12 ACANTHOPTERYGII. 



ChonopJionis taiasica, Jord. & Eigcnm. Proc. U.S. Nat. Mus. 1886, p. 500'°; Eigenm. & 



Eigenm. Proc. Cal. Ac. (2) i. 1881, p. G8 " ; Meek, Zool. Pub. Columbian Mus. v. 



1904, p. 233 '^ 

 Chonophorus mexiconus , Jord. & Eigenm. t. c. p. 501 '' ; Eigenm. & Eigenm. 1. c. "" ; J\Ieek, 1. c'. 

 Aivaous taiasica, Jord. Proc. Cal. Ae. (2) v. 1895, p. 494.='; Jord. & Everm. Bull. U.S.Nat. 



Mus. xlvii. 1898, p. 223G '' ; Jord. & Snyd. Bull. U.S. Fish. Comui. 1900, p. 147 =' ; Meek, 



Zool. Pub. Columbian Mus. iii. 1902, p. 121 ='. 

 Aivaous me.vicanus, Jord. & Everm. t. c. p. 2237 '". 



Depth of body 5 to (i in the length, leug'tli of liead 3 to 3f. Dorsal YI, I 10. Anal I 10. 60 to 84 scale.'^ 

 ill a longitudinal series, 20 to 20 in a transverse series from origin of second dorsal to that of the 

 anal flu. Olivaceous ; back and sides with irregular dark spots ; sides of head with s])ots or oblique 

 lines ; a dark bar on the upper part of base of pectoral ; dorsal, caudal, and pectoral fins with series of 

 dark spots ; vcutrals and aual immaculate. 



Hah. Coasts and Rivers of Tropical America from Southern California to Panama and 

 from Mexico to Brazil, and also in the West-Indian Islands : 



Cape St. Lucas '^. — Presidio--; Puente de Ixtla; Balsas and Cuautla ; Rio 

 Balsas i'^ -^ ; Valles, San Luis Potosi ^'^ ; San Francisco, La Antip;ua and Perez, 

 Vera Cruz ^'^ -■-' ; Orizaba ^^' ; San Jose ^ ; Rio INIotagua (Salviii.) ; Panama ^~. — 

 Cuba 10^1 12 13. Haiti-; ^lartiuique ^ i^ St. Vincent, St. Croix i' ; St. Lucia i'; 

 Barbados 1" ; Tuiiidad [Giqi^)//) ; Brazil i*". 



Here described from several specimens, measuring up to 300 mm. 



2. Chonophorus traiisandeanus. 



Gobius transandeaiiHS, Giiutli. Cat. Fish. iii. p. 62 (18C1) '. 



? Awaous nelsoni, Everm. Proc. Biol. Soc. Washington, xii. 1898, p. 3 " ; Jord. & Everm. Bull. 



U.S. Nat. AIus. xlvii. 1898, p. 2235 '. 

 Gobius (jueiitheri, Regan, Ann. Mag. N. 11. (7) xii. 1903, p. 629 '. 



Differs from C. Jiannna especially in having only from 15 to IS scales between the origins of the soooud 

 dorsal and anal tins. 



Ilah. W]:sTEEX IMexico, Rosario, Sinaloa ^ 3_ — Western Ecuador i *. 



G. giientheri was based on male examples, which ditfer considerably from the 

 females. Probably A. nelsoni will prove to be identical with G. transdndcnnns, and 

 the species will be found to occur in all the Pacitic Coast streams from Sinaloa to 

 Ecuador. 



G. GOBIUS, Linn. 



Gobius, Joid. S: Everm. Bull. U.S. Nat. AIus. xlvii. 189S, p. 2210. 



iJody more or less elongate, compressed posteriorly; inoiitli nioderalc; jaws wilh several series of poinJ-ed 

 Iccth ; palate loolhless. Fyes [ilaci'd high; iiilt'iorliil al region not vei')" Miik'. tiill-opcnino' nearly 

 vertical, in front of the basi^ of pec(oral, not m- smrcdy produced i'or«ard below; no tiesliy tlaps on 

 pectoral arch. (Scales usually ctenoid. Two dorsals, the anterior of live to seven spines. Voutrals 

 completely united to form a rounded disc, uhich is free from the body and has a basal membrane. 



