AGONOSTOMUS. 69 
length of head or of the distance 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; ventrals originating below the 
middle of pectoral, extending nearly 3 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. 
Hab. Guatemaua, Nacasil (Salvin). 
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.), Giinth. Cat. Fish. ii. p. 464 (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 macracanthus. (Tab. XI. fig. 1.) 
Agonostomus macracanthus, Regan, Ann. Mag. Nat. Hist. (7) xix. 1907, p. 65°. 
Depth of body 32 to 4 in the length, length of head 33 to 33. Snout 13 to 15 as long as eye, the diameter of 
which is 42 to 52 in the length of head; interorbital width 2% in the length of head. Snout vertically 
truncated, ‘the upper lip thick anteriorly; mouth subterminal; maxillary extending to below middle of 
eye, Or nearly. 20 gill-rakers on the lower part of anterior arch. 41 to 43 scales ina longitudinal 
series, 14 ‘in a transverse series from spinous dorsal to in front of vent, 20 or 21 round the caudal 
peduncle. Dorsal IV, I 8; origin of spinous dorsal a little nearer to tip of snout than to base of caudal ; 
spines strong, the first 3 to 2 the length of head or } to 7 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 IT 10. 
Pectoral 2 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 3 or 3 of the distance from 
their base to the origin of anal. Caudal forked. Caudal peduncle 13 as long as 5 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. 
Hab. Guatemata, Rio Guacalate (Salvin '). 
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 microps, Giinth. Cat. Fish. i. p. 462 (1861), and Trans. Zool. Soe. vi. 1869, t. 70. 
fig. 1. . 
Agonostoma percoides (part.), Giinth. Cat. Fish. ii. 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. 
