356 
BULLETIN OP THE BUREAU OF FISHERIES 
Family CYPRINODONTIM, Killifishes 
35. Fundulus diaphanus menona Jordan & Copeland. Barred killifish ; gray- 
back minnow. [Zygonedus diaphanus menona (Jordan & Copeland). Jordan, 
Evermann, Clark, p. 178.] 
RECORD OF CAPTURE 
The barred killifish is not abundant in Lake Erie, but can be found in sheltered 
bays and water only a few inches deep in the upper Niagara River. The specimens 
described were taken off Crescent Beach on June 29, 1929, in water 3 feet deep. 
DESCRIPTION 
The stout body and rounded caudal of the young killifish suggest Umbra limi, 
but they differ in having dorsal and anal fins inserted only slightly behind middle 
of body, whereas in the mud minnow the dorsal is well behind the middle and the 
short anal is on the last third of the body. 
7 .1 -millimeter stage : — Total length, 7.1; standard length, 6.0; length to vent, 2.8; 
length of head, 1.6; snout, 0.25; diameter of eye, 0.7 greatest depth before vent, 1.1; 
depth behind vent, 1.0 millimeters. Myomeres, 10 to vent plus 22 behind. Low dor- 
sal marginal fin fold originates at about thirteenth myomere behind head, continuing 
without a notch at peduncle into heterocercal, rayed tail ; distal end of caudal notched 
between rays; ventral marginal identical with dorsal, originating at vent. 
Pigmentation. — Chromatophores are distributed over whole body, especially on 
top of head and in irregular series on dorsal and ventral ridges. Lateral chroma- 
tophores are very stellate, delicate, more numerous along lateral line and distributed 
along line of each myotome. Much heavy pigment occurs at isthmus, continuing 
along mid-ventral line of stomach. There are a few chromatophores on unrayed 
pectorals, and the margin of each caudal ray is pigmented. 
12.3-millimeter stage . — Total length, 12.3; standard length, 11.1; length to vent, 
5.8; length of head, 3.4; snout, 0.75; diameter of eye, 1.1; greatest depth before vent, 
2.2; depth behind vent, 1.8 millimeters. Myomeres, 10 to vent plus 20 to 22 behind. 
