68 



UW1IED STATES AND MEXICAN BOUNDARY. 



Catal. No. of 



No. 



682 

 683 



spec. 



10 



6 



Sex 



s 



9 



Locality. 



List of specimens. 



Leon's Spring, Texas — 

 do 



When 



collected. 



1851 

 1851 



Whence obtained 



Col. J. D. Graham 



do 





Nature of 

 specimen. 



Alcoholic _ 



Collected by 



do 



John H. Clark 



do 



( 



4. CYPKINODON MACULAKIUS, B. & G. 



Plate XXXVII, Figs. 8—11. 



Spec. Char. — The head constitutes one-fourth of the entire length. The eye is moderate ; its diameter entering four times 

 in the length of the side of the head. The dorsal fin in the female is as long as high, its anterior margin being somewhat nearer 

 the insertion of the caudal than the extremity of the snout ; its base enters six times in the total length. The caudal is poste- 

 riorly sub-convex, and is contained nearly six times and a half in the total length. The anal is narrower, though deeper, than 

 the dorsal. The ventrals being very small, and inserted somewhat anteriorly to the dorsal fin. 



Syn. — Cyprinodon macularius, B. &. G. in Proc. Acad. Nat. Sc. Philad. VI, 1853, 389. 



The color above is reddish "brown, yellowish beneath, maculated with black ; the spots on the 

 sides having a tendency to arrange themselves into vertical bands. Dorsal blackish ; the other 

 fins dull yellow, greyish at their base. 



D 8 ; A 10 ; C 3, 1, 7, 6, 1, 2 ; V 7 ; P 12. 



Plate XXXVII, fig. 8, represents the female sex of Cyprinodon macular ius , size of life. 

 9, its teeth. Fig. 10, an outline from above. Fig. 11, a section of the body. 



List of specimens. 



Ficr 



Catal. No. of 



No. 



spec 



Bex 



Locality, 



When 

 collected 



992 



8 



Q 



Rio San Pedro (Rio Gila) 



1851 



Whence obtained. 







Col. J. D. Graham 



Nature of 

 specimen* 



Collected by 



Alcoholic 



Jno. H. Clark.. - 



l 





HYDRARGYRA SIMILIS, B. & G. 



Plate XXXV, Figs. 1—8. 



Spec Char.— Body elongated and sub-fusiform. Head sub-conical in profile, constituting somewhat more than the fourth 

 of the total length. Diameter of the eye entering five times in the side of the head. Dorsal fin higher than long, its base being 

 contained about nine times in the total length. The caudal fin, posteriorly sub-truncated, constitutes about the seventh of the 



total length. Anal 



Ventrals rather small. 



Pectorals of moderate development. Scales about as deep as long, anteriorly sub concave, posteriorly convex, with a few radia- 

 ting furrows upon their anterior section alone. 



SYS.—Hydrargy-a similis, B.& G. in Proc, Acad. Nat. Sc. Philad VI, 1853, 389. 



The back is bluish grey, the sides and abdomen yellowish. Transverse black bars in both 

 sexes. Fins unicolor in the female ; the dorsal fin of the male exhibiting a black spot at its 

 poslerior margin. 



Dll; A 8; 3,1,8,7,1,2; V5; P 18. 









