790 PROCEEDINGS OF THE NATIONAL MUSEUM. 



which grow narrower on sides of jaws; the outer row of teeth a little 

 enlarged; no teeth on vomer or palatines. Interorbital space evenly 

 curved from eyesand ini])rokon by ridges. Vertical, liml) of preopercle 

 concave; the edges with small weak spines partly hidden }ty the skin, 

 and not enlarged at the angle. The longest gill rakers nearl}^ half as 

 long as eye; 22 or 23 of them on the anterior lind) of arch. 



Scales ctenoid; snout, mandible, maxillary, and the greater part of 

 preorbital naked. Dorsal and anal naked; a xevy slight scaly sheath 

 at the base of each; that of antd a little the better developed. Ven- 

 trals, pectorals, and caudal with a few scales on base; tine scales run- 

 ning nearly to the tips of caudal rays. 



Pectoral IfV to 1\ in the length of head; reaching to a point midvvaj^ 

 between tips of ventrals and front of anal. Third and fourth dorsal 

 spines ecjual and the highest; their length 2^ to 2f in head; behind 

 these the spines gradually and uniformly decrease in length to the soft 

 dorsal. Base of soft dorsal from If to 2 in head. The anterior or 

 longest ravs of soft dorsal equal in length to those of anal and a little 

 greater than the diameter of eye. The anal ends slightly in front of 

 the soft dorsal. Ventrals reaching halfway from their base to front 

 of anal. Caudal forked; the upper lobe a little longer than lower. 



Color greenish gray on ))ack; sides and ))elly silvery, overlaid with 

 dusky shades. The scales on sides have a darker border, and faint 

 traces of longitudinal streaks follow the rows of scales. Base of pec- 

 toral with a dark spot a))Ove on l)oth sides of tin; axil dusky; inner 

 surface of lin usuall}' darker than outer surface. Ventrals dark, and 

 growing darker toward their tips. Dorsals dusk}'; the spinous dorsal 

 sometimes ])Iack; the rays of soft dorsal and anal similar, growing 

 darker toward tips. 



This species difl'ers from Is<(cla conception i^ in having a larger eye, 

 a longer head, the lower jaw a little thinner at the tip and slightlj" • 

 less projecting, and the vertical limb of the preopercle more concave. 

 The color is everywhere lighter in the specimens at hand, though the 

 markings arc the same. 



In the description given by Ab])ott (quoted above) the measurement 

 given for the length of the iiead is incorrect. It is 2i''o in entire 

 length to l)ase of caudal in his smaller specimen and ;>i\, in his larger 

 one. Cuvier and Valenciennes sa}" that the length of the head of hacla 

 conceptionix is less than the depth. It is constantly greater than the 

 depth in hachi vcnnsia^ and slighth" less, or ecpial to the depth in our 

 specimens of the former species. 



Four specimens collected at Callao, Peru. Besides these there are in ■j 

 the Stanford University collections two specimens from the same locality 

 collect(Kl by Admiral Beardslee. The specimens range from 17.") to 

 250 mm. in l(>ngth. A specimen 220 nun., collected by Mr. Simons, 

 is selected as the type. It is Cat. No. W.\\(\1^ in the U. S. National ~ 

 Museum. Other specimens are in Stanford University museum. 



