REPORT OF COMMISSIONER OF FISH AND FISHERIES. [48] 



156.— CHARACODON ' Gunther. 



555. Characodon furcidens Jordan & Gilbert. P. 



157.— ADINIA Girard. 



556. Adinia multifasciata^ Girard. S. (545&.) 



158.— FUNDULUS Lac^pMe. (158) 

 ^ Hydrargyra. 



557. Pundulus majalis'' Walbaiim. N. (532) 



558. Fundulus similis Baird & Girard. S. (534) 



559. Fundulus parvipinnis Girard. C. P. (536) 



$ Fundulus. 



560. Fundulus zebrinus "I Jordan 4& Gilbert. Vsw. (530) 



1 Characodon Gunther. 



(Giintber, Cat. Fish. Brit. Mus., VI, 1866, 308; type Characodon lateralis Giinther.) 



This genus differs from Cyprinodon, chiefly in the presence of a small hand of villi- 

 ibrm teeth behind the incisors. The incisors are bicuspid or Y'Shaped, and the ver- 

 tical fins are longer than in Cyprinodon ; fresh waters of Mexico and Central America ; 

 two species known. (Xnpo^, a sharp stake; oiJwv, tooth.) Characodon furcidens Joi- 

 •<lan & Gilbert, Proc. U. S. Nat Mus., 1882, 354 ; streams tributary to the Gulf of Cali- 

 fornia, and southward; abundant. 



6- The grouj) Adinia, defined on page 891 in the Synopsis, may be recognized as a 

 •distinct genus, intermediate between Cyprinodon and Fundulus, having the form of 

 body and restricted gill openings of the former and the dentition of the latter. The 

 -single species {Fundulus xenicus Jor. & Gilb.) may stand as Adinia multtfasciata. 



^Fundulus swampina, a doubtful species probably based on a confusion of several 

 species, is hero omitted. 



* Fundulus zehrinus is thus redescribed by Professor Gilbert (Bull. Washburn Lab. 

 J^at. Hist., 1, 1884, 15), from specimens taken at Ellis, Kans. : 



"Head and body shaped much as in Fundulus similis, but the snout somewhat less 

 elongate. Width of prtorbital about 6i in length of head ; eye moderate, 4 to 4^ 

 in head, 1| in interorbital width; posterior margin of orbit in middle of length of 

 head ; teeth in both jaws in a villiform band, with the external series much enlarged; 

 interorbital width 2j in head ; snout 3|. 



" Branchiostegals 5. 



" Dorsal fin long and ratner ow, the base longer and the rays higher in males than 

 in females; origin of dorsal nearly equidistant between snout and margin of caudal, 

 slightly nearer the snout in males, and nearer end of caudal in females ; base of dorsal 

 in males 6 to 6^ in total length, the highest dorsal ray about half head; in females 

 the base is 7^ in total length. Origin of anal opposite that of dorsal in males, behind 

 it in females ; in the latter the anal is sharply angulated, the anterior rays more than 

 thrice the height of the jtosterior, and more than two-thirds length of head. In males 

 the margins of both dorsal and anal fins are evenly rounded, the anal is the highest, 

 its rays beset with minute white prickles. Oviduct forming a low sheath along base 

 «f anterior half of anal. Pectorals not reaching base of ventrals, equaling distance 

 from snout to preopercular margin. Ventrals about reaching vent. Caudal truncate, 

 li in head. 



" Scales very small, in about 60 oblique series from opercle to base of caudal ; about 

 21 in an oblitiue series from vent upwards to middle of back : no enlarged humeral 

 scale. In males the margins of scales are rough with minute tubercles. 



" Head 3^ to 3f in length; depth 4^ to 4|. D. 14 or 15 ; A, 13 or 14. L. 3 inches. 



^* Color: Greenish above, sides and below silvery-white, the sides tinged with sul- 



