CYPRINIDA. — XXVI. 57 
Silvery, sides with some black specks. Illinois R. (Probably not 
a Notropis.) 
cc. Teeth 1, 4-4, 0; 1, 4-4, 1; or 1, 4-4, 2; the grinding surface more or 
less developed. 
h. Head comparatively large, 32 to about 4 in length ; teeth 1, 4-4, 1 ; 
species of small size. (Alburnops Girard.) 
z. Eye moderate, 4 in head in adult. 
106. N. gilberti Jordan & Meek. Slender, with long tail; head 
long, flattish above; snout moderate; mouth rather large, little 
oblique, the lower jaw included. Scales before D. 17; D. slightly 
behind V. Greenish, sides with dusky streak and dark specks. 
Head 4; depth 5. A.9. Scales 5-35-4. L.23. Iowa and Mo. 
(To Prof. Charles Henry Gilbert.) 
wi. Eye very large, 2} to 3 in head. 
107. N. boops Gilbert. Body compressed, the back elevated ; 
tail slender; snout short, not blunt ; mouth terminal, very oblique, 
lower jaw not included; maxillary to front of eye; D. over V.; 
12 scales before dorsal. Head 33; depth44. <A,7. Scales 5-36-2. 
Teeth 1, 4-4, 1, with deep, grinding surface, the inner edge strongly 
crenate. L.3. Olivaceous sides with dusky streak and dark specks. 
S. Ind. to Iowa and Ark., common S. W. in cold streams. (Bods, 
bull; dy, eye.) NV. scabriceps Jordan & Gilbert, not of Cope.) 
hh. Head short, bluntish, about 5 in length in adult ; species of large 
size and silvery coloration. (Hudsonius Girard.) 
108. N. hudsonius (De Witt Clinton). Spawn- Eater. 
“Smett.” Body elongate, moderately compressed; head short, 
with blunt snout; eye very large, 3 to 34 in head; mouth small, 
subinferior; lateral line slightly decurved; 12 to 18 scales before 
dorsal; fins rather small. Pale olive, young always with a round 
black spot at base of caudal ; sometimes a dark lateral band; fins un- 
marked. Head 4} to 5; depth 44 to5. D.8. A.8. Scales 5-39-4. 
Teeth variable, sometimes 2 in one of lesser rows, sometimes none 
of them with grinding surface. L.10. Lake Superior to N.Y., 
and S. in coastwise streams to Ga., abundant and very variable. N. 
specimens usually have teeth 2, 4-4, 1. Southern examples, Va. 
to Ga. (var. amarus Girard), usually have teeth 1, 4—4, 1 or 0. 
The species seldom ascends small streams. (From Hudson R.) 
bb. Scales very closely imbricated along sides of body, most of them deeper 
than long ; body usually compressed. 
j. Pharyngeal teeth usually 44, their edges serrate. (J/oniana Girard.) 
109. N. lutrensis (Baird & Girard). Adult with the body 
deep, strongly compressed, the back arched; young variously elon- 
gate or elliptical; head short, blunt; mouth moderate, oblique, the 
lower jaw included; eye small, about 4 in head; lateral line strongly 
