4 BULLETIN 95, UNITED STATES NATIONAL MUSEUM. 



Following are the dimensions of these two individuals : 



Female. 



Male. 



Total length 



Tip of snout to origin of first dorsal 



Base of first dorsal 



Posterior base of first dorsal to origin second dorsal 



Base of second dorsal 



Base of second dorsal to origin caudal 



Length of caudal 



Length anterior margin first dorsal 



Length anterior margin second dorsal 



Tip of snout to eye 



Eye..... 



Interorbital 



Tip of snout to first gill-opening 



Tip of snout to nearest point of mouth 



Angle of mouth to center of upper lip 



Length of labial fold of upper hp 



Length of labial fold of lower lip 



Tip of snout to origin pectoral 



Length of pectoral 



Origin of pectoral to origin of ventral 



Length of ventral 



Origin ventral to origin anal 



Length of anal 



Base of anal 



Head broad and depressed; snout blunt, projecting little beyond 

 mouth ; mouth broad, the arch greater in male than in female ; teeth 

 small, with indistinct lateral cusps; nasal valves not confluent, sepa- 

 rated from each other by a considerable interspace, with a downward 

 twist, the outer border broadly rounded, the inner somewhat notched ; 

 no cirrus; each jaw with a labial fold extending from angle of mouth 

 for about one-half its length ; caudal peduncle long and slender. 



Origin of dorsal opposite posterior base of ventrals ; origin of sec- 

 ond dorsal opposite middle of ventrals ; first dorsal somewhat higher 

 in male than female. Some of the granulations along ridge of back 

 on either side of median line somewhat larger than the others; a 

 ridge of enlarged tubercles above eye. 



Color of male in spirits, back bluish black, becoming yellowish 

 on ventral surface; dorsal surface crossed by seven broad rhombic 

 black transverse blotches, first over origin of pectoral, second above 

 tip of pectoral, third under first dorsal, fourth midway between first 

 and second dorsal, fifth under second dorsal, sixth midway between 

 second dorsal and base of caudal, and seventh across base of caudal ; 

 head, back, sides, and fins with large black spots ; an indistinct dark 

 band across head, through eyes ; some lighter yellowish spots on sides. 

 In the female, the interspace between the black crossbands on back is 

 much lighter, of a yellowish tinge, similar to belly. 



