FAMILY XV. MUGILID^;. 187 



Agonostomus monticola Jordan & Evermann, Bull. 47, U. S. Nat. 



Mus., 1896, 819. 



Agonostoma nasutum Gunther, Cat., in, 463, 1861; Rio Geronimo. 

 Agonostomus nasutus Jordan, Proc. Cal. Acad. Sci., 1895, 424;. Rio 

 Presidio, Sinaloa: Jordan & Evermann, Bull. 47, U. S. Nat. 

 Mus., 1896, 819: Rutter, Proc. Cal. Acad. Sci., 1896,. 263; San 

 Jose del Cabo, Lower California: Evermann, Proc. Biol. Soc. 

 Wash., 1898, 2; Ixtapa (12 miles above the Bay of Banderas); 

 Maria Magdalena Island, 2,500 feet above tide-water; Maria 

 Cleofa Island, off Jalisco: Pellegrin, Bull. Mus. Hist. Nat. Paris, 

 1901, 205; river below Lago de Chapala, Estado de Jalisco: 

 Meek, Field Col. Mus. Pub. 65, 1902, 118; Balsas; Puente de 

 Ixtla; Cuicatlan. 



Fresh waters of the West Indies and the Atlantic and Pacific 

 streams of Mexico and Central America. (Cuautla; Jojutla, Vera 

 Cruz; Otopa; Motzorongo.) 



Head 3|to 4^; depth 4^ to 4X1 D. iv-i, 8; A. 11, 9; scales 12-42. 

 Body elongate, not much compressed; head rather conical, somewhat 

 decurved in specimens 9 or more inches in length; interorbital convex, 

 its width 2f^in head; snout blunt in large examples, more pointed in 

 the young; lips very thick in adults, thin in young specimens 2 to 4 

 inches long; maxillary reaching vertical from front of eye, entirely 

 hidden when the mouth is closed; diameter of eye about equal to 

 length of snout, 4 in head; origin of spinous dorsal nearer tip of snout 

 than base of caudal ; tip of pectoral reaching nearly to spinous dorsal ; 

 soft dorsal over the last ^ of the anal fin, without scales; anal spines 

 weak; pectorals inserted above the axis of the body. 



Color brownish above, silvery below; each scale with a darker mar- 

 gin; a silvery band from base of pectoral to caudal fin; very conspic- 

 uous on fishes in the water; back and sides with many black or dark 

 colored scales scattered about, making irregular spots; these most 

 abundant on small specimens from Vera Cruz, and least so on speci- 

 mens from Jojutla. 



There seems to be but little difference in the descriptions of A. 

 monticola and of A . nasutus; the difference is mainly in the thick and 

 thin lips, a character much modified by age. In this paper I regard 

 the specimens from western Mexico ascribed to A. nasutus as being 

 the adult of the present species. 



72. Neomugil Vaillant. 



Neomugil Vaillant, Bull. Soc. Philom., iv, 1893-4, 72. (Type, Neo- 

 mugil digueti Vaillant.) 



