322 Bulletin 47, United States National Museum. 



rather elongate, compressed, the back elevated; head rather long and 

 low, the anterior profile gently curved, a little depressed over the eye ; 

 snout long, rather blunt at tip, 3 in head ; eye rather small, 5$ in head ; 

 mouth rather large, oblique, the lower jaw slightly included, the pre- 

 maxillary on level of pupil; maxillary reaching about to eye, 3| in head; 

 a very small, but evident barbel at tip, (overlooked in the original 

 description); preorbital broad; suborbital narrow ; opercle broad, silvery. 

 Lateral line complete, decurved anteriorly. Scales large, not closely 

 imbricated, those on breast and back little reduced. Dorsal high, pointed, 

 the anterior rays much longer than posterior, the first over ventrals and 

 over 17th scale of lateral line, 1 in head; caudal well forked; anal 

 short, pointed; pectorals pointed, reaching ventrals. Color pale oliva- 

 ceous above; sides silvery; fins plain; sexes alike. Length 15 inches. 

 Lakes and streams of Guanajuato, tributary to Rio Lerma, Pacific drain- 

 age. One of the largest minnows ; a food-fish of some local importance; 

 here described from specimens obtained by Mr. Woolman in Rio de Lerma, 

 at Salamanca, in Guanajuato, (altus, high, from the form of the body.) 



Hudsonius allus, JORDAN, Proc. U. S. Nat. Mus., 1879, 301, Lake Tupataro, Guanajuato. 



(Type, No. 23125-9. Coll. Dug&s.) 

 Cliola alto, JORDAN & GiLBERT, ; Synopsis, 163, 1883. 

 Hybopsis altus, WOOLMAN, Bull/U. S. Fish Comm., xiv, 1894, 61. 



Subgenus NOCOMIS, Girard. 

 536. HTBOPSIS KENTUCKIENSIS (Rafinesque). 

 (HORNY HEAD; RIVER CHUB; JERKER; INDIAN CHUB.) 



Head 4 ; depth 4. D. 8 ; A. 7 ; scales 6-41-4 ; teeth 1, 4-4, 1, or 1, 4-4, 0, 

 sometimes 4-4. Body rather robust, little elevated, not much compressed. 

 Head large, rather broadly rounded above; the snout conical, bluntish. 

 Mouth rather large, subterminal, little oblique, the lower jaw somewhat 

 the shorter ; upper lip rather below level of eye ; maxillary not reaching 

 to front of eye. Eye small, median, high up. Barbel well developed. 

 Suborbitals very narrow; preorbital large. Fins moderate; the dorsal 

 rather posterior, slightly behind insertion of ventrals; caudal broad, 

 little forked. Scales large, not crowded anteriorly, 18 rows in front of 

 dorsal. Lateral line somewhat decurved. Color bluish.olive; sides with 

 bright green and coppery reflections ; a curved dusky bar behind opercle ; 

 scales above with dark borders ; belly pale, but not silvery, rosy in spring 

 males ; fins all pale orange, without black spot ; males in spring with a 

 crimson spot on each side of head; adults with the top of the head 

 swollen, forming a sort of crest, which is sometimes a third of an inch 

 higher than level of the neck and is covered with large tubercles; 

 young with a dark caudal spot. Length 6 to 9 inches. Pennsylvania to 

 Wyoming and Alabama, on both sides of the Alleghanies; everywhere 

 abundant in the larger streams, seldom ascending small brooks; one of 

 the most widely diffused of our Cyprinidcej western specimens usually 

 have the teeth in two rows. Variable. 



Luxilus Jcentuckiensis, RAFINESQUE, Ichth. Oh., 48, 1820, Ohio River. 

 Catostomus melanotus, RAFINESQUE, I, c., 58, 1820, Ohio River, at the Falls. 

 Semotilm bigutlatus, KIRTLAND, Boat. Journ. Nat. Hist., 1840, in, 344, pi. v, fig. 1, Yellow Creek, 

 3 tributary of Mahoning River, Ohio. 



