310 Mr. C. T. Regan on the Clupeoid Fishes 



10. SiGXALOSA, Everm. & Kendall, 1898. 

 Bull. U.S. Fish. Coram. 1897, p. 127. 



Month toothless, terminal, with lateral cleft; maxillary 

 iiormally formel, extending to below anterior edge of eye or 

 a little beyond ; two supramaxillaries. Gill-rakers slender, 

 very numerons. Dorsal 13-16; last ray produced into a 

 filament. Anal 21-27. Pelvics 8-rayed, below or a little in 

 advance of oriu,in of dorsal. About 40 scales in a longitudinal 

 series. Vertebra? 41. 



Rivers from Southern U.S.A. to Central America. 



1. Stgnalosa mexicana. 



ChatoessHS mexicanus, Giintli. Cat. Fish. vii. p. 409 (1863). 

 Dorosoma mexicanum, Jord, & Everiu. Bull. U.S. Nat. Mus. xlvii. 



1896, p. 416. 

 Sif/nalosa atchafalayce, Jord. & Everm. t. e. 1898, p. 2809, fig. 184, 

 Siynalosa mexicana, Meek, Zool. Publ. Columbian Mus. v. 1904, p. 94. 



Depth of body 2f to 3 in the length, length of head 3 to 

 3|. Diameter of eye 3| to 4 in length of head ; maxillary 

 extending to below anterior edge or \ of eye. 200 gill-rakeis 

 on lower part of anterior arch. About 40 scales in a longi- 

 tudinal series ; ventral scutes 16-18 + 8-10. Dorsal 13-15; 

 origin equidistant from end of snout and base of caudal, or 

 nearer former. Anal 23-27. Pelvics inserted a little in 

 advance of origin of dorsal. A dark humeral spot. 



Louisiania to Central America, in rivers emptying into the 

 Gulf of Mexico. 



Nine specimens, 70 to 100 mm. in total length, 



2. Stgnalosa pefenensls. 



Meletta peteneyisis, Giinth. Proc. Zool. Soc. 1806, p. 603. 

 Chatoessus petenensis, Giiuih. Oat. Fish. vii. p. 408 (1868). 



Depth of body 3 in the length, length of head 31 to 3|. m 



Diameter of eye 3^ to 4 in length of head; maxillary ex- 9 



tending to below anterior ^ or edge of eye. 160 gill-rakers ~ 



on lower part of anterior arcli. About 40 scales in a longi- 

 tudinal series ; ventral scutes 14-16 + 10-12. Dorsal 15-16 ; 

 orio-in nearer to end of snout than to base of caudal. Anal 

 21-24. Pelvics inserted below origin of dorsal. A dark 

 humeral spot. 



Lake Peten. 



Four specimens, 70 to 90 mm. in total length. 



