Fishes from Tobago. 535 
Centrochromis rudis. 
Glyphidodon rudis, Poey, Memorias, ii. p. 191 (1860); Giinther, Cat. 
Fish. iv. p. 87 (1862). 
Abudefduf rudis, Jordan and Evermann, Bull. U.S. Nat. Mus. xlvii. 
p. 1563 (1898). 
Depth of body 1? to 2 in length, length of head 32 to 34. 
Snout slightly longer than diameter of eye, which is 83-33 
in length of head and 14 to 14 in interorbital width. Snout 
and lower jaw naked. Maxillary extending to vertical from 
nostril. ‘Teeth in a single series, equal, all deeply bifid. 
Preeoperculum coarsely serrated; operculum with a flat 
spine. Dorsal XIII 12; fourth to sixth spines longest, 
2 to 4 length of head, shorter than longest soft rays; soft 
fin obtusely angular. Anal II 10; second spine strong, 
nearly 4 length of head. Pectoral nearly as long as head. 
Pelvics scarcely reaching vent. Caudal emarginate, with 
rounded lobes. Caudal peduncle twice as deep as long. 
25-27 scales in a longitudinal series, 34 from origin of 
dorsal to lateral line. Five broad dark vertical bands on 
body, wider than the imterspaces ; a black spot superiorly in 
axil of pectoral. 
Five specimens, 115-180 mm. in total length. 
Microspathodon chrysurus, Cuv. & Val. 
Depth of body 2 in the length, length of head 31 to 83. 
Snout longer than diameter of eye, which is 3 to 4 in length of 
head. Interorbital space convex, its width 1} times diameter 
of eye. Preeorbital broad, deeply notched, its depth above 
angle of mouth 1 to 1} times diameter of eye. Lower jaw 
slightiy shorter than upper; maxillary extending to vertical 
from nostril. Teeth m both jaws flat, sharp, movable, in a 
single series ; in the lower jaw twice as large as in the upper. 
Head entirely scaly, except the lower jaw. Dorsal XII 15-16; 
spines gradually increasing from the first, last 4 length of 
head; soft finangular. Anal II 138-14; second spine about 4 
length of head. Pectoral as long as, or slightly longer than, 
head. Pelvics reaching vent or slightly beyond, but not 
to anal. Caudal forked; upper lobe longer than lower. 
Caudal peduncle nearly twice as deep as long. 29 scales 
in a longitudinal series, 33 from origin of dorsal to lateral 
line. Brownish; scales on body with darker edges ; some 
white spots scattered on head and nape, and to a lesser 
extent on back and scales of dorsal fin. Dorsal, anal and 
pelvic fius dusky; caudal yellow. 
Two specimens, 147 and 135 mm. in total length. 
