42 



UNITED STATES AND MEXICAN BOUNDARY. 



3. CAMPOSTOMA NASUTUM, Grd. 



Plate XXV, Figs. 9—12. 



Spec. Chaf.— -It is a short and rather compact species, with the peduncle of the tail rather tapering. Its most prominent 

 character consists in its thick and protruding snout, which overlaps the lower jaw more than in the species above referred to. 

 The head enters four times and a half in the tot »1 length. The scales are proportionally larger than in any of the known species 

 of this genus. 



Syn. — Campostoma nasutum, Grd in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 176- 



The ground color is greyish above, and whitish or yellowish beneath ; upper region of body 

 and flanks occasionally marmorated. A black patch at the base of the caudal and dorsal fins. 



XXV 



© 



dorsal region ; fig. 11, a scale from the lateral line ; and, fig. 12, a scale from the abdominal 



region. 



List of specimens. 



Cat 1. Cor. No. No. of 



No. 



of teeth. 



spec 



Locality. 



75 

 74 



When col- 

 lected. 



2GS0 

 2679 



10 

 4 



Cadereita, New Leon 



Acapulco, New Leon, Mex 



1853 

 1853 



Whence obtained 





Lt. D. N. Couch.. 



do 



Nature of 

 specimen. 



Collected by 



Alcoholic. Lt. D. N. Couch 



do 



do 



1. DIONDA SEKENA, Grd. 

 Plate XXVI, Figs. 9—12. 



Spec Char. — Its form is slender and elongated, the dorsal outline being nearly straight; the head enters five times and a 

 half in the total length. The eye is large and circular ; its diameter entering only three times in the length of the side of the 

 head. The insertion of the ventrals takes place immediately opposite the anterior margin of the dorsal fin. The pectorals are 

 long and slender, even more so than in D. episcopa. 



Stn. — Dionda serena, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 185G, 177. 



The dorsal region is light brown, the flanks and abdomen being silvery, with the scales of the 

 lateral line dotted with black, imitating spots. A black spot at the base of the caudal fin. 



D 1, 8 ; A 2, 7 ; C 4, 1, 9, 8, 1, 3 ; V 8 ; P 13. 



Plate XXVI, fig. 9, represents Dionda serena, size of life ; fig, 10 is a scale from the dorsal 



region ; tig. 1 1 



, a seal 



e lrom the lateral line ; ana, ng. lz, a seal 



List of specimens. 



e irom th 



e abdominal region. 



Catal. 

 No. 



Cor. No. 

 of teeth. 



No. of 

 spec. 



Locality. 



When col- 

 lected. 



Whence obtained. 



Nature of 

 specimens. 



Collected by — 



43 



2656 J 



10 



Rio Sabinal , Texas 



1854 



Major Emory 



Alcoholic . 





2. DIONDA TEXENSIS, Grd. 

 • ■ Plate XXVI, Figs. 21—24. 



Spec. Char. — Is a very characteristic species. The body is rather deep upon its middle, and the lateral line somewhat 



■ » • ■ 



deflexed. The head is quite small and sub-conical, entering five times and a half in the total length. The eye is large and 

 circular. The insertion of the ventral fin is placed a little posteriorly to the anterior margin of the dorsal. The dorsal region is 

 greyish brown ; the abdominal region greyish white ; a diffused greyish black band may be observed along the middle of the 

 flanks, embracing the lateral line beneath, and a black spot at the base of the caudal. The ventrals and pectorals are yellow. 



tjc. — Dionda texensis, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 177. 



