820 Bulletin 47, United States National Museum. 



when mouth is closed. Interorbital space convex, 2f in head. Anterior 

 dorsal commences nearer snout than base of caudal , and above tenth 

 scale of lateral line ; its anterior spines rather strong, 2 in head. Soft 

 dorsal a little higher than the spinous, not scaly, commencing above the 

 twenty-fourth scale, or above the fourth anal ray ; caudal fin emar- 

 ginate ; anal fin somewhat higher than the dorsal, spines feeble, the first 

 quite rudimentary ; pectoral inserted above the middle of the depth of 

 body, as long as distance from nostril to posterior edge of opercle. Back 

 grayish green, each scale with a brown margin ; a silvery band from 

 base of pectoral to caudal fin ; lower parts silvery ; base of pectoral 

 blackish. (Gunther.) Rivers of Central America, on both sides of the 

 isthmus, north to Lower California.* (nasutus, long-nosed.) 

 Agoiwstoma nasutum, GUNTHER, Cut., in, 463, 1861, Rio Geronimo; GUNTHEU, Fishes Central 

 America, 444, plate 70, fig. 2, 1866. 



1197. AGONOSTOMUS MICROPS, Gunther. 



Head 3 ; depth 4J ; snout much longer than eye of male, which is 

 6i in head. Dorsal IV-I, 8; anal III, 9; scales 43-12 in transverse 

 series. Bands of villiform teeth in the jaws, on the vomer, and on the 

 palatine and pterygoid bones. Upper lip thick, protruding anteriorly; 

 maxillary extending beyond the vertical from anterior margin of eye ; 

 2i to 3 in head ; interorbital space convex. Distance between dorsal 

 fins not as great as length of head; anterior dorsal commencing midway 

 between snout and base of caudal. (Giinther.) Streams of West Indies 

 and Central America. (fitKpbz, small; <*n/>, eye.) 



Agonostoma microps, GUNTHER, Cat., in, 462, 1861, probably West Indies. 

 Dajaus microps, GUNTHER, Fishes Central America, 444, plate 70, fig. 1, 1866. 



368. JOTURUS, Poey. 



Joturus, POEY, Memorias, n, 263, 1861, (pichardi). 



Large fresh-water mullets, with the head heavy, the blunt and tumid 

 snout projecting beyond the small, inferior mouth ; mouth broad, with 



* Specimens from San Jose del Cabo, near Cape San Lucas, obtained by Mr. Lyman Belding, 

 are thus described: 



Head 4% to 4^ in length (to base of caudal); eye 4% in head; maxillary not longer than 

 interorbital width, contained 2% to 3% times in head; a band of pterygoid teeth often but not 

 always developed; dorsal spines very strong, not flexible, the origin of the fin nearer snout 

 than tail; caudal well forked, the middle rays 1% in outer; maxillary usually extends slightly 

 beyond front of orbit. 



Other specimens obtained by the Hopkins Expedition at Mazatlan are described as follows: 



Head 4%; depth 4%. D. IV-I, 8; A. II, 10; scales 43-13. Eye 3% in head; snout 3%; max- 

 illary 3%. Pectoral 1% in head; caudal as long as head. Body moderately elongate, not much 

 compressed; nape prominent, rounded. Interorbital space much rounded, its width 3 in head. 

 Preorbital narrow, as wide as pupil; mouth rather small, the maxillary reaching front of pupil; 

 lower jaw included. Eye large, without adipose eyelid. Teeth small, sand-like, in bands; 

 vomer roughish. Gill rakers slender, close-set. Pectoral short, not reaching spiuous dorsal, 

 the ventrals inserted under middle of its length; ventrals with a small accessory scale; anal and 

 soft dorsal scaleless, their free edges concave; caudal well forked. Olivaceous; sides creamy; 

 belly silvery; back and sides with many black scales scattered about, making irregular spots. 

 Pectoral with a conspicuous black bar at base, crossed by a pale streak; a narrow dark rim 

 around lower half of eye. Fins all creamy yellow, the upper ones dotted and clouded with 

 black. Young with a black blotch on first dorsal, surrounded by orange. Pectoral bar and 

 mottled scales of body evident in young and old. Length 8 to 12 inches. Rivers of Sinaloa; 

 very abundant in rapid places in clear waters; our specimens from Rio Presidio. Locally 

 known as Trucha or Trout. 



