236 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



ctenoid, the rows above lateral line not parallel with it, but running 

 obliquely upward and backward, about 9 or 10 rows between lateral 

 line and base of fii'st dorsal spine and 7 or 8 between lateral line and 

 first soft ray of dorsal; dorsal fin deeply notched, but continuous, the 

 third and fom-th spines generally longest, 2.5 to 3.2 in head; caudal 

 somewhat forked, the lobes pointed; anal with only 2 well-developed 

 spines, the third scarcely differentiated from the soft rays, not di- 

 vided, though not pungent (a condition presimiably pertaining be- 

 cause of extreme youth), origin of fin almost directly opposite that 

 of soft dorsal, second anal spine 6.0 to 7.0 in head; ventral inserted 

 very slightly behind base of pectoral, with a rather slender spine, 3.2 

 to 3.5 in head; pectoral pointed, reaching a little beyond tip of ventral, 

 4.1 to 5.0 m length, 1.4 to 1.75 in head. 



Figure 51. — Xenistius feruanus, new species. From the type, 55 mm. long, Lobos de 

 Tierra Island, Peru (A.M.N.H. No. 16202). 



Color brownish, a little lighter above than below; a dark line on 

 middle of caudal peduncle, extending forward about to a point above 

 origin of anal, following lateral line on caudal peduncle, but continuing 

 a straight com-se forward where lateral line bends upward; upper 

 parts of head and body with numerous dusky points, extending on 

 fins. 



The foregoing description is based on 10 specimens, 43 to 55 mm. 

 (34 to 45 mm. to base of caudal) long, from Lobos de Tierra Island, 

 kindly lent for study by J. T. Nichols, of the Americal Museum of 

 Natural History. A specimen 55 mm. (45 mm. to base of caudal) 

 long has been selected as the type (A.M.N.H. No. 16202). The fol- 

 lowing proportions and enumerations are based on the type: Head 

 in length 2.8; depth 3.4; pectoral 5.0. Eye in head 3.4; snout 4.7; 

 interorbital 5.7; maxillary 3.5; caudal peduncle 4.4; longest dorsal 

 spine 3.2; second anal spine 6.0; ventral spine 3.5; pectoral 1.75. 

 D. Xin, 14; A. HI, 13 (or II, 14); P. 17; scales 9-75; gHl rakers 

 11 + 21. 



