186 Field Columbian Museum — Zoology, Vol. V. 



175. Mugil cephalus Linnaeus. 



Mugil cephalus Linnseus, Sys. Nat., Ed. x, 316, 1758; Europe: 

 Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, 811. 



Tropical and temperate seas of America, southern Europe, and 

 northern Africa. (Tehuantepec.) 



Head 3f; depth 3$; D. iv-i, 8; A. 111, 8; scales 12-40. Body 

 elongate, compressed; head broad, depressed; interorbital slightly 

 convex, its width 2^ in head; mouth terminal, oblique; jaws about 

 equal; teeth minute; snout rounded laterally; adipose eyelid well 

 developed; diameter of eye about 4 in head; origin of spinous dorsal 

 midway between tip of snout and base of caudal; about 20 scales in a 

 series from tip of snout to origin of spinous dorsal; first dorsal spine 

 1 % in head ; pectoral fin nearly reaching front of dorsal , 1 § in head ; 

 ventrals reaching half way to anal fin, 1^4 in head; caudal forked; 

 least depth of caudal peduncle 2% in head. 



Color bluish brown above, silvery below; dark stripes along the 

 rows of scales, most prominent on the middle of the sides; fins more or 

 less dusky, with a yellowish tinge on the ventrals, anal, and caudal; a 

 black bar at base of pectorals; soft dorsal and anal fins naked. 



A salt-water fish which ascends rivers to a considerable distance 

 above tide-water. One specimen 5 inches in length was taken by me 

 at Tehuantepec. 



Subfamily Agonostominse. 

 71. Agonostomus Bennet. 

 Agonostomus Bennet, Proc. Comm. Zool. Soc, 1830, 166. (Type, 



Agonostomus telfairii Bennet.) 

 Dajaus Cuv. & Val., Hist. Nat. Poiss., xi, 164, 1836. (Type, Mugil 



monticola Bancroft.) 

 Body elongate, compressed posteriorly; mouth with lateral cleft 

 extending to opposite anterior margin of eye; snout bluntish, lower 

 jaw the shorter, included; edge of lower lip rounded, not sharp as in 

 Mugil; stomach not gizzard-like ; anal spines 2 , the first soft ray slender 

 and spine-like; villiform teeth on jaws, vomer, and palatines in Amer- 

 ican species. A small group of fishes inhabiting streams of mountain- 

 ous regions in tropical countries. 



Subgenus Dajaus Cuvier & Valenciennes. 



176. Agonostomus monticola (Bancroft). Trucha. 



Mugil monticola Bancroft, Griff. Anim. King. Fishes, 367, pi. 36, 

 1836. 

 • Agonostoma monticola Giinther, Cat.,111, 464, 1861; Mexico: B. A. 

 Bean, Proc. U. S. Nat. Mus., 1898, 540; Santa Maria. 



