19. TETRAQONOPTERTJS. 323 



the dorsal fin is vertically immediately behind the root of the ventrals. 

 The pectoral reaches to, or a little beyond, the base of the ventrals. 

 An indistinct round dark spot behind the shoulder, above the lateral 

 line ; generally a band-like blackish spot on the root of the caudal, 

 sometimes extending forward to the humeral spot. Frequently the 

 blackish band is entirely or partly replaced by a silvery band ; some- 

 times the spots and bands are absent. 

 Central and South America. 



a, b-d. Adult and half-grown. Brazil. Presented by Lord Stuart. 



e-h. Adult and half-grown. "Western Ecuador, From Mr. Fraser's 

 Collection. 



i-l. Adult and half- grown. Huamuchal. From the Collection of 

 Messrs. Godman and Salvin. 



vi-o. Adult. Rio Guacalate. From the Collection of Messrs. God- 

 man and Salvin. 



])-r. Adult. Rio Chisoy, Vera Paz. From the Collection of Messrs. 

 Godman and Salvin. 



s-ii, v-i/, r-W. Adult. Mexico. From M. Salle's Collection. 



i-K. Half-grown. Cordova. Purchased of M. Parzudaki. 



X. Adult. Central America. From Mr. Gould's Collection. 



/(. Half-grown. Guatemala. From Mi\ Salvin's Collection. 



If a figure published by Castelnau in Anim. Amer. Sud, Poiss. 

 pi. 32. fig. 2. be correct, it cannot have been taken from T. fasciatus, 

 which has considerably smaller scales and a less elevated body than 

 are represented in that figure. 



13. Tetragonopterus microstoma. 



? Tetragonopterus fusco-auratus, Castehi. Anim. Amer. Sud,Poiss.-^.&6. 

 pi. 33. fig. 2. 



D. 11. A. 27-29. L. lat. 35-37. L. transv. ^. 



Very similar to T. fasciatus, but with shorter maxillaries. 



The height of the body is contained twice and two-thirds or twice 

 and three-fourths in the total length (without caudal), the length of 

 the head four times and one-third or four times and one-fourth. 

 Interorbital space convex, its width being considerably more than the 

 diameter of the eye, which is two-sevenths of the length of the head. 

 The upper profile is veiy little concave above the parietal region. 

 The maxillary does not extend beyond the vertical from the front 

 margin of the eye. The origin of the dorsal fin is vertically behind 

 the root of the ventrals. The pectoral reaches to, or a little beyond, 

 the base of the ventrals. An indistinct round dark spot behind the 

 shoulder, above the lateral line ; generally a band-like blackish spot 

 on the root of the caudal, both spots being united by a silvery band. 

 Sometimes the spots and bands are absent. 



Eahia. 

 a, b-d, e-i, Jc-o. Adult, half-grown, and young. Bahia. From Dr. 

 0. Wucherer's Collection. 



y 2 



