398 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



specimens are included in the collection made by the Mission, by R. 

 E. Coker, and by others. The proportions used in the description 

 are based on 16 specimens, 53 to 310 mm. (45 to 260 mm. to base of 

 caudal) long, and the enumerations are founded on 25 examples. The 

 specimens studied were collected in Lobos de Tierra Bay, Lobos de 

 Afuera Bay, Chimbote Bay, at Callao, North Chincha Island, 

 "Chincha Islands," Point Ripio, La Lagunilla, Pisco, and in Inde- 

 pendencia Bay. 



This species differs from the other local forms in having smaller 

 scales, which are especially small above the lateral line on the ante- 

 rior part of back, and in having more rays in the pectoral fin, 15 

 being present in 44 specimens examined and 16 in three others. The 

 difference in the shape of the head, which the species undergoes with 

 age and growth, as indicated in the description, is remarkable. A 

 large size, for a blenny, as already indicated, is attained. 



Range. — Coast of Peru; also listed from Coquimbo, Chile, by 

 Delfin (1901, p. 94). 



LABRISOMUS XANTI Gill 



Trambollo 

 Lahrosomus xanti GxLh, 1860, p. 107, "Cerro Blanco," Mexico (original description). 

 Lepisoma xanti Evermann and Radcliffe, 1917, p. 143, Lobos de Afuera, Peru 



(description). — Nichols and Murphy, 1922, p. 513, South Guanape Island 



and South Chincha Island, Peru. 

 Labrisomus xanti Meek and Hildebrand, 1928, p. 937, pi. 94, fig. 2, Panama Bay 



(synonymy; description; compared with L. nvchipinnis; range). 



Head 2.8 to 3.4; depth 3.6 to 5.1; D. XVIII, 13 (occasionally 12); 

 A. II, 18 or 19; P. 14; scales in lateral line (pores) 63 to 68, just above 

 lateral line 65 to 73; vertebrae 32 (one specimen dissected). 



Body elongate, moderately compressed, its greatest thickness about 

 two-thirds its depth; dorsal outline of head ascending rather rapidly 

 in front of eyes, gently convex from interorbital to dorsal fin; head 

 fairly large, rather broader than anterior part of trunk; caudal pedun- 

 cle short, compressed, 3.4 to 4.1 in head; snout somewhat pointed, 

 2.9 to 3.8; eye 3.1 to 5.3; interorbital 10.8 to 14; mouth large, almost 

 horizontal, terminal, or lower jaw projecting slightly; maxillary reach- 

 ing to or beyond middle of eye, 2.0 to 2.5 in head; teeth in each jaw 

 in an outer series, consisting of enlarged teeth, somewhat compressed 

 at base and curved, followed anteriorly by a band of minute teeth; 

 those on vomer in a single series, rather stout conical, the anterior 

 (median) one enlarged; those on palatines rather smaller, generally in 

 2 or 3 irregular series; anterior nostril with a tuft of 6 to 8 tentacles, 

 about as long as pupil; upper posterior part of eye with a tuft of about 

 8 to 16 tentacles, fully half length of eye; nuchal "comb" consisting 

 of about 16 to 24 tentacles on each side, about half length of eye; gill 

 rakers scarcely as long as pupil, about 7 on lower and about 3 on upper 

 limb of first arch; lateral line curved anteriorly, reaching middle of side 



