200 [September, 



selves are large. The color is reddish brown above, silvery along the middle 

 of the flanks and yellowish beneath. 



Specimens of this species were collected in Leon River, a tributary of the 

 Rio San Antonio, by Dr. C. B. Kennerly, under Lieut. A. W. Whipple, U. S. A. 



4. MoNiANA PROSERPINA, is remarkable for its slender body, subconical head, 

 and very small mouth. The eye is of moderate development. The total length 

 is two inches and a quarter, the head constituting the fifih part of it. Eleven rows 

 of scales may be counted upon the line of greatest depth of the body. Greyish 

 brown above ; metallic greyish white upon the sides and beneath. 



From Devil's River, Texas ; collected by John H. Clark, under Col. J. D. Gra- 

 ham, U. S. A. 



5. MoxiANA AURATA. A most haudsome species, with a rather deep body 

 gradually tapering posteriorly, and a rounded and subtruncated head bearing 

 minute spines upon its upper surface. The eye is proportionally small, and the 

 mouth of medium size. Chesnut brown above; a diffused blackish streak along 

 the middle of the flanks; golden beneath. 



From Piedra Painie, New Mexico ; collected by John H, Clark, under Col. J. D. 

 Graham. 



6. MoNiANA coMPLANATA. The most compresscd of all the species so far known. 

 The profile is regular ; the peduncl'e 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 upon the sides and yellowish beneath. 



Collected at Brownsville, Texas, by Capt, Van Vliet, U. S. A. 



7. MoNiANA L,T.TABiLis. The body is subelliptical in profile, the tail slender. 

 The head well developed, being contained four times and a half in the total 

 length, which measures about two inches. The greatest depth is equal to the 

 length of the head. The fins are quite conspicuously developed; the scales 

 large, as usual in the genus, being also deciduous. Reddish brown above, yel- 

 lowish white beneath ; sides silvery. 



Specimens collected by H. B. MoUhausen, under Lieut. W. A. Whipple, in 

 Hurah Creek, a tributary of the Rio Pecos, of the Rio Grande del Norte (Rio 

 Bravo). 



8. MoNiANA PULCHELLA. Allied to M. lutrensis. but differing from it by a shorter 

 snout and a more compact tail. The eye is large also. A distinctive feature 

 between the two species is to be found in the squamation, since the scales are 

 more deeply imbricated in 31. lutrensis than in M. jjalchclla. The color is reddish 

 brown ; silvery upon the sides. 



Caught by H. B. Mollhausen, under Lieut. A. W. Whipple, U. S. A., in the 

 Sugar Loaf Creek, emptying its waters into the Poteau River, itself a tributary 

 of the Arkansas, near Fort Smith. 



9 MoNiANA PRiGiDA. This species is a little more than three 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 rather deep and very much 

 compressed ; the caudal fin deeply forked. The eye is circular, and its diameter 

 contained four times in the length of side of the head. 



The rays of the fins are, 



D 84-2; A 8 + 2: C G, 1, 9, 8, 1, G; V 8 ; P 13. 



The color is of a reddish brown above, silvery white beneath. The middle of 

 the flanks exhibits an indistinct or rather diffused silvery band, sometimes 

 blackish. 



Specimens of this species were collected by John II. Clark, under Col. J. D. 

 Graham, U. S. A., in the Rio Salado, Rio Sabinal and Rio Medina, all three 

 tributaries to the Rio S.in Antonio, and in the Rio Nueces also. It was likewise 

 caught in the Rio Frio, a tributary of the Nueces by Dr. C. B. Kennerly, under 

 Lieut. A. W. Whipple, U. S. A. 



