46. MYLETES. 377 



13. Myletes maculatus. 



Kner, Denkschr. Acad. Wus. Wien, 1860, xviii. p. 26. taf. 2. fig. 5. 

 D. 17-18. A. 37-39. V. 7. 



The height of the body is three-fourths of the total length (without 

 caudal), the length of the head a little more than one-fourth. Abdo- 

 minal serrature composed of from thirty -three to thirty-five spinous 

 plates. Anterior dorsal rays rather high ; none of the anal rays pro- 

 duced. Adipose fin rather long, its length being more than one-half 

 of that of the base of the dorsal fin. A large black spot behind the 

 shoulder ; body with rounded dark spots ; anal and caudal fins with 

 blackish margins. {Kner.) 



Rio Guapore. 



** Both series of intermaxillary teeth close together. 



14. Myletes altipinnis. 



Tometes altipinnis, Cuv. fy Val. xxii. p. 230. pi. 643. 

 D. 24-25. A. 38. V. 8. 



The height of the body is one-half of the total length (without 

 caudal) , the length of the head nearly one-fifth. Abdominal serrature 

 composed of fifty spinous plates. The posterior dorsal rays are rather 

 longer than the middle ones. The sixteen anterior anal rays rather 

 long. Adipose fin small. Coloration uniform. 



San Francisco, Rio Cipo. 



a. Twenty inches long : skin. Rio Cipo. Presented by Ch. Cum- 

 berland, Esq. 



15. Myletes discoideus. 

 Kner, Denkschr. Acad. Wiss. Wien, 1860, xviii. p. 30. 



D. 23. A. 34. V. 8. 



The height of the body is one-half of the total length (the caudal 

 included), the length of the head rather less than one-fourth. Ab- 

 dominal serrature composed of twenty-seven spinous plates. None 

 of the dorsal rays prolonged ; only the seven or eight first branched 

 anal rays are produced into a lobe, the others being short and sub- 

 equal in length. Adipose fin well developed. Sides with small brown 

 spots. {Kner.) 



Brazil. 



16. Myletes trilobatus. 



Tometes trilobatus, Cuv. § Val. xxii. p. 226. 



D. 23. A. 39. V. 8. L. lat. 90. 

 The length of the head is one-half of the height of the body, which 

 is two-fifths of the total length (with the caudal). Abdominal ser- 

 rature composed of twenty- eight simple spinous plates. The origin 

 of the dorsal fin is midway between the extremity of the snout and 



