426 



DE. GtJXTHER ON THE FISHES OF CENTRAL AMERICA. 



58. U.\IBRIXA XASUS. 



D 10 1^5. A. 18. L. lat. 54. L. transv. 6/14. 

 The height of the body is contained four times in the total length (without caudal), 

 the length of the head thrice and one-fourth. Snout much produced beyond the 



mouth, which is quite at the lower side of the snout. The diameter of the eye is twu- 

 thirds of the length of the snout, and two-fifths of that of the postorbital portion of 

 the head. Symphysial barbel very short, scarcely as long as the posterior nostril. 

 Prseoperculum distinctly serrated. The second and third dorsal spines are as long as 

 the head, without snout. Posterior margin of the caudal fin /-shaped, the upper lobe 

 being pointed, the lower rounded ; anal spine very feeble. The maxillary extends to 

 below the centre of the orbit. Silvery, fins blackish. 



One specimen, 10 inches long, was found by Capt. Dow at Panama. 



D. 10 



1 



\26' 



59. U-MBRIXA .iXALIS. 



A. 2/6. L. lat. 46-48. L. transv. 6/15. 



The height of the body is one-third of the total length (without caudal), the length 

 of the head two-sevenths. Snout compressed, rather deep, of moderate extent, longer 

 than the eye, which is two-ninths of the length of the head, and equal to the width of 

 the interorbital space. Snout overlapping the mouth, but not much protruding beyond 

 it. Barbel very short, scarcely as long as the posterior nostril. Prseoperculum 

 distinctly serrated. The second and third dorsal spines are not quite as long as the 

 head without snout. Caudal fin subtruncate. Anal spine very strong, more than half 

 as long as the head. The maxillary extends beyond the front margin of the eye. An 

 oblique dark streak runs along each series of scales. The spinous dorsal fin blackish. 



One specimen, 11 inches long, was found by Capt. Dow at Panama. 



