XXIX. KRONIA 63 



to Thyrina, which it resembles in the trenchant edge of the short 

 belly, the anterior origin of the long anal fin, and in the slender rami 

 of the lower jaw. 



98. Eurystole eriarcha (Jordan and Gilbert), 1881. '^'■ 

 (Plate V, Fig. 19) 

 Atherinella eriarcha Jordan and Gilbert, Proc. U. S. Nat. Mtis., 4, 348, 1881. 

 Eurystole eriarcha Jordan, Proc. Cal. Acad. Sci. (2), 5, 418, pi. .32, 1895; 

 Jordan and Evermann, Bull. U. S. Nat. Mus., 47, pt. 1, 803, 1896 ; 4, pi. 125, 

 fig. 339, 1900; Osborn and Nichols, Bull. Amer. Mus. Nat. Hist., 35, 156, 1916. 

 Type-locality. — Mazatlan, Mexico, in a tide pool. 

 Range. — Gulf of California and adjacent regions. 



There are about 52 scales in the median longitudinal series in the 

 type specimen of E. eriarcha. 



XXVIII. PSEUDOTHYRINA Ribeiro, 1915. 



Pseudothyrina Ribeiro, Arch. Mus. Nac. Rio de Janeiro, 17, Trematolepides, W,- 

 1915. 

 Haplotype. — Pseudothyrina jheringi Ribeiro. 

 Range. — Southeastern Brazil. 



99. Pseudothyrina jheringi Ribeiro, 1915. 



Pseudothyrina jheringi Ribeiro, Arch. Mus. Nac. Rio de Janeiro, 17, Tremato- 

 lepides, 11, 1915; Ribeiro, Rev. Mus. Pal, 10, 763, 1918. 

 Type-locality. — Rio Grande do Sul. 

 Range. — Rio Grande do Sul, Brazil. 



This is one of the large atherines characteristic of temperate South 

 America. It is described as similar in form of body to Thyrina, but 

 it differs from that genus in the less backward insertion of the first 

 dorsal, the smaller size of the scales, etc. 



XXIX. KRONIA Ribeiro, 1915. 



Kronia Ribeiro, Arch. Mus. Nac. Rio de Janeiro, 17, Trematolepides, 9, 1915. 



Haplotype. — Kronia iguapensis Ribeiro. 

 Range. — Southeastern Brazil. 



100. Kronia iguapensis Ribeiro, 1915. 



Kronia iguapensis Ribeiro, Arch. Mus. Nac. Rio de Janeiro, 17, Trematolepides, 19, 

 1915. 

 Type-locality. — Iguape, S. Paulo, Brazil. 

 Range. — Southeastern Brazil (known only from the type locality). 



This large South American atherine differs little from Odontesthes, 

 insofar as the descriptions indicate. The scale margins are described 

 as "sub-laciniadas" in Kronia, as entire in Odontesthes ; the teeth in 

 bands in Kronia, in two series in Odontesthes. It is not clear from 

 the diagnosis of Kronia whether that genus has the peculiar pike-like 

 head and elongate abdominal region of Odontesthes. 



