PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 335 



DESCKIPTSOIV OF A NEW .SPECIES OF lEEmiBHAITIPIIUS (HEITII. 

 REtA.^lPIIdS KOS^TI), FKOIT5 THE COAST OF CAI.IFORIVIA. 



By DATID S. JORDAN and CHARL.ES H. OIL.B£RT. 



Heniirhamphus rosse. isp. nov. * 



Allied to Hemirhamphvs miifasciatus and otlier typical species of the 

 genus. 



Body rather elongate, moderately compressed; the greatest depth 

 being one-ninth of the length from the snout to the base of the caudal. 

 Length of the whole head, including the lower jaw, contained 2| times 

 in the length from tip of lower jaw to base of caudal. Length of the 

 lower jaw beyond the tip of the upper jaw 4 J times in the same length. 

 The length of the head from the tip of the upi^er jaw is contained 3| 

 times in the trunk (without head or caudal). 



The triangular part of the premaxillaries is convex, slightly carinated 

 above, and about as broad as long. The eye is rather large, somewhat 

 less than the interorbital space, and about half of the postorbital part 

 of the head. Mandible elongate, the narrowed tip slightly bent down- 

 ward; the bone bordered on each side for its entire length by a con- 

 spicuous membrane, the membranaceous part being about as wide as the 

 bony portion itself. Upper surface of mandible convex, grooved. Teeth 

 in both jaws small, even, all of them apparently unicuspid. Top of head 

 nearly plane, very slightly convex. Preorbital rather long; its diameter 

 two-thirds that of the eye. 



Scales rather small, very deciduous, about 03 in a longitudinal series. 



Fin rays: D. I, 13; A. I, 14. 



Dorsal and anal fins not at all scaly ; the dorsal a very little longer 

 than the anal and inserted slightly in front of it; the anterior rays of 

 dorsal and anal moderately elevated. Caudal fin moderately forked; 

 the lower lobe the longer; the middle rays nearly twice the diametef of 

 the eye. Pectoral fin a little longer than the i^ostorbital part of the 

 head. Insertion of ventral fin slightly. nearer the tip of the caudal fin 

 above than the eye, and midway between the gill-opening and the base 

 of the caudal. Ventrals a little shorter than the postorbital part of the 

 head, not reaching vent. 



