296 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



mentioned first in each instance pertain to the type. These specimens 

 differ from those of 0. typicus Gill, 0. sciurus (Jordan and Gilbert), 

 and 0. imiceps (Jordan and Gilbert), related species from Panama 

 Bay, in having longer gill rakers, deeper scales, in having only 7 

 instead of 8 soft rays in the anal, and in being notably darker in 

 color. In shape and form they resemble 0. typicus, differing further, 

 however, in having a more compressed head, a less strongly projecting 

 snout, and 25 or 26 rays in the second dorsal, mstead of only 22 or 23 

 as in 0. typicus. The Peruvian specimens differ from 0. sciurus in 

 having 6 or 7 rows of scales between the lateral line and first dorsal 

 spine, instead of only 5, and they also have 4 rows above and 5 below 

 the lateral line (exclusive of the median series) on caudal peduncle, 

 whereas sciurus has only 3 and 4, respectively; and the pectoral fin 

 is shorter, failing to reach tip of ventral, whereas it reaches well 

 beyond tip of ventral in sciurus. The Peruvian specimens perhaps 

 are nearest those of 0. imiceps, from which they differ, however, in 

 addition to the characters already mentioned, in having a more 

 strongly projecting snout, shorter pectoral, and in having smaller 

 and more numerous serrae (about 11 or 12, instead of 7) on the 

 preopercular margin. 



The name obscurus is given in allusion to the dark color. 



Range. — Known only from the type material from Lobos de Tierra 

 Bay. 



Genus LARIMUS Cuvier and Valenciennes, 1830 



Body only moderately elongate, compressed; back elevated; head 

 rather short, compressed; snout short; mouth large, strongly oblique 

 to vertical; lower jaw projecting; preopercular margin without bony 

 teeth; gill rakers long and slender about 15 to 25 on lower limb of 

 first arch; skull without conspicuous caverns; second dorsal long, 

 with about 20 to 30 soft rays; anal short, usually with only about 

 6 or 7 soft rays. 



Two species are represented in the Peruvian collections now at 

 hand. The eye in these species is rather odd in shape, as its longest 

 diameter extends downward and slightly backward. 



KEY TO THE SPECIES 



a. Mouth nearly vertical; maxillary extending about to vertical from front 

 of pupil; pectoral longer than head, 2.8 to 3.1 in length, with 15 or 16 



rays eflfulgens (p. 296) 



aa. Mouth only moderately oblique; maxillary extending fully to vertical from 

 posterior margin of pupil; pectoral shorter than head, 3.6 in length, with 

 18 raj^s gulosus, new species (p. 298) 



LARIMUS EFFULGENS GUbert 



Larimus effulgens Gilbert, in Jordan and Evermann, 1898, p. 1421, Panama 

 Bay (original description). — Gilbert and Starks, 1904, p. 123, pi. 16, 

 fig. 33, Panama Bay (description; compared with L. argenteus and 



