AGONOSTOMUS. 69 



length of head or of the clistauce between the origins of the dorsal fins and shorter than the longest rays 

 of the second dorsal, which has the free edge a little concave. Anal II 10. Pectoral = the length of 

 head (young) or less (adult), not extending to below the spinous dorsal ; veutrals originating below the 

 middle of pectoral, extending nearly | of the distance from their base to the origin of anal. Caudal 

 moderately notched. Caudal peduncle 2 as long as deep. Silvery or golden, the back olivaceous. 



Huh. Guatemala, Nacasil [Sahin). 



Three specimens, 150 to 270 mm. in total length. 



The species is closely allied to A. nasutus, which has the upper lip thicker, eye a 

 little larger, lower jaw a little shorter, pectorals longer, &c. 



4. Agonostomus percoides. 



Agonostoma percoides (part.), Giintli. Cat. Fish. iii. p, 4G1 (1861). 



This species is represented in the British Museum by the type, from San Domingo, 

 and by two examples from Trinidad. These are the only specimens known. 



5. Agonostomus macracantlius. (Tab. XL fig. 1.) 



Agonostomus macr acanthus, Regan, Ana. Mag. Nat. Hist. (7) xix. 1907, p. 65 '. 



Depth of body 3| to 4 in the length, length of head 3'; to 3§. Snout 1] to 1| as long as eye, the diameter of 

 which is 4| to 5-| in the length of head; intororbital width 2.j in the length of head. Snout verticall}' 

 truncated, the upper lip thick anteriorly ; mouth subtermioal ; maxillary extending to below middle of 

 eye, or nearly. 20 gill-rakers on the lower part of anterior arch. 41 to 43 scales in a longitudinal 

 series, 14 in a transverse series from spinous dorsal to in front of vent, 2(J or 21 round the caudal 

 peduncle. Dorsal IV, I 8 ; origin of spinous dorsal a little nearer to tip of snont than to base of caudal ; 

 spines strong, the first g to |- the length of head or j to | the distance between the origins of the dorsal 

 fins and as long as the longest rays of the second dorsal, which has the free edge concave. Anal II 10. 

 Pectoral -| the length of head, extending to the vertical from the origin of the spinous dorsal or a little 

 beyond ; ventrals originating below the middle of the pectorals, extending i; or -A of the distance from 

 their base to the origin of anal. Caudal forked. Caudal peduncle 1t| as long as deep. Silvery; back 

 darker ; scales with dark edges ; a more or less distinct dark lateral band ending in a dark spot at the 

 base of caudal and with a silvery band above it ; dorsal and caudal fins a little dusky. 



Hah. Guatemala, Rio Guacalate [Salvin i). 



Two specimens, 145 and 210 mm. in total length. 



These were referred by Giinther to A. microps, a species which differs in many 

 respects, notably in the shorter paired fins and lower spinous dorsal. 



6. Agonostomus microps. 



Agonostoma micro'ps, Giiuth. Cat. Fish. iii. p. 4G.2 (1861), and Trans. Zool. Soc. vi. 1SG9, t. 70. 



fig. 1. 

 Agonostoma percoides (part.), Giinth. Cat. Fish. iii. p. 464. 



This species has erroneously been referred to the Central-American fauna ; it is 

 represented in the British Museum by a number of specimens from St. Vincent, 

 Dominica, and Venezuela, and is not known to occur elsewhere. 



