334 Field Museum of Natural History — Zoology, Vol, X. 



aa. Body somewhat deeper, the depth 3.1 to 3.3 in length in speci- 

 mens about 150 mm. long; mouth large, the maxillary reaching 

 nearly to vertical from middle of eye. macr acanthus, p. 335. 



69. Agonostomus monticola (Bancroft). 



Mugil monticola Bancroft, in Griffith's Edition Cuvier's Animal King- 

 dom, Fishes, 1836, 367, PI, 36 (West Indies). 

 Agonostoma monticola Giinther, Cat. Fish. Brit. Mus., Ill, 1861, 464 



(West Indies). 

 Agonostoma nasutum Gunther, Cat. Fish. Brit. Mus., Ill, 1861, 463 (Rio 



San Geronimo, Guatemala) , and Trans. Zool. Soc. London, 1868, 444, 



PL 70, fig. I. 

 Neomugil digueti Valliant, Bull. Soc. Philom., IV, 1894, 73 (Lower 



California). 

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



XLVII, 1896, 819, fig. 347; Regan, Biol. Cent. Amer., Pisces, 1907, 



66; Meek, Field Mus. Nat. Hist. Pub., Zool. Ser., X, 1914, 118 (both 



slopes of Costa Rica) . 

 Agonostomus nasutus Jordan & Evermann, Bull. U. S. Nat. Mus., XLVII, 



1896, 819; Regan, Biol. Cent. Amer., Pisces, 1907, 68, PI. X, fig. 4. 



Head 3.4 to 4.1; depth 3.1 to 4.1; D. IV-I, 8; A. II, 10; scales 39 to 43. 



Body compressed; upper profile gently convex; head rather small; 

 snout conical, 3.2 to 4.1 in head; eye 3 to 4.0; interorbital 2.85 to 3.4; 

 mouth moderate, nearly horizontal; upper jaw somewhat in advance of 

 the lower; upper lip various, thin, moderately thick, or very thick, its 

 upper margin elevated or not at tip of snout; maxillary reaching to or 

 a little past vertical from anterior margin of eye, 2.6 to 3.2 in head; 

 teeth in bands on jaws, vomer and palatines, the jaw teeth mostly with 

 serrate margins, some with lance-shaped apices; gill-rakers rather short, 

 17 to 20 on lower limb of first arch; scales rather large, ctenoid, extend- 

 ing forward to interorbital area, about 1 2 rows between anterior rays of 

 second dorsal and anal; origin of first dorsal notably nearer tip of snout 

 than base of second dorsal, the anterior 2 spines of equal length poste- 

 riorly when deflexed, the first one somewhat longer than eye and snout; 

 origin of second dorsal nearer origin of the first dorsal than base of 

 caudal, the outer margin of the fin concave; caudal fin with small scales 

 on basal half, moderately forked; anal fin similar to second dorsal, but 

 a little longer, its origin slightly in advance of second dorsal, with 2 

 spines, the first one minute and hidden in the skin in adult; ventral fins 

 inserted under middle of pectorals, a little nearer origin of anal than tip 

 of snout; pectoral fins placed high, of about the same length as ventrals, 

 1.32 to 1.5 in head. 



