120 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.9 



USNM 101635: 2 specimens, 37.5-45.1 mm, Port Utria, Colombia, 

 January 23, 1935, under electric light from Velero III at anchor, W. L. 

 Schmitt, collector; — 101636: 1 specimen, 52 mm, same data as 101635. 



CAS 2549-2553, 3787, 5270-5273, 5319-5329: 21 specimens, Braith- 

 waite Bay, Socorro Island, March 6, 1932, under electric light, Zaca; — 

 5275-5279: 5 specimens, Braxilito Bay, Costa Rica, July 1, 1932, under 

 electric light, Zaca; — 2554-2560: 7 specimens, Cape San Lucas, Baja 

 California, August 6, 1932, seine haul, Zaca ;— 1235-1236, 1339-1344, 

 1346-1359, 2005: 23 specimens. Clarion Island (no other data; 1932?) ; 

 — 1717-1721: 6 specimens and 1 without number, Socorro Island (no 

 other data; 1932?); — (no numbers): 3 specimens, Socorro Island, 

 March 17, 1932, under light at night; — (no numbers): 9 specimens, 

 Braxilito Bay, Costa Rica, July 1, 1932, Zaca; — (no numbers) : 4 speci- 

 mens, ofif Bat Island, Costa Rica, July 2, 1932, under electric light; — 

 (no numbers) : 2 specimens, Maria Madre Island, Tres Marias Islands, 

 Mexico, July 31, 1932, Zaca. A number of these specimens in the Acad- 

 emy are not in good condition. 



Range. — From Lower California and the Revillagigedo Islands, 

 Mexico, to Port Utria, Choco, Colombia. 



Description. — Body elongate, compressed, depth 3.46-4.5 in standard 

 length. Dorsal outline of body either moderately and evenly curved from 

 tip of snout to caudal base or much flattened before the first dorsal. Ven- 

 tral outline equally or only slightly more curved in specimens which have 

 an evenly curved dorsal outline, and much more deeply curved in those 

 specimens in which the predorsal outline is much flattened. Abdomen 

 compressed, but not sharply so. Preventral edge thinly rounded, not 

 keeled. Caudal peduncle length 4.7-6.3 in standard length; caudal pe- 

 duncle depth 2.1-2.6 in its length. 



Sides of head and body scaled; 38-41 scales in a lateral series from 

 above gill-opening to caudal base. Predorsal scales along mid-line of back 

 13-16. Scales around caudal peduncle 12. Preventral scales 9-11. Base of 

 caudal fin scaled. Anal sheath greatly reduced ; a short, single row of 3-8 

 small, modified scales along the base of the anterior anal rays. Other fins 

 naked. One complete row of scales included in the lateral line below the 

 first dorsal and half a row both above and below. Lateral line of several 

 irregular and incomplete series of pores along the sides. 



Head short and deep, rather abruptly truncate posteriorly, its length 

 3.67-4.5 in standard length; head width 1.18-1.96 in its length. Snout 

 short, bluntly rounded from both dorsal and lateral aspects, 3.04-3.86 in 



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