2 Evenuann — Notes on Fishes of Mexico. 



This collection, though small, is of interest, in that it increases 

 our knowledge of the distribution of the species, and probably 

 indicates a close relation between the freshwater fish fauna of 

 the Tres Marias Islands and that of the adjacent mainland. 



LIST OF SPECIES. 

 Family Atherinidae. The Silversides. 



1. Chirostoma humboldtianum (Cuvier & Velenciennes). 



The collection contains 5 specimens of this species. They do not differ 

 materially from specimens from the City of Mexico, the type locality. 



Head Sj to 4^ in length of fish ; depth 4£ to 5J ; eye 3f to 4g in head ; 

 snout 3 to 3%. Dorsal IV-I, 10 to 12 ; Anal I, 16 to 19; scales 46, 13 to 

 15 in a transverse series. 



Family Mugilidae. The Mullets. 



2. Agonostomus nasulus Giinther. 



The collection contains one specimen from Ixtapa, 3 from Maria Mag- 

 dalena, and 2 from Maria Cleofa. 



The specimen from the mainland agrees well with those from the 

 islands. 



The specimens are from 2J to 4j inches in length and present the fol- 

 lowing measurements: Head 3] to 4; depth o'l to 4; eye 3| to ih in 

 head ; snout 3| to 4 ; interorbital width 2| to 31 ; maxillary 3} to 3£. 

 Dorsal IV-I, 8 ; Anal II, 9; scales 42 or 43, 11 in transverse series. 



Type locality, Rio Geronimo, Central America. 



Family Cichlidae. The Cichlids. 



3. Hero* band Jordan. 



Eleven specimens of this common species obtained at Rosario, July 27, 

 in the same pools from which the specimens of A in mux nelsoni were taken. 



Head 2;; ; depth 2\ ; eye 4; snout 2^. Dorsal XV, 11 ; Anal V, 7; 

 scales 6-30-11 ; pores in lateral line 19 -f 11. 



Type locality, Mazatlan, Sinaloa. 



Family Gobiidae. The Gobies. 



4. Aivaous nelsoni, new species. 



The collection contains 8 specimens of a goby which proves to be an 

 undescribed species of Awaous. 



Type locality, Rosario River, at Rosario, Sinaloa, Mexico. Collector, 

 E. W. Nelson, July 27, 1897. 



Type No. 48836, U. S. Nat. Mus. Cotypes Nos. 48837, U. S. Nat, Mus. ; 

 533 U. S. Fish' Conim. ; and 5793, L. S. Jr. Univ. Mus. Collector's 

 No. 839. 



