ICHTHYOLOGY. 



65 



6. TIGOMA PULCHRA, Grd. 









Plate XXXII, Figs. 5—8. 



The body is gracefully elongated, in which respect it resembles T. nigrescens, from which it 

 may be distinguished by its smaller head and larger scales. The color, moreover, is of a far 

 more brilliant type: the dorsal region is reddish or blackish brown, the sides and belly, of a 

 uniform golden yellow ; a diffused black streak may occasionally be seen along the upper 

 portion of the flanks, very likely more predominant in the male than in the female. 



Syn. — Tigoma pulchra, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 207. 



Plate XXXII, fig. 5, represents Tigoma pulchra, size of life; fig. 6, a dorsal scale; fig. 7, 

 a scale from the lateral line ; fig. 8, a scale from the abdominal region. 



List of specimens. 















» 





1 



Catal. Cor. No. 



No. of 



Locality. 



When col- 



Whence obtained. 



Nature of 



Collected by— 



No. 



of teeth. 



spec. 





lected. 





specimens. 





227 



2781 



3 



Chihuahua river and tributaries — 



1855 



John Potts, Esq. . 



Alcoholic. 



John Potts. Esq.- 



228 



2782 



4 



- 



1855 ' 



! do 



....do.... 



: do 



PTYCHOCHEILUS LUCIUS, Grd. 



Plate XXXIV, Figs. 1—4. 



A very characteristic species. The body is compressed, but the head is flattened or depressed 

 and very much developed, constituting nearly the fourth of the entire length. The dorsal and 

 ventrals are situated quite posteriorly. The scales are below the medium size, and the lateral 

 line is deflexed upon the abdomen. The pharyngeal bones are very slender ; the inferior limb 

 is almost exiguous and proportionally as long as in P. grandis. There are, however, but four 

 teeth upon the main row, instead of five, as in the case of P. grandis. Color bluish grey 

 above ; silvery golden beneath. 



Syn. — Ptychocheilus lucius, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 209. 



Plate XXXIV, fig. 1, represents Ptychocheilus lucius, size of life ; fig. 2 is a scale from the 

 dorsal region ; fig. 3, a scale from the lateral line ; fig. 4, a scale from the abdominal region. 



List of specimens. 



Catal. 

 No. 



Cor. No. 

 of teeth. 



203 



2757 



No. of 

 spec. 



Locality 



1 



Rio Colorado, Cal 



When col- 

 ic- 1. 



Whence obtained 



1854 



Major Emory 



Collected bv 



Alcoholic Arthur Schott 



9 



l 



