328 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



torals brown within, the outer side silvery with yellow tinge. Ven- 

 trals yellow ou inner margins, silvery on the outer. Eoof of mouth 

 and tongue bright white. 



This species occasionally appears in large numbers in the market of 

 Panama, where several specimens were obtained. 



The type of the present description (No. 2931)5) is 16 inches in length. 



The species of Pimelepterus known from the Pacific Coast of tropical 

 America may be thus distinguished : 



a. Incisor teeth well developed, eacli with a conspicuous horizontal process or root ; 

 caudal fin moderate, about as long as head, the outer rays not 3 times length 

 of middle rays; junction of gill-membranes forming an angle. 



b. Body broad-ovate, the depth 2 to 2^ in length; profile of snout concave; inter- 

 ocular space gibbous ; fins low, the longest dorsal spines less than half head; 

 scales not small, about 10-57-17. Color dusky, with light and dark stripes 

 along the rows of scales; fins mostly dark Analogus.* 



bi. Body obloug-elliptical, the depth 2J in length ; profile of snout not concave, 

 the iuterocular space little gibbous ; lins rather high, the longest dors.al spine 

 half head; scales rather small, 12-67-22. Color chiefly yellow, not distinctly 



striped; fins pale LuTESCENS.t 



aa. Incisor teeth small, with inconspicuous roots ; caudal much longer than head, the 

 lobes falcate, the outer 5 times length of middle rays; gill-membraucs not 

 forming an angle at junction; form rather slender, the depth 2|- in length; 

 profile of snout scarcely concave; iuterocular sjjace little gibbous; fins low, 

 the highest dorsal spine less than one-third head ; scales small, 10-78-18. 

 Color olivaceous, with blue and golden spots and stripes; fins mostly yellow. 



OCYURUS. 



15. Gerres aureolus, sp. nov. (29487.) 



Body ovate, much compressed, the back elevated, the outlines nearly 

 regular ; outline along base of anal very oblique ; caudal peduncle very 

 short and deep, tapering regularly to base of tail; snout rather pointed, 

 projecting, the interorbital area strongly depressed. Maxillary long, 

 reaching to a point midway between front and middle of pupil, the ex- 

 posed ])ortion narrowly oblong, its width about two-fifths its length; 

 teeth slender, in narrow bands; groove on top of head for premaxillaries, 

 scaleless, triangular, reaching a point opposite middle of eye, its width in 

 front two-thirds its length. Eye very large, its diameter greater than 

 snout or than interorbital width, 3J in head. Preopercle with the angle 

 produced, the margin sharply and finely serrated. Gillrakers very 

 short, not one-third diameter of pupil. Scales moderate, in about 4 rows 

 on the cheek ; lateral line running high, but little arched, much above 

 axis of body even on caudal peduncle. 



Dorsal spines slender, but little tiexible, the second scarcely stronger 

 than the others, about as long as the third, half as long as the head. 

 Dorsal fins separate, notched to the base, the upper outline of spinous 



* Pimelepterus analogus GiW, Proc. Ac. Nat. Sci. Phila. 1862, 245: Pimelepterus elegans 

 Peters, Bcvliner Monatsber. 1869, 707. Cajie San Lucas {Gill,); Mazatlan {Peters, 

 Gill).)] Porto Escoudido (Mc/;o7s co//.); Chiapam (G^/(r.) ; Panama (GfAr. Gilh.). 



] Pimelepterus lutescens Jordan & Gilbert, Proc. U. S. Nat. Mus. iv, 1881, 239. Socorro 

 Island {Nichols coll.). 



