DEC. 28, 1916. FISHES OF PANAMA MEEK AND HILDEBRAND. 279 



of dorsal and base of upper ray of caudal; caudal fin forked, the lower 

 lobe the longer, its lower fulcra free, forming a flat spur at margin of the 

 enlarged scale of each side; anal fin long, its origin in advance of dorsal, 

 about midway between anterior margin of eye and base of caudal; 

 ventral fins reaching nearly or quite to origin of anal; pectoral fins long, 

 overlapping the ventrals, inserted notably nearer tip of snout than origin 

 of anal. 



Color pale green above, with a dark vertebral band; sides silvery. 

 A faint silvery lateral band usually present; a distinct shoulder spot or 

 bar. Fins reddish yellow; a large oval caudal spot, which does not 

 extend either on the middle or the outer rays of the caudal. 



Of this species 64 specimens, ranging from 30 to 60 mm. in length, 

 were preserved. All are from the Rio Chame, the only place where it 

 was seen. The type is a male, 58 mm. in length. 



This species is closely related to G. atricaudata and G. choccensis 

 Eigenmann, assuming an intermediate relationship, agreeing more 

 nearly in color with the latter and in structure with the former. From 

 G. atricaudata it is easily distinguished by the oval caudal spot which 

 does not extend on the outer rays of the caudal, and the more prominent 

 shoulder spot. No structural differences are evident, and it is possible 

 that the two intergrade, but in the present large collection this is not the 

 case. From G. choccensis it differs in the more numerous scales between 

 the lateral line and base of anal (4 in G. choccensis, 6 in the present 

 species), and the rows in the present species are more strongly decurrent 

 above base of anal. The spur on lower lobe of caudal is notably shorter 

 and broader in G. intermedius and the ray above the spur is flattened and 

 expanded, while in the former it is normal. 



22. Genus Astyanax Baird & Girard. 



SARDINAS. 

 Astyanax Baird & Girard, Proc. Acad. Nat. Sci. Phila., 1854 26, and 



U. S. Mex. Bound. Survey, 1859, 74 (type Astyanax argentatus 



Baird & Girard). 

 Pcecilurichthys Gill, Ann. Lye. Nat. Hist. N. Y., VI, 1858, 54 (type 



Pcecilurichthys brevoortii Gill). 



Body more or less elongate, compressed, depth usually more than 2 

 in length; second suborbital narrow, leaving a naked triangular area 

 below suture between first and second suborbitals; premaxillaries with 

 2 series of teeth, the first series with several teeth on each side, the second 

 series equal or graduated, usually 10, sometimes 8 in number; lower 

 jaw with strong teeth anteriorly, usually abruptly smaller, conical ones 



