SIXTY-TWO SPECIES OF FISHES FROM LAKE ERIE 
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subsurface chromatophores along dorsal surface of intestine. The lateral surfaces 
are colorless except for the faint dusky band (unlike atronasus). The caudal is the 
only fin pigmented. 
BREEDING 
The long-nosed dace is apparently a spring spawner. Breeding males have 
cheeks, lips, and lower fins bright crimson. 
16. Semotilus atromaculatus atromaculatus (Mitchill). Horned dace, creek 
chub. [Semotilus atromaculatus (Mitchill). Jordan, Evermann, Clark, p. 117.] 
RECORD OF CAPTURE 
Although rarely taken from Lake Erie, the horned dace is common in all its 
tributaries, especially in the smaller creeks. 
DESCRIPTION 
Young horned dace are characterized by a very heavy black lateral band from 
tip of snout to base of caudal, where it widens into a well-defined black spot. Perito- 
neum typically pale, although in preserved specimens sometimes darkened, while in 
Campostoma anomalum it is always very black. The latter is easily confused with 
Semotilus atromaculatus in the younger stages, but if the specimens are large enough 
to have the lateral line, that of Campostoma will be found straight, while that of 
Semotilus dips abruptly over the first half of the pectoral. Of course, the peculiar 
elongate intestine of Campostoma surrounding the air bladder is always diagnostic, 
but its investigation necessitates dissection. 
14- O-millimeter stage. — Total length, 14.0; standard length, 12.5; length to vent, 
8.25; length of head, 3.4; diameter of eye, 1.1 ; greatest depth before vent, 2.8; depth 
behind vent, 1.7; length to dorsal, 7.0; to anal, 8.5 millimeters. Myomeres, 21 (or 
22) to vent plus 20 behind. Fins small; dorsal II, 7, inserted well behind ventrals; 
anal I, 8 (incomplete?), completely behind dorsal. Forward part of body rather stout 
but tail compressed, moderately elongate head heavy, rounded above; mouth moder- 
ate, oblique, lower jaw included, maxillary to pupil. 
Pigmentation.' — Both jaws, top of head, and dorsal aspect are covered through- 
out with large and small chromatophores. A lateral black stripe extends from tip 
of snout to base of caudal, being composed of 3 lines of heavy spreading chromato- 
phores. The lateral aspect below this band is colorless except for few chromato- 
phores near caudal. A few occur on underside beneath the jaws, pectorals, and one 
row along either side of ventral line from vent to caudal. About 60 subsurface, 
