Sitz(j-<hei: Ak. Wist. Wien, 1868, Iviii. p. 251, taf. 2. 

 fig. 1. 

 The upper profile of the snout descends in a strong curve from 

 the ua]ie to the mouth. The length of the snout is rather less than 

 one-half of that of the postorbital part of the head ; mouth small, 

 scarcely extending to the minute eye. Vent below the eye. Inter- 

 maxillary teeth none. The depth of the body is once and a half the 

 length of the head. Uniform brownish. A. 197. (Steind.) 

 Barra do Rio Negro. 



4. Sternarchus schotti. 



StcutditcJmer, I. c. p. 252, taf. 1. figs. 1, 2. 



The upper profile of the snout is but little convex ; length of the 

 snout rather less than one-half of that of the postorbital part of the 

 head. Mouth small, not extending to the eye. Intermaxillary teeth 

 forming a double scries. The depth of the body equals the length 

 of the head. (Steind.) 



Barra do Rio Negro. 



5. Sternarchus bonapartii. 

 Castelii. I. c. p. 92, pi. 45. fig. 2 ; Kaup, Apod. p. 12G. 

 Uniform brownish ; head blackish. Cleft of the mouth very wide, 

 extending behind the ej-es. Yent before tlie eyes, at a short distance 

 from the mandibulary sj'mphysis. A. 165. 

 River Amazons. 

 Tliia species appears to have l)cen described from a skin. 



