488 DR. GUNTHEE ON THE FISHES OF CENTEAL AMEKICA. 



tliiids ill the total (without caudal), the heiglit of the body thrice and a half, 'llio 

 origin of the dorsal iiii is much nearer to the end of the snout than to the root of the 

 caudal. The dorsal filament does nol, extend on to the caudal. Uniform silvery, with- 

 out humeral spot. 



A single example, 2^ inches long, was obtained by Messrs. Salvin and Dow at Libertad. 



274. Chatoessus petenexsis. 



Mek'tta peteiumsis, Giintli. Proc. Zool. Soc. 1866, p. 603. 

 ('hatoessus petenensus, Giintli. Fisli. vii. p. 408. 



D. 14-15. A. 20-23. L. lat. 40. 



The length of the head is two-sevenths of the total (without caudal) ; the height of 

 the body is contained thrice or twice and three-fourths in the same. The origin of the 

 dorsal fin is nearer to the end of the snout than to the root of the caudal, and in advance 

 of the ventrals. The dorsal filament does not extend on to the caudal. A small black 

 round spot on the shoulder. 



Four examples, from 3 to 4 inches long, were obtained by Mr. Salvin in liake Peten. 



276. EXGKAULIS POEYI. 

 Kiier & Steindacliner, Abhaiidl. baycr. Akacl. x. p. 23, Taf. 3. fig. 3. 



U. 16. A. 24. L. lat. 42. 



The length of the head is nearly equal to the height of the body, which is two-ninths 

 of the total (without caudal); snout very short and rather obtuse; eye rather larger 

 than one-fourth of the length of the head. The origin of the dorsal fin is nearer to the 

 root of the caudal than to the end of the snout ; origin of the anal fin opposite to the 

 middle of the dorsal. Pectoral fin reaching a little beyond the root of the ventral. 

 Upper and lower jaws with small teeth. 



Kio Bayano. 



277. EXGRAI'LIS JfACROLEPIDOTA. 

 Kncr & Steinclachucr, /. c. p. 21, taf. 3. fig. 2. 



B. 12-13. D. 12. A. 29. L. lat. 35. L. transv. 9. 

 The length of the head is two-sevenths of the total (without caudal), the height of 

 the body one-third. Snout pointed, very short. The diameter of the eye is one-fourth 

 (if the length of the head. The origin of the dorsal fin is a little nearer to the root of 

 the caudal than to the end of the snout ; origin of the anal fin immediately behind the 

 end of the dorsal. Maxillary edentulous, extending to the angle of the prseoperculum. 

 Rio Bavano. 



