



72 



UNITED STATES AND MEXICAN BOUNDARY 



The ground color is dark reddish brown above ; lighter beneath : the 



being margined with black. 



edge of 



the scales 



7; 4,1,7,7 



(Female.) 



XXXIX 



of life. Fig. 9, a 



front view of its mouth to show the dentition. Fig. 10, outline from above. Fig. 11, an 

 ideal section across the line of greatest depth and width. 



List of specimens. 



Catal. 



No. 



No. of 

 spec 



679 



6 



680 



1 



G81 



2 



Locality. 



Leon's Spring, Texas... 

 Camanche Spring, Texas 

 Zoquito, Texas 



When col- 

 lected. 



1651 

 1851 

 1851 



Whence obtained 



Nature of 

 specimen. 



Collected by 



Col. J. D. Graham Alcoholic . John H. Clark 



do 

 do 



do 

 do 



do 

 do 



2. GAMBUSIA AFFINIS, Grd. 

 Plate XXXIX, Figs. 12—15. 





Spec. Char. — Body elongated, sub-fusiform, and slender. Head rather small, constituting the fifth of the entire length. 

 The dorsal fin is narrow, its anterior margin somewhat nearer the extremity of the snout than the margin of the caudal fin. 

 Anal like the dorsal in size and shape. Ventrals slender and elongated ; pectorals moderate sized and elongated. 



STtt.—Heterandria affinis, B. & G. in Proc. Acad. Nat. Sc. Philad. VI, 1853, 390. 



Color yellowish brown above ; orange beneath. Fins unicolor, except the dorsal, which 

 exhibits narrow dark cross bands. The caudal is occasionally maculated with black. 



D G ; A 8 ; 3, 1, 7, 6, 1, 2 ; V 5 ; P 12. (Female.) 



Plate XX XIX, fig. 12, represents the female sex of Gambusia affinis, size of life. Fig. 13, 

 a front view of its mouth, exhibiting the dentition. Fig. 14, an outline from above. Fig. 15, 

 an ideal section across the line of greatest depth and width. 



List of specimens. 



Catal. 

 No. 



No. of 

 spec. 



677 



678 





3 



1 



Locality. 



Rio Medina, Texas 

 Rio Salado, Texas. 



When col- 

 lected. 



1851 

 1851 



Whence obtained. 



Col. J. D. Graham 



do 



Nature of 

 specimen. 



Collected by 



Alcoholic . . 



do 



John H. Clark 



do 



3. GAMBUSIA PATRUELIS, G r d . 



Plate XXXIX, Figs. 1—7. 



- 



Spec. Char.— Body elongated, su})-fusiform, compressed. Head constituting the fifth of the entire length, although larger 

 than in G. affinis. The dorsal fin is somewhat smaller than the anal, and its anterior margin nearer the posterior edge of the 

 caudal than the extremity of the snout. The origin of the anal is placed further in advance of the dorsal than in any of the 

 species of the genus figured on the accompanying plate. The ventrals are rather small, whilst the pectorals are broad and 

 considerably moie developed than in the other species. 



Stn.— Heterandria patruelis, B. & G. in Proc. Acad. Nat. Sc. Philad. VI, 1853, 390. 









