94 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



87. Dorosoma exile Jordan & Gilbert. GIZZARD SHAD; HICKORY 



SHAD. 



Dorosoma cepedianum exile Jordan & Gilbert, Proc. U. S. Nat. 

 Mus., 1882, 585; Galveston, Texas: Jordan & Evermann, Bull. 

 47, U. S. Nat. Mus., 1896, 416. 



Dorosoma mexicanum B. A. Bean, Proc. US. Nat. Mus., 1899, 

 539; Lago de Cademaco, south of Vera Cruz: Jordan & Ever- 

 mann, Bull. 47, U. S. Nat. Mus., 1896, 416: Meek, Field Col. 

 Mus. Pub. 65, 1902, 87; La Antigua. 



Lowland streams which flow into the Gulf of Mexico north of the 

 city of Vera Cruz. (San Juan; Forlon; Valles.) 



Head 4%', depth 2^ to 3; D. 12; A. 30 to 34; scales 29-56 to 60. 

 Body deep, compressed, the back elevated; ventral scutes i8-f-n; 

 origin of dorsal fin midway between tip of snout and opposite tips of 

 last anal ray; dorsal fin slightly behind ventrals, its filamentous ray 

 about as long as head ; least depth of caudal peduncle 2f m head. 



Color bluish brown above, silvery below; a black spot on the 

 shoulder. Length about 1 2 inches. 



41. Signalosa Evermann & Kendall. 



Signalosa Evermann & Kendall, Bull. U. S. Fish Comm., 1897 

 (Feb. 9, 1898) 127. (Type, Signalosa atchafalayce Evermann & 

 Kendall Chatoessus mexicanus Giinther.) 



Body short, deep and compressed, the form somewhat elliptical; 

 ventral outline more strongly curved than the dorsal; mouth small, 

 terminal, oblique, the lower jaw scarcely included; maxillary in three 

 pieces, broad and curved and without notch in outer margin; bran- 

 chiostegals 5; pseudobranchiae large; gill rakers short and very nu- 

 merous, about 340 in number ; no teeth ; adipose eyelid present ; last ray 

 of dorsal filamentous. 



88. Signalosa mexicana (Giinther). 



Chatoessus mexicanus Gunther, Cat., vn, 409, 1868; Mexico and 



Central America. 

 Dorosoma mexicanum Jordan & Evermann, Bull. 47, U. S. Nat. 



Mus., 1896, 416. 

 Signalosa atchafalaya Jordan & Evermann, Bull. 47, U. S. Nat. 



Mus., 1898, 2809. 



Louisiana to Central America, in lowland streams which empty 

 into the Gulf of Mexico. (Valles; Obispo; El Hule; Perez.) 



Head 3^ to 4; depth 2^ to 3; D. n or 12; A. 24 to 26; scales 

 15-42. Body rather deep, compressed; mouth terminal, rather large; 

 no teeth ; maxillary reaching vertical from anterior margin of pupil, 



