296 CHKOMIDES. 



produced, extending beyond the root of the caudal. The free portion 

 of the tail is rather higher than long. Caudal subtruncated, its 

 length being a little less than one-fifth of the total. Pectoral much 

 shorter than the head, equal in length to the ventral, which does not 

 extend on to the vent. 



18. Heros coryphsenoides. 



Heros coryphaenoides, Heck. Brasil. Flms-Fische, p. 373. 

 niger, Heck. I. c. p. 375. 



»-T^4- A.^,. L.lat.33. 



The fold of the lower lip is interrupted in the middle ; six series 

 of scales on the cheek. The height of the body is a little less than 

 one-third of the total length (with the caudal). Two black spots 

 behind the eye, and sometimes a third on the opercle; a dark cross- 

 bar below the twelfth and thirteenth dorsal spines. 



Kio Negro. 



19. Heros deppii. 



Heckel, Brasil. Fluss-Fische, p. 382. 



D. ^. A. |. L. lat. 30. L. transv. 17. 



The fold of the lower lip is interrupted in the middle ; six series 

 of scales on the cheek. The length of the head is contained once and 

 a fourth in the greatest depth of the body, and thrice and three- 

 fourths in the total length (with the caudal). The length of the dor- 

 sal spines is one-fourth of that of the head. Brownish ; tail with six 

 obsolete dark cross-bands, the last band with a black spot. {Heck.) 



Mexico. 



20. Heros montezuma. 



Heckel, Brasil. Fluss-Fische, p. 383. 



D.{^. A. A L. lat. 30. 



The fold of the lower lip is interrupted in the middle ; five series 

 of scales on the cheek. Body with six dark cross-bands, the last 

 round the root of the caudal and marked with a black spot. (Heck.) 



Mexico. 



21. Heros godmanni. 



D. l|ilZ. A. A L.lat.33. L. transv. 5/13. 



The fold of the lower lip is interrupted in the middle; seven series 

 of scales on the cheek. The height of the body is contained twice 

 and three-fourths in the total length (without caudal). Head grey- 

 ish-olive ; cheeks and body reddish-oUve ; an irregular blackish band 

 proceeds from above the pectoral to a black spot in the middle of the 



* Is not this a misprint ? 



