XXIV. THYRINA 59 



This species may be recognized at sight by its long snout. The 

 upper margin of the rami of the mandibles is curved upward anteriorly, 

 and but little elevated posteriorly. 



89. Thyrina chagresi (Meek and Hildebrand), 1914.-^*- 



Menidia chagresi Meek and Hildebrand, Publ. Field Mus. (Zool), 10, 119, 1914. 



Type-locality. — Gorgona, Panama Canal Zone. 

 Range. — Streams of the Atlantic drainage of Panama and Costa Rica. 



This species is a true Tiiyrina, most closely related to T. meeki 

 and T. brasiliensis. It differs from meeki in its shorter snout and 

 larger eye, and in the deeper base of the mandibular rami, and from 

 BRASILIENSIS in the shorter head, more posterior first dorsal, more com- 

 pressed belly, etc. 



90, Thyrina brasiliensis (Quoy and Gaimard), 1824.-^'- 



Atherina brasiliensis Quoy and Gaimard, Voy. Uranie, Poissons. 332, 1824; 



Cuvier and Valenciennes, Hist. Nat. Poiss., 10, 467, 1835. 

 Atherinichthys brasiliensis Giinther, Catalogue Fishes Brit. Mus., 3, 404, 



1861 (exclusive of Mexico record) ; Regan, Proc. Zool. Sac. London, 60, 1903. 

 [Basilichthys] brasiliensis Girard, [/. 5". Nav. Astron. Exp., 2, 238, 1860. 

 Menidia brasiliensis Jordan and Gilbert, Bull. U. S. Nat. Mus., 16, 408, 1883 



(reference only) ; Starks, The Fishes of the Stanford Expedition to Brazil 



(Stanford University), 41, 1913; Ribeiro, Rev. Mus. Pal, 10, 764, 1918; Arch. 



Mus. Nac. Rio de Janeiro, 17, Trematolepides, 12, 1915 (exclusive of Mexico 



record). 

 Chirostoma brasiliense Jordan and Evermann, Bull. U. S. Nat. Mus., 47, pt. 1, 



794, 1896. 

 Type-locality. — Rio de Janeiro, Brazil. 

 Atherina macrophthalma Agassiz, Pise. Brazil, 136, pi. 47, fig. 1. 1829. 



[Basilichthys] macrophthalma Girard, U. S. Nav. Astron. Exp., 2, 238, 1860. 

 Type-locality. — Rio de Janeiro, Brazil. 

 Range. — Salt and brackish waters of South America from Rio de Janeiro to Lake 



Maracaibo. 



In this species the upper jaw is longer than the lower, being slightly 

 hooked over it, and the outer premaxillary teeth are enlarged ; the first 

 dorsal origin lies slightly behind the vertical from the origin of the anal ; 

 the body is strongly compressed ; the body cavity is broadly rounded 

 posteriorly, and the air bladder is but slightly produced into the tail ; the 

 scales show bare traces of numerous fine apical radii and marginal crenu- 

 lations ; the eye is longer than the snout in the young, shorter than the 

 snout in the adult. The largest specimen examined is a mature female 

 113 mm. long to caudal. Two specimens, 37 and 41 mm. long to caudal, 

 the first to be recorded north of Brazil, were collected by Mr. W. H. 

 Osgood in Lake Maracaibo, Venezuela. 



