GILBERT: FISHES OF THE SUBGENUS LUXILUS


posed entirely of shifting sand. Interestingly I also found here the
closely related Notropis cerasinus, which is ordinarily restricted to
headwaters of the Roanoke and New systems. Possibly both species
had temporarily moved or been washed out of a nearby tributary
where conditions were more to their liking.
 Populations of albeolus in the Neuse, Tar, and Cape Fear drain-
 ages are found more frequently in turbid situations than are those in
 the New and Roanoke systems. This probably reflects ecological
 differences rather than racial dissimilarities in physiological toler-
 ances, which are nevertheless possible, especially in view of the
 rather marked morphological differences between the two races.
 N. albeolus probably breeds in late April or early May, an estimate
based largely on circumstantial evidence. All spring collections I
examined were taken either in early April, late May, or early June,
and none contained gravid females or high tuberculate males.

 Notropis chrysocephalus

 Striped Shiner.
 DIAGNOSIS. A species of Luxilus distinguished from the closely
related Notropis cornutus by: larger scales, those in the anterior dorso-
lateral series (12) 13 to 16 (19); circumferential scales (23) 24 to 29
(32); sum of anterior dorso-lateral and circumferential scales (36) 37
to 45 (48); dorso-lateral scale pockets darkest around edges, which,
with the intensification of pigment caused by the overlapping scales,
results in three parallel stripes running lengthwise along dorso-lateral
part of back and meeting posterior to dorsal fin, thus forming distinct
"V's" when seen from above; pigment usually present on chin and
gular region; mid-dorsal stripe not turning brilliant golden in breed-
ing males; dorso-lateral part of back without a light olive stripe ex-
tending along back just lateral to dorsal stripe.
 DESCRIPTION. A large species of Luxilus, the males sometimes
attaining a length of 175 mm or more; body and head deep and com-
pressed, especially in adult males; pectoral fin rays 15 to 17 (18);
lateral-line scales (36) 37 to 40 (42); dorsal region brown; scale pockets
along side of body with considerable pigment on some scales forming
a number of vertical crescent-shaped bars; side of body metallic-
bronze in life; mid-dorsal stripe gray-black, slightly more than half
as wide as eye, and extending around base of dorsal fin.


1964