310 Mr. C. T, Regan on the Clupeoid I ishes 



10. SiGNALOSA, Everm. & Kendall, 1898. 



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



Month toothless, terminal, with lateral cleft; maxillary 

 normally foi-nieJ, extencliag- to below anterior edge of eye or 

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

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

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

 advance of orii^in of dorsal. About 40 scales in a longitudinal 

 series. Vertebrse 41. 



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



1. Signalosa mexicana. 



Chatoesms me.vicanus, Giinth. Cat. Fish. vii. p. 409 (186S). 

 Dorosoma mevicanum, Jord. & Everm. Ball. U.S. Nat. Mus. xlvii. 



1896, p. 416. 

 Sif/nnlosa atch'tfnlaycB, Jord. & Everm. t. c. 1898, p. 2809, fi?. 184. 

 signalosa mexicana, Meek, Zool. Publ. Columbian Mu3. v. 1904, p. 94. 



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

 33-. Diameter of eye 3^ to 4 in length of head ; maxillary 

 extending to below anterior edge or ^ of eye. 200 gill-rakers 

 on lower part of anterior arch. iVbout 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. Signalosa pefenensis. 



Meletta petenensis, Giinth. Proc. Zool. Soc. 1866, p. 603. 

 Chatoessus petetiensis, Giintli. Cat. Fish. vii. p. 408 (1868). 



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

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

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

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

 tudinal series ; ventual 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. 



