316 Bulletin 4y, Untied States National Museum. 



and Arkansas; not rare ; a most remarkable little fish, the only American 

 minnow with more than two barbels. (rETpa-, four; vF/^n, barbel.) 



Hyhopm tetranemvs, Gilbert, Bull. Washburn College Lab., 1880, 208, Elm and Sp ing creeks, 

 Medicine Lodge, Kansas. (Coll. Cragiii.) 



621. HTBOPSIS JESTIVALIS (Giranl). 



Head 3}; depth 5J. D. 8; A. 8j scales 6-36-4; teeth 4-4. Body slen- 

 der, with long caudal peduncle, the back scarcely elevated. Head long 

 and slender, the snout much i)rojecting and rather pointed. Mouth mod- 

 erate, inferior, the maxillary reaching posterior nostril. Barbels con- 

 spicuous, nearly as long as snout, about 3 in head ; each maxillary with 

 but a single one. Eye small, 4 to 4i in head. Fins rather long, the caudal 

 deeply forked, its lobes subequal ; dorsal over ventrals, nearer snout than 

 base of caudal. Color silvery; everywhere sprinkled with small black 

 dots; fins plain. Length 2\ inches. Arkansas Eiver to the Rio Grande, 

 abundant in sandy river channels, not in small brooks, (wstivalis, per- 

 taining to summer.) 



Gobio nvlivalis, Gikard, Proc. Ac.Nat. Sci. Phila., 185G, 189, Rio San Juan, near Cadereita, 



New Leon. (Coll. Couch.) 

 Ceratkhiithijs slcrletus, Cope, Zoiil. Wheeler Survey, v, 652, 1875, (1876), Rio Grande, at San Ilde- 



fonso'. New Mexico. (Type, No. 16973. Coll. Cope & Shedd.) 

 Ceratichthys sterletus and astivalis, Jordan & Gilbert, Synopsis, 210, 1883. 

 Hybopsis leslivalis, Jordan & Gilbert, Proc. U. S. Nat. Mus., 1886, 8. 



Represented in Central Texas by 



.521a. HTBOPSIS AESTIVALIS MARCONIS, Jordan A Gilbert. 



Eye larger than in (vstiralis, 3i in head ; caudal peduncle stouter than 

 usual, its least depth half greatest depth of body. Length 3 inches. 

 Abundant in Rio San Marcos, a clear stream issuing from an immense 

 spring at San Marcos, Texas; also known from the Guadalupe River, 

 near San Marcos, and the Rio Comal at New Braunfels. 



HybojKix ,'eslivaUs marconis, Jordan & Gilbert, Proc. U. S. Nat. Mus., 1880, 22, Rio San Mar- 

 cos, San Marcos, Texas. (Type, No. 36524. Coll. Jordan & Gilbert.) Evehmann & 

 Kendall, Bull. U. S. Fish Comm., xii, 1892, (1894), 104, plate 19, fig. 1. 



522. HTBOPSIS HTOSTOMUS (Gilbert). 



Head 4; depth 5^; eye 3J. D. 8; A. 8; lateral line 37. Body and 

 head very slender ; snout long, acute, projecting beyond mouth for half 

 its length; mouth short, wide, inferior; barbel long; pectoral large; 

 other fins small ; 13 scales before dorsal. Silvery, everywhere dusted 

 with dark specks ; fins pale, the lower lobe of caudal like the other. 

 Length 2i inches.. Indiana to Iowa, and south to the Alabama River ; 

 rather common in sandy river channels. (i)c,hog; frro/xn, mouth.) 



Nocomis hyontmum, Gilbert, Proc. U. S. Nat. Mus., 1884, 203, White River, Bedford, Indi- 

 ana. " (Type, No. 34980. Coll. Gilbert.) 



523. HTBOPSIS OELIDIS (Girard). 



Head 4; depth 5; eye 6J ; snout 2?. D. 8; A. 9; scales 6-44-4. Body 

 slender, not much compressed, back little arched ; head long and slender ; 

 mouth inferior, horizontal, broad, overhung by the very long, pointed 



