Jordan and Ever mann. Fishes of North America. 261 



406. NOTROPIS HETERODON* (Cope). 



Head 4 ; depth 4 ; eye 3 in head. D. 8 ; A. 8 ; scales 5-36-3, the lateral 

 line extending about half length of body ; teeth 4-4, (sometimes 2, 4-4, 

 2, see below), often creuate. Body moderately stout, the back somewhat 

 elevated. Head rather pointed, the muzzle acuminate. Mouth oblique; 

 lower jaw projecting; upper lip opposite upper rim of pupil. Maxillary 

 extending to opposite front of orbit. Thirteen scales in front of dorsal. 

 Lateral line usually more or less imperfect. Color olivaceous ; chin black; 

 a blackish rostral band ; sides with a leaden or dusky band. Length 2 

 inches. New York to Michigan and Kansas, common. Variable, (trtpof, 

 varying; odovs, tooth.) 



AUtnniops heterodon, COPE, Proc. Ac. Nat. Sci. Phila., 1864, 281, Lansing ; Grosse Isle, 

 Michigan. 



Notrnpis gcrmanus, HAY, Proc. U. S. Nat. Mus., 1887, 252, Smoky Hill River, Wallace, 

 Kansas. (Type, No. 37949. Coll. Hay.) 



Notropis heterodon, var., GILBERT, Proc. U. S. Nat. Mus., 1884, 207, Switz City, Indiana, tribu- 

 tary of White River. (Coll. Gilbert.) 



Hybopsis heterodon, COPE, Cypr. Penn., 382,1866. 



Leuciscus heterodon, GUNTHER, Cat., vn, 261, 1868. 



Hemitremia helerodon, JORDAN & GILBERT, Synopsis, 163, 1883. 



Subgenus ALBURNOPS, Girard. 



407. NOTROPIS FRETENSIS (Cope). 



Head 4; depth 5; eye 3i in head, as long as snout. D. 8; A. 8; scales 

 6-35-3 ; teeth 4-4. Body slender and compressed. Mouth quite oblique, 

 the middle of the premaxillary being opposite line of pupil ; maxillary 

 not reaching to orbit. Seventeen rows of scales in front of dorsal. Lateral 

 line decurved. Olivaceous ; a dark median dorsal band ; a plumbeous 

 silvery lateral shade; cheeks silvery ; a dark spot at base of caudal; fins 

 plain. Length 1\ inches. Detroit River, Michigan. (Cope.) A doubt- 

 ful species, perhaps identical with Notropis cayuga. (frelensis, inhabiting 

 fretum or straits, i. e. Detroit River.) 



Hylopsis fretensis, COPE, Cypr. Penn., 382, 1866, Detroit. 

 Cliola fretensis, JORDAN & GILBERT, Synopsis, 167, 1883. 



408. NOTROPIS BLENNIUS (Girard). 

 (STRAW-COLORED MINNOW.) 



Head 4 ; depth 5; eye large, 3 in head. Scales 5-36 (32 to 38)-4; teeth 

 4-4. Body moderately stout, little compressed. Head rather broad, witli 

 rounded angles. Mouth small, inferior, horizontal; snout very obtiisr; 



* Notropis heterodon is apparently subject to large variations. The following description is taken 

 from specimens referred by Dr. Gilbert to this species, although there is a possibility that the 

 form in question is really distinct and allied to N. xttnocephalus : 



Head 4 ; depth 4%. D. 8 ; A. 7 ; lateral line 37, 13 scales before dorsal ; teeth 2, 4-4, 2, with 

 strong grinding surface, the edge of some teeth denticulate. Body slender, compressed, the 

 form and appearance as in 2V. heterodon. Head small, the snout short and rather sharp, slightly 

 decurved. Mouth small, oblique, the maxillary barely reaching front of eye, 4 in head ; snout 

 4 ; eye very large, 3 in head. Dorsal inserted just before ventrals ; pectorals not reaching ven- 

 trals. Lateral line complete, little decurved ; scales not crowded. Dark olive above, the scales 

 with dark edges; a dusky streak along sides, ending in a spot at base of caudal, this streak 

 extending forward around snout ; dark specks along pores of lateral line ; a row of specks along 

 base of anal ; fins unmarked. Length 2 inches. Sluggish streams of Indiana and Illinois. 

 This description taken by Dr. Gilbert from specimens from Switz City Swamp, Indiana. Differe 

 from the ordinary heterodon in the number of teeth and in the complete lateral line. 



