68 PEECESOCES. 



Specimens in the British Museum, measuring up to 250 mm. in total length, from 

 the Rio Presidio in Sinaloa, the Kio Mascota in Jalisco [Buller), and Vera Cruz 

 {Meek) appear to belong to the same species as others from Cuba, Jamaica, Barbados, 

 and Trinidad. 



2. Agonostomus nasutus. (Tab. X. fig. 4.) 



Agonostoma nasutmn, Giiutli. Cat. Fisli. iii. p. 4G3 (18G1) ' ; and Trans. Zool. Soc. vi. 1868, 



p. 444, t. 70. fig. 2=. 

 Neomvgil diyueti, Vaill. Bull. Soc. Plnlom. iv. 1894, p. 73'. 

 Ayonostomus nasutus, Jord. & Evcrm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 820 ^ 



Depth of body 34- to 41 in the k^agth, length of head 4 to 4J-. Snout from as long to Ij as long as e)'c, the 

 diameter of -which is 4 to o^ in tlu,' length of head ; interorhital width 2'i to 2-'t in the length of head. 

 Snout verticall}' truncated, the upper lip thick anteriorly, its depth ;| the length of snout ; mouth 

 subterminal; maxillary extending to helow anterior edge or anterior -]- of eye; lower jaw broadly 

 rounded, its length 2i (adult) or 2| (young) in the length of iiead ; length of groove between lower lip 

 and ramus of lower jaw (measured from its anterior extremity to the end of the nraxillary) e(pial to the 

 diameter of eye (adult) or less (young). IS to 20 gill-rakers on the lower part of the anterior arch. 

 41 to 43 scales in a longitudinal series, 12 to 14 in a transverse series from spinous dorsal to in front of 

 vent, 21 or 22 round the caudal peduncle. Eorsal IV, I 8 (exceptionally 7) ; origin of spinous dorsal 

 a little nearer to tip of snout than to base of caudal ; s])ines moderate, the first from less than ^ (adult) 

 to 4 (young) the length of head, shorter than the longest rays of the second dorsal, which has the free 

 edge concave. Anal II 10. Pectoral from less than ^ (adult) to ,1- (young) the length of head, extending 

 to below the spinous dorsal in the young, but not in the adult ; ventrals originating below the middle of 

 the pectorah extending about | of the distance from their base to the origin of anal. Caudal forked. 

 Caudal peduncle lil to 2 as long as deep. Silvery, hack darker ; scales with dark edges ; a blackish s])0t 

 on the base of pectoral ; a more or less distinct silvery latci-al band. 



Hah. Lower California, Mexico, and Central America. 



Specimens in the British Museum from Lower California [Diguet ■^) ; Mexico, 

 Motzorougo {Meek); Guatemala, Fvio San Geronimo {Oiocu^-), E-io Mottigua 

 {Salvin-) ; Costa Eica, Juan Viuas {Tliidenvood). 



Profe>.sor Vaillant has very kindly sent me two specimens of JSfeomugil dirjueti, one 

 of which is now figured (Tab. X. fig. 4). 



?j. Agonostomus salvini. (Tab. XI. fig. 2.) 



Agonostomus salvini, Regan, Ann. Mag. Nat. Ilist. (7) xix. 1907, p. 60 \ 



Depth of body ol to 4| in the length, length of head 4. Snout 1] to 2 as long as eye, the diameter of which 

 is 4| to 04 in the length of head ; interorhital width L'g to 3 in the length of bead. Snout vertically or 

 oblirpiely truncated, the upper \\[> rather tliick anteriorly, its depth t the length of snout; mouth 

 subterminal; maxillary extending to below anterior .| or ante'rior i^ of eye; lower jaw evenh^ rounded, 

 its length 2^ (adult) or 2i (young) in the length of head ; length of groove between lower lip and ramus 

 of lower jaw (measured from its anterior extremity to the end of the maxillary) equal to the diameter of 

 eye (young) or 1^ the diameter of e}e (adult). ]S-1'() gill-rakers on the lower part of the anterior arch. 

 ;j8 to 40 scales in a longitudinal series, IL' or L'i in a transverse scries from spinous dorsal to in front of 

 vent, 21 or 22 round the caudal peduncle. Dorsal IV, 1 S ; origin of spinous dorsal equidistant from tip 

 of snout and base of caudal or a little nearer the former; spines moderate, -? (adult) or -\ (young) of the 



