102 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



more than halfway to origm of anal, generally mserted rather nearer 

 base of pectoral than origin of anal; pectoral rather large, sometimes 

 reaching base of ventral, sometimes falling short of this point by 

 diameter of pupil, 1.65 to 2.0 in head, 5.6 to 6.3 in length; axillary 

 scale of pectoral about two-thirds length of fin, 3.0 to 3.3 in head. 



Color of preserved specimens pale; side of head and lower half of 

 body more or less silvery; side with a silvery band about as wide as 

 eye sometimes missing or dark in specimens preserved in formalin; 

 back with dusky points, not dense enough to form a dark band; 

 caudal and dorsal with dusky points, other fins pale ; the smaller spec- 

 imens with dark dots along base of anal, and extending on caudal 

 peduncle. 



This species is represented in the collection made by the Mission in 

 1941 by 30 specimens, 48 to 135 mm. long, which formed the basis 

 for the first record of this species from Peru (Hildebrand, 1943a, p. 

 100), as well as for the foregoing description. The specimens were 



Figure 21. — Anchoa naso (Gilbert and Pierson). From a specimen 70 mm. long, Taboga 

 Island, Panama (U.S.N.M. No. 79570). (After Hildebrand, 1943.) 



collected in the Gulf of Guayaquil, off Puerto Pizarro; Cabo Blanco; 

 Lobos de Tierra; Santa Island, near Chimbote; and in Sechura Bay. 

 The specimens, in part, were removed from the stomach of a shark 

 and a large scombroid fish. 



Peruvian specimens of this species have rather more numerous 

 anal rays and gill rakers than those from farther north, which makes 

 it difficult to distinguish this species from A. nasus on the basis of 

 these enumerations. However, the head is rather longer in A. naso, 

 its length in standard length averaging 3.25 in 14 specimens, whereas 

 in 13 specimens of nasus the average is 3.43. The anal base is some- 

 what longer, averaging 4.09 in the standard length in naso in the same 

 group of specimens, and 4.36 in nasus. The species are readily 

 recognizable if specimens of equal size are compared. For example, 

 in species about 70 mm. long the snout in naso is much longer and more 

 piglike, being fully as long as the eye, whereas, in nasus it is only 

 about three-fourths as long as the eye; the cheek is much longer and 

 narrower in naso, being about as long as the eye and half the snout, 



