NOTES ON FISHES FROM THE LOWER POTOMAC RIVER. 
G7 
scale and form well-defined longitudinal and diagonal stripes, as in tlie specimen 
figured. 
Tlie female is usually described as having no transverse markings, but sometimes 
a “few faint vertical shades.” Of the 45 adults preserved, 42 are marked with about 
15 distinct Clark crossbars narrower than the interspaces. The largest female obtained 
was 4J inches in length. 
Large specimens have head 3J ; eye 4 in head, 1 in snout, 2 in interorbital space; 
depth 3§. 
Immature males differ greatly from the adults. The following description, based 
on a full series, applies to young males : 
Body above light olive, below yellow, the sides marked by about 24 alternate dark 
and silvery transverse stripes, the former usually being considerably wider. As the 
size of the fish increases the back becomes darker and blends with the dark bars, 
leaving only the silvery bars, which become less distinct. In the smaller examples the 
silvery bars are about as wide as the dark ones. Dorsal dark, with a prominent white 
spot involving the last 3 or 4 rays, margined with black above and anteriorly. Anal 
much deeper than dorsal. Head, 3i to 3f ; eye, 3J in head, in interorbital space, § 
to l in snout; depth, 3§. Dorsal, 11; anal, 10 to 12. Scales, 37-13. Length, if inches. 
All immature females have the colors of the adult females, but are somewhat 
paler, the blackish bars being more distinct. Head, 3f ; eye, 3£ in head, f in snout; 
depth, 3f. 
In 13 specimens from J to 1,% inches long, the differential sexual characters, as 
before defined, are distinctly present, the stripes being somewhat more prominent than 
in the half- grown fish. The dorsal markings in the males, however, are absent in such 
small examples. Head, 3£; eye, 3J; depth, 4. Dorsal, 11 or 12 (14 in one specimen); 
anal, 10 or 11. Specimens of F. lieteroclitus of this size bear a strong superficial resem- 
blance to Zygonectes lucice , but are found to differ widely on close examination. 
6. Zygonectes luciae (Baird). (PI. xvm.) 
Under the name Hydrargyra lucice , Prof. Baird, in the Smithsonian Report for 
1854, described a small minnow from Great Egg Harbor, Hew Jersey. The types are 
unfortunately not extant, so far as known, and since that time the fish has not been 
met with, although Dr. T. H. Bean, in 1887, made diligent search in the region in 
which Prof. Baird collected his specimens. 
Two specimens, evidently males, taken on St. George Island, appear to agree 
remarkably well with the description of this fish, and no other disposition seems 
possible than to refer them to this lost species, a view which is shared by Dr. Bean. 
Prof. Baird’s description is as follows : 
General form elongated, though of rather short appearance. Head constituting less than one- 
fourth of total length. Insertion of anal slightly in advance of origin of dorsal, and rather more 
developed than the latter. Ventrals very small; their extremity reaching the anus. Tail large. 
D. 8; A. 9; C. 6, I. 8, 7, I. 5; V. 6; P. 15. Dark olive green above, lower part of sides and beneath rich 
ocher yellow. Sides with 10 or 12 broad, well-defined, vertically disposed dark bars, nearly as large 
as their interspaces, which are of a faint tint of greenish white. All the fins but the dorsal are of a 
uniform yellowish, lighter than the abdomen. Dorsal, yellow on the terminal half, the basal portions 
olivaceous, with a large black spot posteriorly, and immediately anterior to it a white one. The dark 
spot is bordered above and behind by the yellow part mentioned. In one specimen the posterior half 
of the base of the dorsal fin is dull white, with a large subcircular spot of black in the center. Length 
about 1 inch. Female similar, the dorsal unspotted, the yellow less intense. 
