eigenmann: fresh water fishes. 283 



Atheyinichthys micro/epido fa Gnnihtr, Cat. Fish. Brit. Mus. Ill, 403, 1861 ; 



Kner, Novara, Fisch. 222, 1869; ? Perugia, Ann. del Mus. Civ. di 



Stor. Nat. Ser. 2^, X (XXX), 620, 1891 (Mouth of the Rio Negro); 



Berg, Ann. Mus. Nac. Buenos Aires, IV, 28, 1895; Delfin, Catalogo 



Feces Chile, 47, 1901. 

 AtJieyina laticlava Cope, Proc. Am. Fhilos. Soc. XVII, 1878, 44 (Callao). 

 Habitat : (? Montevideo to) Valparaiso and northward in salt and fresh 

 water. 



No specimens of this species were collected by Hatcher. He says of it: 

 "One species, Atheritiopsis regia, of particularly fine flavor, is especially 

 common at certain seasons along the east coast. So abundant were these 

 fish in the inlet of the Gallegos river for several days during the spring 

 of 1898 that on one occasion they were brought in great schools by the 

 incoming tide and left stranded in such quantities on the shingle bed of 

 the north coast that, for a distance of twelve miles, or over, the beach 

 extending from North Gallegos to two or three miles above Killik Aike, 

 the shingle was covered to an average width of ten yards and to the depth 

 often of several inches with dead fish." 



Suborder Percomorphi. 



Cope, Proc. A. A. A. S., 1871, Indianapolis, 341. 



A dominant group of fishes of fresh and especially of salt water. 



Ventrals thoracic, with a spine and 4 or 5 rays ; lower pharyngeals usually 

 separate ; gills 4, a slit behind the fourth ; nares double on each side ; 

 scales ctenoid ; post temporal slender, divided at tip and not coossified with 

 skull ; bones of jaw distinct ; pectoral actinosts normal ; vertebrae 24-40. 



Family VIII. SERRANID^. 



Maxillary usually not sheathed by the preorbital (sheathed in Patagonian 

 species) ; anterior vertebrae without transverse processes ; all or most of 

 the ribs inserted on the transverse processes when these are developed ; 

 anal spines 3 ; pseudobranchiae well developed ; vomer with teeth ; lateral 

 line extending to base of caudal ; anal shorter than dorsal ; head not every- 

 where covered with rough scales ; second suborbital with an internal lamina 

 supporting the globe of the eye ; entopterygoid present ; six or seven 

 branchiostegals. 



