332 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



Genus CHROMIS Cuvier, 1815 



Body oblong or ovate, the depth about half or less than half the 

 length; mouth small, oblique; teeth conical, fixed, each jaw with an 

 outer somewhat enlarged series, followed anteriorly by a narrow band, 

 sometimes by two or more irregular series, discontinued laterally ; sub- 

 orbital adnate to cheek (sometimes slightly free anteriorly) ; preopercie 

 entire; gill rakers slender, rather numerous (about 18 to 24 on lower 

 limb of first arch in Peruvian species); scales large, about 24 to 33 

 vertical series along middle of side; scales reduced in size on upper 

 surface of head, extending nearly to rim of mouth; dorsal with about 

 12 to 14 spines, and about an equal number of soft rays; caudal usually 

 rather deeply forked. 



KEY TO THE SPECIES 



a. Body elongate, depth 2.6 to 3.4 in length; 30 to 32 vertical series of scales 

 along middle of side; anal with 10 or 11 soft rays; caudal fin with a con- 

 spicuous dark stripe on each lobe, rest of fin light atrilobatus (p. 332) 



aa. Body deeper, depth 1.8 to 2.2 in length; 26 to 29 vertical series of scales along 



middle of side; anal with 12 to 15 (rarely 11) soft rays; caudal fin nearly 



uniform in color. 



b. Head large, 2.75 to 3.2 in length; dorsal with 13 (rarely 14) spines, posterior 



ones shorter than some of more anterior ones; margin of anal broadly 



rounded crusma (p. 334) 



bb. Head smaller, 3.2 to 3.9 in length; dorsal with 12 spines, those following the 

 third of about uniform length; margin of anal forming an acute angle. 



intercrusma (p. 335) 



CHROMIS ATRILOBATUS Gill 



Chromis (Furcaria) atrilobata Gill, 1862, p. 149, Cape San Lucas, Baja California 

 (original description, compared with C. pundaius (Poey)). 



Chromis atrilobatus Evermann and Radcliffe, 1917, p. 117, Lobos de Afuera, 

 Peru (synonymy; description; range). — Meek and Hildebrand, 1925, 

 p. 696, pi. 69, fig. 2, Panama Bay (synonymy; diagnosis; compared with C 

 marginatus (Castelnau) of the Atlantic coast). 



Head3.2to3.6;depth2.65to3.4;D.XII, 12or 13;A. II, 10 or 11; 

 P. 17 or 18; scales 30 to 32 vertical series along middle of side. 



Body elongate, rather strongly compressed, its greatest thickness 

 about 2.5 in its depth; back moderately elevated; dorsal outline 

 scarcely more convex than the ventral; caudal peduncle moderately 

 long, quite compressed, 2.2 to 2.7 in head; snout somewhat pointed, 

 3.2 to 5.2; eye 2.9 to 3.6; interorbital 3.55 to 5.0; mouth moderately 

 small, oblique, terminal ; maxillary reaching somewhat beyond vertical 

 from anterior margin of eye, 2.75 to 3.5 in head; each jaw with an 

 enlarged outer series of conical teeth, followed anteriorly by a very 

 narrow band of smaller, pointed teeth; gill membranes separate; gill 

 rakers slender, about half length of eye, 18 or 19 on lower and about 8 

 on upper limb of first arch; margin of preopercie irregular, not def- 

 initely serrate; suborbital slightly free from cheek anteriorly; lateral 



