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c. without distinct lines of melanophores along either side of dorsal midline (Figs. 44, 71) . . . . . . . . . . . . . . . . . . . . . . . . . 42 41 (40). Dorsal midline from shortly behind head to near last myomeres a. with ~ melanophores in a distinct con- tinuous or nearly continuous line (Fig. 43) ........................... 97 b. with ~ melanophores but in a shorter or distinctly discontinuous line (Fig. 15) ......... ....... .......... 105 c. with s24 melanophores (Fig. 57) . . . . . . 73 42 (40). Dorsal midline from shortly behind head to near last myomeres a. with ~ melanophores in a distinct continuous or nearly continuous line (Fig. 71) ....................... 64 b. with ~ melanophores but in a shorter or distinctly discontinuous line (Fig. 45) ........................... 76 c. with s24 melanophores (Fig. 85) . . . . . . 51 43 (36). Dorsal midline from shortly behind head to near last myomeres a. with ~ melanophores in a distinct con- tinuous or nearly continuous line or in a shorter or distinctly discontinuous line (Figs. 45, 71) .................... 64 b. with s24 melanophores (Fig. 85) . . . . . . . . . . . . . . . . . . . . . . . . . . . C. discobo/us 44 (39). Dorsal midline from shortly behind head to near last myomeres a. with ~ melanophores in a distinct con- tinuous or nearly continuous line (Fig. 71) ................. C. platyrhynchus b. with ~ melanophores but in a shorter or distinctly discontinuous line (Fig. 15) ........................... 54 c. with:!>24 melanophores (Fig. 85) . C. ardens 4.5 (34). Pigment on ventral to ventro-Iateral surfaces of gill covers (opercula) a. absent (Figs. 15, 43, 57, 85) ......... 46 b. present (Figs. 16, 17) .............. 49 46 (45). Dorsal surface lateral to midline from shortly behind head to about 2/3 distance to last myomeres a. with distinct continuous or nearly contin- uous lines of melanophores along (paral- lel to) each side of dorsal midline (Fig. 57) ........................... 69 b. with distinctly shorter or discontinuous lines of melanophores along one or both sides of dorsal midline (Figs. 15, 43, 85) ........................... 47 c. without distinct lines of melanophores along either side of dorsal midline (Figs. 44, 71) . . . . . . . . . . . . . . . . . . . . . . . . . 48 47 (46). Dorsal midline from shortly behind head to near last myomeres a. with ;:as melanophores in a distinct con- tinuous or nearly continuous line (Fig. 71) .. . . . . . . . . . . . . . . . . . . . . . .. 102 b. with;:as melanophores but in a shorter or distinctly discontinuous line or with s24 melanophores (Figs. 15, 85) . . . .. 114 48 (32,46). Dorsal midline from shortly behind head to near last myomeres a. with;:as melanophores in a distinct con- tinuous or nearly continuous line (Fig. 71) .................. C. discobo/us b. with;:as melanophores but in a shorter or distinctly discontinuous line or with s24 melanophores (Figs. 45, 85) . . . . . . 51 49 (45). Dorsal surface lateral to midline from shortly behind head to about 2/3 distance to last myomeres a. with distinct continuous or nearly con- tinuous lines of melanophores along (parallel to) each side of dorsal midline (Fig. 57) ................. X. texanus b. with distinctly shorter or discontinuous lines of melanophores along one or both sides of dorsal midline (Figs. 15, 85) . . . 50 c. without distinct lines of melanophores along either side of dorsal midline (Fig. 71) ....... . . . . . . . . . . . . . . C. ardens 50 (49). Dorsal midline from shortly behind head to near last myomeres a. with;:as melanophores in a distinct con- tinuous or nearly continuous line (Fig. 43) . . . . . . . . . . . . . . . . . . . . X. texanus b. with;:as melanophores but in a shorter or distinctly discontinuous line or with s24 melanophores (Figs. 15, 85) . . . . . . 56 51 (42,48). Length from anterior margin of snout to posterior margin of eye a. 6-8% SL ....................... 52 b. 9% SL ................... C. ardens 52 (51). Number of myomeres to posterior margin of vent a. 35-36 .................... C. ardens b. 37-39 ......................... 53 c. 40-41 ................. C. discobo/us 53 (52). Length from anterior margin of snout to origin of pectoral rm a. 12-16% SL ................ C. ardens C. discobo/us b. 17-19% SL ................ C. ardens 54 (44). Pectoral rm length a. ~% SL . . . . . . . . . . . . . . . . . . . . . . . . 55 b. 10-12% SL ........... C. p/atyrhynchus 55 (54). Yolk length a. ~% SL ............ C.p/atyrhynchus b. 41% SL or more ................ 108 56 (50). Length from anterior margin of snout to posterior margin of eye 42