CYPRINIDA. 51 
Genus: NOTROPIS. 
vey to Species. 
A. ‘Teeth 4-4, 1, 4-4, 0, or 1, 4-4, 1 (sometimes 2 teeth in one or both inner rows in JN. 
hudsonius and NV, heterodon). 
B. Scales not very closely imbricated, not notably deeper than long; dorsal in- 
serted nearly over the ventrals; no black spot on dorsal fin. 
(ee Teeth one-rowed, 4-4 (sometimes 2, 4-4, 2 in JV. heterodon). 
D. Lateral line usually more or less incomplete; small species, usually 
with a dusky lateral band. 
E. Mouth very small, chin pale.— cayuga. 
EE. Mouth moderate; chin black.— heterodon. 
DD. Lateral line always complete; small, weak species. 
F. Fins all small and low, pectorals not reaching ventrals.— 
blenntus. 
FF. Fins high, pectorals reaching ventrals.— volucellus. 
cc. Teeth two-rowed, 1, 4-4, 0; I, 4-4, 1; or I, 4-4, 2, the grinding surface more 
or less developed. 
G. Nodistinct dark spot at base of caudal.— shumarat. 
GG. A distinct dark spot present at base of caudal fin.— hudsontus. 
BB. Scales deeper than long, closely imbricated along side of body. Usually a dis- 
tinct black spot on last rays of dorsal.— whipplit. 
AA. Teeth 2, 4-4, 2 (2, 4-4, 1 in JV. eyunus). 
H. Anal fin short, of 7 to 9 developed rays. 
EG Teeth with the grinding surface developed. 
ie Scales closely imbricated along the sides, no dark spot at base of 
caudal.— cornutus. 
JJ. Scales not closely imbricated, a dark spot at base of caudal at least 
in young. 
K. 13 scales before dorsal fin.— heterodon. 
KK. 18 scales before dorsal.— hudsonius. 
Il. ‘Teeth without evident grinding surface, scales not closely imbricated. 
Ty. Eye very large, 22 in head; teeth 2, 4-4, 2.— artommus. 
Ll. Eye 3% in head. teeth 2, 4-4, 1.— Jejunus. 
HH. Anal fin long, of 11 or 12 rays; dorsal inserted behind ventrals. 
M. Scales not closely imbricated on sides, not crowded anteriorly. 
N. Kye very large, 244 to 3.— arge. 
NN. Eye smaller, 3% to 4. 
OQ. Front of dorsal midway between snout and base of caudal fin; 
eye 34— atherinoides, 
OO. Front of dorsal nearer to base of caudalthan to snout; eye 4.— 
rubrifrons. 
MM. Scales small and crowded auteriorly, closely imbricated; a black spot at 
base of caudal.— umbratilts. 
Notropis cayuga Meek. 
Head 4 or a little over; depth 4%; eye 3%. D. 8; A. 8; scalesin lateral 
line about 36, 14 before dorsal; teeth 4-4. Close to JV. heterodon, from 
which it can be distinguished most readily by the absence of any black on 
the chin. Lateral line wanting onsome scales. Jawsnearly equal. A black 
band along lateral line, continued forward along sides of head and around 
snout on upper jaw. Length 2% inches. 
