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



90 on ceratobrancliial o£ first arch. Scales more regularly 

 arranged and not so deep as in J3. lyrannus; about 48 in a 

 longitudinal series, 20 to 25 in a transverse series ; ventral 

 scutes 18-20 + 10-12. Dorsall7-19. Anal 18-22. Pelvics 

 below or in advance of origin of dorsal, Vertebrss 44. 



Northern Patagonia to Southern Brazil. 



Here described from the types, skins, 180 and 2G0 mm. 

 in length (the larger kindly sent to me for examination by 

 C. Forster Cooper, Esq.), and from four examples of 220 mm. 

 from Rio Grande do Sul. 



5. Ethmidium, Thompson, 1916. 

 Proc. U.S. Nat. Mus. 1. p. 458. 



Closely related to Brevoortiaj but with a median series of 

 scutes from occiput to dorsal iin. 



Etliviidium maculatum. 



Alausa maculata, Cuv. & Val. Hist. Nat. Poiss. xx. p. 430 (1847). 



Alausa ccerulen, Cuv. & V'al. t. c. p. 432. 



Llupea notacanthiis, Giiutli. Cat. Fish. vii. p. 443 (1868). 



Ciitpea viaculaia, Giintb. /. c. 



Clupea {Alosn) notacanihoides, Steiud. Sitzuugsb. Akad. Wien, Ix. 



18(39, p. 309, pi. vii. 

 Ethmidimn notacanthoides, Thompson, Proc. U.S. Nat. Mus. 1. 1916, 



p. 458. 

 • Ethmidmm ccerulea, Thompson, t. c. p. 460. 



Depth of body in the adult equal to length of head, 3 in 

 length offish ; in the young head relatively shorter and body 

 deeper. Diameter of eye 4 to 7 in length of head ; maxillary 

 extending to belov^^ posterior part of eye or beyond. 80 (young) 

 to IGO (adult) gill-iakers on lower part of anterior arch. 24 

 to 28 scutes from occiput to dorsal fin ; about 50 scales in a 

 longitudinal, 17 to 20 in a transverse series; ventral scutes 

 18-20 + 15-17. Dorsal 19-22. Anal 14-18. Pelvics 

 below anterior i of dorsal. Vertebise 50. tSiivery ; back 

 bluish ; sometimes a lateral series of dark spots. 



Peru and Chile. 



Four specimens, 100-280 mm. long, from Callao, Val- 

 paraiso, and Helladura Bay. 



6. Ethmalosa, gen. nov. 



Form rather deep and strongly compressed. Upper jaw 

 with median notch ; lower jaw included ; teeth minute or 

 absent. Adipose eyelid well developed ; cheek moderately 

 deep, with a naked area below the suborbitals. Operculum 



