242 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



included; maxillary reaching front of pupil, 2.6 in head; teeth not 

 evident; premaxillary groove broad, free from scales; preorbital very 

 narrow, with an indentation under anterior part of eye, distinctly 

 serrate in front of and behind indentation; preopercle serrate; gill 

 rakers quite short, 13 on lower limb and about 8 on upper limb of 

 first arch; scales large, with irregular membranous margins, forming 

 a broad sheath on bases of dorsal and anal, extending on caudal, 

 ventral, and slightly on pectoral; dorsal spines strong, the second 

 enlarged, a little longer than the third, 1.6 in head; second spine of 

 anal very strong, not reaching tip of third, 1.9 in head; ventral in- 

 serted slightly behind pectoral, failing to reach anal by about half 

 diameter of eye, with a strong spine contained 2.1 in head; pectoral 

 long falcate, extending a little beyond tip of ventral, almost as along 

 as head, 3.3 in length. 



Figure 52. — Diafterus periche (Evermann and RadclifFe). From the type, Tumbes, Peru 

 (U.S.N.M. No. 77743). (After Gnres periche Evermann and Radcllffe, 1917.) 



Color, as described by Evermann and RadclifFe (see reference 

 above), "Silvery, tinged with yellow, a black line along each row of 

 scales above base of pectoral, about 9 of these black lines; no black 

 area in axil of pectoral." The color of tbe specimen remains about 

 as described after many years' emersion in alcohol. 



The description is based on the type (U.S.N.M. No. 77743), the 

 only specimen known, which is about 255 mm. (198 mm. to base of 

 caudal) long and was taken at Tumbes by R. E. Coker. This species, 

 as represented by the type, differs from D. peruvianus in having a 

 serrated preorbital. 



Range. — Known only from Tumbes, Peru. 



Family POMADASIDAE: Grunts 



Body more or less elongate; the back generally elevated; head large, 

 blunt or rather pointed; mouth large or small, more or less horizontal, 

 low, usually terminal; premaxillaries protractile; maxillary without a 



