284 CHARACINID-E. 



extremity of the operculum ; a brown band, running along the lateral 

 line, is as frequently absent as present. Caudal fin uniform dark- 

 coloured, without any spots. 

 Guianas, Brazil. 



a. Adult. British Guiana. 



b. Thirteen inches long : stuffed. Demerara. From the Collection 



of the Zoological Society. 

 j. Adult. Surinam. Purchased of Mr. Frank as Eryihrinus balteatus. 

 . d. Young. Essequibo. Purchased of Mr. Ehrhardt. 

 e. Adult. River Capin, Para. Purchased of Mr. Stevens. 

 /. Adult. River Cupai. Purchased of Mr. Stevens. 

 g-h, i-m. Adult and half-grown. Bahia. From Dr. 0. Wucherer's 



Collection. 

 n. Adult. Purchased of Mr. Stevens. 



2. Erythriiius gronovii. 



? Erythrinus salvus, Agass. in Spix, Pise. Bras. p. 41. 

 Erythrinus gronovii, Cm. $• Val. xix. p. 500 (not synon.). 



D. 11. A. 11. 



Very similar to E. unitceniatus, but with the caudal fin spotted. 

 Four or five irregular vertical streaks on the hind part of the body. 

 ( Val.) 



Guianas; ? Brazil. 



** Pterygoid teeth absent. 

 3. Erythrinus saimoneus. 



Erythrinus, sp., Gronov. Mus. Ichthyol. ii. p. 6. no. 154. »»1. 7. fig. 6. 



Synodus erythrinus, Bl. Schn. p. 397. 



Erythrinus saimoneus, Gronov. Syst. ed. Gray, p. 170. 



D. 10. A. 11. V. 8 L. lat. 33. 



The band of palatine teeth is extremely narrow ; pterygoid teeth 

 none. The height of the body is contained four times and two-thirds 

 or four times and three-fourths in the total length (without caudal), 

 the length of the head four times or thrice and three-fourths. 

 The length of the naked portion of the caudal fin equals the depth 

 of the free part of the tail, or the distance between orbit and extre- 

 mity of the operculum. The eighth dorsal ray is as high as the tail; 

 the longest anal ray two-fifths or half as long as the head. The 

 pectoral fin extends beyond the middle of the distance of its base 

 from that of the ventral, the ventral nearly to the vent. Upper and 

 lateral parts chestnut-brown ; belly and gill-membranes bluish ; a 

 black spot on the operculum, edged with silvery above. Dorsal and 

 anal rays with small round black spots; caudal nearly uniform 

 brownish violet, only traces of spots are visible towards the extre- 

 mity of the caudal rays ; pectoral and ventral blackish. 



Amazons ; Surinam. 

 a. Skin: type of the species. Surinam. From Gronow's Collection. 

 b-c. Seven inches long. River Cupai. Purchased of Mr. Stevens. 



