26 Field Columbian Museum — Zoology, Vol. V. 



c. Lips thin; mouth small; lower lip about twice page 



as thick as upper. 

 d. Body robust, its depth 2^ to 3 in length 



of body; head large, 3§ microstomas 27 



dd. Body elongate, its depth 3X to t> 2 A in 



length of body; head rather small, 4^ elongatus 28 



cc. Lips very thick; mouth large; lower lip 

 about as thick as upper; lips strongly papil- 

 lose; body very slender, its depth 3^2 labiosus 29 



20. Carpiodes meridionalis (Giinther). 



Sclerognathus meridionalis Giinther, Cat., vn, 23, 1868; Rio Usu- 

 macinta, Guatemala. 



Ictiobus meridionalis Jordan & Evermann, Bull. 47, U. S. Nat. 

 Mus., 1896, 164. 



Large rivers of Mexico south of the City of Vera Cruz and of the 

 east slope of Guatemala. (Perez.) 



Head 3^; depth 2-f ; D. 28 to 30; A. 9; scales 9-40-6. Body 

 elongate, compressed, dorsal region elevated; head small; mouth in- 

 ferior; lips moderately thick, papillose, the lower slightly the thicker; 

 hinder margin of lower lip rounded, the lobes not forming an angle; 

 snout short, blunt, its length 4 in head; diameter of eye 4 in head; 

 opercles striate ; origin of dorsal fin midway between tip of snout and 

 base of caudal; dorsal fin falcate, its longest rays shorter than the head; 

 base of dorsal 2)4 in head; tips of pectorals not reaching base of 

 ventrals by a distance equaling \{ length of the fin; pectoral \% in 

 head ; ventral 1 y^ ; least depth of caudal peduncle 2 in head ; caudal 

 fin forked, the lower lobe the broader and the shorter. 



Color brownish olive above, below silvery. Length 2 feet or more. 



The most southern range of this species, so far as known at pres- 

 ent, is the Rio Usumacinta in Guatemala. This fish is reported to 

 reach a weight of 20 to 30 pounds. It was very abundant in isolated 

 ponds near Perez. None of the specimens taken by me exceeded a 

 length of 1 2 to 14 inches. 



21. Carpiodes tumidus Baird & Girard. Metalote; Buffalo. 

 Carpiodes tumidus Baird & Girard, Proc. Acad. Nat. Sci. Phila., 



1854, 28; Rio Grande, Ft. Brown, Tex.: Jordan, Bull. U. S. 



Geol. Sur., 1878, 404, 666; Brownsville, Texas : Jordan & Snyder, 



Bull. U. S. Fish Comm.,1900, 119, lagoons near Tampico. 

 Ictiobus tumidus Girard, Mex. Bd. Sur., 34, pi. xix, figs. 1-4, 1859; 



Rio Grande, Ft. Brown, Texas. 

 Ichthyobus tumidus Garman, Bull. Mus. Comp. Zool., 1881, 89; 



Rio Nazas, San Pedro, Coahuila. 



