4. CHAT0ESSU8. 409 



sharply serrated, there being twelve scutes behind the ventrals. 

 Silvery, a small round blackish spot on the shoulder. 

 Lake Peten. 



a-d. Typical specimens, 3-4 inches long. From Mr. Salvin's Col- 

 lection. 



5. Chatoessus mexicanus. 



B. 0. D. 14. A. 25. L. lat. 40. L. transv. 13. 



The dorsal filament reaches to the end of the anal fin. Scales very 

 deciduous. The height of the body is contained twice and three- 

 fourths in the total length (without caudal), the length of the head 

 thrice and one-fifth. The diameter of the eye equals the length of 

 the snout, and is one-fourth of that of the head. Jaws even in 

 front. Cleft of the mouth wider than deep, the lateral portion of 

 the maxillary being well developed, and extending to below the 

 front margin of the eye. Oiigiu of the dorsal fin midway between 

 the end of the snout and the root of the caudal, hnmediately behind 

 the base of the ventrah. Abdomen sharply serrated, there being nine 

 scutes behind the ventrals. Silveiy, a small round blackish spot on 

 the shoulder. 



Central America. 



a-b. four inches long. Mexico, From M. Salle's Collection. 



c. Young. New Orleans. 



d. Several examples, from 3 to 4 inches long. Purchased of Mr. 



Cuming. — Said to be from Boero, East Indies. 



6. Chatoessus maculatus. 



Richards. Ichthyol. Chin. p. 308; Cuv. ^- Val. xxi. p. 108. 

 B. 6. D. 15. A. 26-28. L. lat. 48. L. transv. 20. 



The dorsal filament reaches to the end of the anal fin. Scales 

 very deciduous. The height of the body is contained twice and 

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

 head thrice and a half. The diameter of the eye is equal to the 

 length of the snout, and two-ninths of that of the head. Jaws 

 nearly even in front. Cleft of the mouth deeper than wide, the 

 lateral portion of the maxillary being well developed, and extend- 

 ing beyond the. front margin of the eye. Origin of the dorsal fin 

 nearer to the end of the snout than to the root of the caudal fin, 

 and conspicuously in advance of the base of the ventrals. A blackish 

 spot on the shoulder, sometimes followed by a series of similar spots. 



China; Formosa. 



a-c. From 6 to 9 inches long. Formosa. From Consul Swinhoe's 

 Collection. 



7. Chatoessus cepedianus. 



Megalops cepediana, Lemcur.^ Journ. Ac. Nat. Sc. Philad. i. 1817, 



p. 361. 

 Chatoessus cepedianus, Cuv. S( Val. xxi. p. 99, pi. 012. 



