GILBERT: FISHES OF THE SUBGENUS LUXILUS


 of lateral line. Pigment present only on upper half of
 cleithrum, usually relatively light in adults. Area be-
 tween lateral line and lateral stripe on middle part of
 body pigmented. Pigment equally distributed above
 and below lateral line on caudal peduncle. Little pig-
 ment present around edges of dorso-lateral scales, with
 no parallel crooked lines along back. Breeding colors
 usually more subdued ------ Notropis pilsbryi
 Red, Arkansas and White river systems excluding the
 Black River; Arkansas, Missouri, eastern Kansas, and
 eastern Oklahoma.
3b. No prominent black stripe along length of body and head
 (some darkly pigmented juveniles have an indistinct dark
 stripe). Body usually deep and compressed (often slender
 and terete in N. albeolus). Black crescent-shaped bars usu-
 ally present on side of body (ordinarily absent in N. albeo-
 lus). Insertion of dorsal fin directly above insertion of pel-
 vic. Nuptial tubercles well developed, not granular. Lat-
 eral scales without prominent scallops on posterior margin ___5
 5a. Black, crescent-shaped marks on side of body very prom-
 inent, numerous, and distinct. Dark upper half of head
 sharply contrasting with light lower half, particularly in
 breeding males. Nuptial tubercles present in both sexes
 though much better developed in males; tips of tu-
 bercles in breeding males curved forward at tips.
 Scales on dorso-lateral part of body with a fine line about
 a quarter of the way from and paralleling outer edge.
 Caudal peduncle scales usually 14 or 15 (7-2-5 or 6).
 Size relatively small, not exceeding 90 mm. ---
 --------------- Notropis cerasinus
 Roanoke and New river systems in Virginia and North
 Carolina.
 5b. Black, crescent-shaped marks on side of body usually
 prominent and distinct, though less so than in N. cerasi-
 nus (marks ordinarily absent in N. albeolus). Dark up-
 per half of head not contrasting so sharply with lighter
 lower half. Nuptial tubercles normally present only in
 males; tubercles not curved forward at tips. Scales on
 dorso-lateral part of body without line paralleling outer
 edge. Caudal peduncle scales usually 16 (7-2-7). Size
 larger, reaching 175 mm. 6


1964