DESCRIPTION OF A NEW SPECIES OF PIPE-FISH 

 (SIPHOSTOMA SINALO.E) FROM MAZATLAN. 



BY DAVID STARR JORDAN AND EDWIN CHAPIN STARKS. 



Siphostoma sinaloae Jordan & Starks, n. sp. 



Allied to Sifhostoma arctuni Jenkins & Evermann. 



Head 8^2 in length to base of caudal; depth 3^2 in 

 head; dorsal 26, on 1*^+5 rings 14-J-35. 



Snout 1% in head, a strong median ridge above run- 

 ning to between middle of eyes, a ridge on each side 

 from angle of mouth to below eye, occipital and nuchal 

 plates keeled, a slight keel on anterior part of opercle: 

 dorsal keels ceasing in front of the last four or five rays 

 of dorsal, the lateral ridge running up and continuing as 

 dorsal ridges; belly with a keel on each side. Preanal 

 part of belly 1% in postanal part; pectoral shorter than 

 eye; caudal 3 in head. 



Color olive brown above, abruptly lighter below lateral 

 ridges anteriorly, the edges of the plates dark, forming 

 reticulations on lower parts of body, between every four 

 rings is a narrow white cross-bar; from each eye is a 

 narrow light bar running upward and backward to occi- 

 put; caudal dark. 



The two type specimens, one of which was sent to the 

 British Museum, were collected by the Hopkins Expe- 

 dition at Mazatlan. They were erroneously referred to 

 Siphostoma arctum in our paper on the Fishes of Sina- 

 loa, Proc. Cal. Acad. Sci., 1895, 416. 



Type No. 2945, L. S. Jr. Univ. Museum. 



Proc. Cal. Acad. Sci., 2d Ser., Vol. VI. June 27, 1896. 



