56 



UNITED STATES AND MEXICAN BOUNDARY. 



1. MONIANA AURATA, Grd. 

 Plate XXX, Figs. 13—16. 



A most handsome species, with a rather deep body gradually tapering posteriorly, and a 

 rounded and sub-truncated head bearing minute spines upon its upper surface. The eye is pro- 

 portionally small, and the mouth of medium size. Chestnut brown above; a diffused blackish 

 streak along the middle of the flanks ; golden beneath. 



Syn. — Montana aurata, Grd. in Proc.Acad. Nat. Sc. Philad. VIII, 1856, 200. 



^ate XXX, fig. 13, represents Montana aurata, size of life ; fig. 



from 



dorsal region ; fig. 15, a scale from the lateral line ; and, fig. 16, a scale from the abdominal 



region. 







List of specimens. 







Catal. 

 No. 



Corresponding 

 No. of teeth. 



No. of 

 spec. 



Age. 



Locality. 



When 

 collected . 



Whence obtained. 



Nature of 

 specimen. 



Collected by — 



118 



2703 



20 



Adult. 



PiedraPainte,N.M. 



1851 



Col. J. D. Graham.. 



Alcoholic . 





2. MONIANA COMPLANATA, Grd. 



Plate XXXI, Figs. 17—20. 



The most compressed of all the species so far known. The profile is regular ; the peduncle 

 of the tail rather slender. The total length is two inches and a half, the head entering in it 

 five times and a half. The mouth and eye are of but moderate size. Scales large and very 



deciduous. Pale red above, silvery on the sides, and yellowish beneath. 



Syn. — Montana complanata, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 200. 



Plate XXXI, fig. 17, represents Montana complanata, size of life ; fig. 18 is a dorsal scale ; 

 fig. 19, a scale from the lateral line ; and, fig. 20, a scale from the abdominal region. 



Catal. 

 No. 



94 



Cor. No. 

 of teeth. 



2G94 



No. of 

 Bpec. 



Locality. 



3 



Brownsville, Texas 



List of specimens. 



When col- 

 lected. 



Whence obtained 



Nature of 

 specimen. 



1852 



Capt. Van Vliet.... 



Alcoholic 



Collected by- 



Capt. Van Vliet-.- 



3. MONIANA FKIGIDA, Grd. 

 Plate XXX, Figs. 17—20. 



This species is a little more than thr^e inches in total length, and stands next to the largest 

 of the hitherto known species. The head forms about the fifth of the length. The body is 



