DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 487 
Coloration uniform. Pharyngeal teeth very numerous and small, increasing somewhat 
in size downwards. 
Four examples, from 9 to 10 inches long, were obtained by Mr. Salvin in the Rio 
Usumacinta. 
271. PRISTIGASTER MACROPS. 
Ginth. Proc. Zool. Soc. 1866, p. 603; and Fish. vii. p. 461. 
Drsy Ab Glee ilatros: 
Abdominal profile but slightly convex, the greatest depth of the body being one-third 
of the total length (without cauda]); the length of the head is contained four times and 
two-thirds in the same length; eye very large, its diameter being more than one-third 
of the length of the head, and nearly equal to that of the postorbital portion of the 
head. ‘There are thirteen scales in the transverse series ascending from the origin of 
the anal fin to that of the dorsal, four of the series being above the lateral line. Origin 
of the dorsal fin midway between the root of the caudal and the scapula; origin of the 
anal nearer to the end of the snout than to the root of the caudal. A round black spot 
on the scapula. 
A specimen, 8 inches long, was found by Messrs. Dow and Salvin on the Pacific coast 
of Panama. 
€ 
272. PRISTIGASTER DOVII. 
Pristigaster aryenteus, Giinth. Proc. Zool. Soc. 1866, p. 603 (uot Cuy.). 
dovit, Giinth. Fish. vii. p. 461. 
DPA 5 Aso6. Vie lat. 51. 
Abdominal profile but slightly convex, the greatest depth of the body being two- 
sevenths of the total length (without caudal); the length of the head is nearly one-fifth 
of the same. Eye large, its diameter being two-sevenths of the length of the head, and 
two-thirds of that of the postorbital portion of the head. ‘There are eleven or twelve 
scales in the transverse series ascending from the origin of the anal fin to that of the 
dorsal, four of the series being above the lateral line. Origin of the dorsal fin much 
nearer to the root of the caudal than to the scapula; origin of the anal midway between 
the end of the snout and the root of the caudal. Scapula with an indistinct blackish 
spot. 
A specimen, 8} inches long, was found by Capt. Dow at Panama. 
273. CLUPEA LIBERTATIS. 
Meletta libertatis, Gimth. Proc. Zool. Soc. 1866, p. 603. 
Clupea libertatis, Giinth. Fish. vii. p. 433. 
Dien PAC OS ate 48. 
Closely allied to CU. thrissa. ‘The length of the head is contained thrice and two- 
