FISHES OF MISSOURI AND ARKANSAS. 
117 
3. Noturus exilis Nelson. 
Anal rays, 15 to 17 ; head, 4.1 in length of body ; depth, 7. Dorsal, anal, and cau- 
dal fins each with a narrow, dusky border. Little Dry Fork ; comuiou. 
4. Catostomus nigricans (Le Sueur). 
Meramec Eiver, scarce; Meramec Spring, Big Dry Fork, not common. 
5. Catostomus teres (Mitchill). 
Abundant in the Meramec Spring outlet. A few specimens were taken from the 
Meramec Eiver and the Little Dry Fork. 
6. Minytrema nielanops (Rafinesque). 
Dorsal rays, E3 ; scales, 45 to 46; depth, 4J; Meramec Spring outlet; common. 
7. Moxostoma duquesnei (Le Sueur). 
Scales 46 to 48 in specimens from Meramec Spring Outlet. Meramec Spring, very 
abundant; less common in the Meramec Eiver and the Little and Big Dry Forks. 
8. Campostoma anomalum (Ralinesque). 
Tubercles on the head and body, on some specimens from the Meramec Spring. 
Very abundant in Meramec Eiver and Spring; scarce in Big and Little Dry Forks. 
9. Chrosomus erythrogaster Rafinesque. 
Males from Spring Outlet with much red on sides and belly. Abundant in Meramec 
Spring Outlet; one specimen from the Big Dry. This species abounds in clear, cool 
water. 
10. Hybognathus nubila (Forbes). 
Below eye, at base of pectoral, ventral, anal, and caudal fins faint red on males. 
All specimens have a dark lateral band ; no black spot at base of caudal flu. Scales 
35 to 38. Origin of first dorsal ray slightly nearer tip of snout than base of the 
caudal. Very common in the Meramec Eiver; scarce in the Little Dry Fork. 
11. Pimephalea notatus (Rafinesque). 
Meramec Eiver and Big Dry Fork ; scarce. 
12. Notropia cayuga Meek. 
Mouth small, its gape nearly horizontal ; snout blunt, its length 3| in length of 
head. Eye rather large, its diameter 2f to 3 in head. Head 4:J in length of body ; 
depth 4| to 4|. Back slightly elevated. Dorsal fin slightly nearer tip of snout than 
base of caudal fin. Thirteen scales before dorsal, 37 scales in the lateral line. Color, 
olivaceous, paler below. Sides with a dusky band, consisting of small dark dots; 
the band extending on snout of the upper lip only. Meramec Eiver, scarce. 
13. Notropis boops Gilbert. 
(Notrojns scabriceps Jordan & Gilbert, Proc. U. S. Nat. Mus., 188.5, .J; not of Cope.) 
Scales in the lateral line 35 to 36. Head 4|- ; depth 4^ to 4§. Eye vei'y large, its 
diameter in head. Teeth 1 — 4 — 4 — 1 : tips hooked, no evident grinding surface, 
edges crenate Big Dry Fork, abundant ; Meramec Eiver and Little Dry Fork, scarce. 
14. Notropis whipplei (Girard). 
Big Dry Fork, not common. 
15. Notropis megalops (Rafinesque). 
Scales on the anterior part of body little if any smaller than those on rest of 
body. This is true of all specimens taken by us in the Missouri and Arkansas. 
Thirteen to 17 scales in front of dorsal fin. Sides silvery, with a darkish plumbeous 
baud, less conspicuous thau in N. zonatus. The young of this species and of N. zona- 
tus appear very much alike. 
