PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 431 



Supraorbital bones witli radiating strife. Distance between nostrils a 

 little more than one-sixth length of snout. 



Jaws comparatively short, strong, tapering; very stifif; lower jaw 

 wider and longer than upper. Both jaws with broad bands of small 

 teeth on the sides ; within these is a series of very large knife-shaped 

 teetb. The length of the longest teeth is a little more than 3 times the 

 breadth. 



Posterior teeth in both jaws directed backward; anterior teeth erect. 

 25-1-25 

 Number of large teeth about J3j:|3; length of large teeth about one- 

 fifth diameter of eye; no vomerine teeth. 



Upper jaw from eye about If times as long as the rest of head. Eye 

 large, 7 in snout, 2| in post orbital part of head, and 1| in interorbital 

 width. Maxillary entirely covered by the preorbital. Cheeks densely 

 scaled; opercles scaled only along the anterior margin. Scales minute, 

 especially on the back ; somewhat larger below. 



Dorsal fin rather high in front, becoming low posteriorly, the height 

 of its anterior lobe equaling post orbital part of head; its longest ray 

 is two-fifths of the length of the base of the fin. Caudal lunate, its lower 

 lobe nearly one-half longer than the upper; middle rays about as long 

 as eye. Anal falcate, low posteriorly, its anterior lobe equal to anterior 

 dorsal lobe. 



Ventrals inserted midway between base of caudal and middle of eye, 

 their length a little less than that of pectoral, and equal to postorbital 

 part of head. 



' Upper ruy of pectorals broad, sharp-edged ; length of pectorals 3f in 

 head, and slightly greater than postorbital part of head. 



Head 3^ in length to base of caudal; depth nearly 4 in head, about 

 13 in total to caudal base. 



D.I, 22; A. I, 20; V. 6; P. 14. 



Color dark green above, silvery below ; dorsal and pectoral blackish ; 

 ventrals somewhat dusky; anal yellowish, the lobe slightly soiled; 

 caudal dusky olivaceous. No suborbital bar and no scapular spot. A 

 slight dusky shade on upper posterior part of cheeks, and a yellowish 

 bar on anterior edge of opercle. Caudal keel black. 



This species is closely allied to T.fodiator Jor. «& Gilb., described from 

 Mazatlan, differing from it chiefly in its longer jaws and greater number 

 of fin-rays. 



Chriodorus, new genus, ScombresocidvE. 



Body moderately elongate and compressed, covered with large smooth 

 scales. Lateral line extending along the lower side of the belly. Jaws 

 short, equal, not produced. Teeth large, incisor-like, tricuspidate, close 

 set, in two distinct series in each jaw, those of the inner series some- 

 what smaller than the outer. No teeth on vomer or palate. Premaxil- 

 lary not protractile, slightly movable. Maxillary anchylosed with the 



