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b. sparsely pigmented, :s12 meIanophores (spots of black or brown pigment) on dorsal surface (Fig. 70) . . . . . . . . . . " 142 c. moderately to well pigmented, ?:c13 melanophores on dorsal surface (Figs. 71,85) ........................25 12 (1). Yolk. a. present ........................ 13 b. absent ......... . . . . . . . . . . . . . . . . 26 13 (12). Eyes a. unpigmented ............... C. ardens C. discobolus C. latipinnis b. lightly to moderately pigmented (FIgS. 14, 84) ....................... 114 c. darkly pigmented (Figs. 15, 85) . . . . . .. 14 14 (13). Body a. unpigmented to sparsely pigmented, :S12 meIanophores (spots of black or brown pigment) on dorsal surface (Fig. 70) .., 81 b. moderately to well pigmented, ?:c13 melanophores on dorsal surface (Figs. 71, 85) ........................ 25 15 (1). Yolk. a. present ........................ 16 b. absent ......................... 26 16 (15). Eyes a. lightly to moderately pigmented (Fig. 14) ........................... 17 b. darkly pigmented (Figs. 15) ......... 18 17 (16). Body a. unpigmented (Fig. 14) ........ C. ardens b. sparsely pigmented, :S12 meIanophores (spots of black or brown pigment) on dorsal surface (Fig. 70) . . . . . . . . . . .. 120 18 (16). Body a. unpigmented (Fig. 14) ........ C. ardens b. sparsely pigmented, :S12 melanophores (spots of black or brown pigment) on dorsal surface (Fig. 70) . . . . . . . . . . .. 120 c. moderately to well pigmented, ?:c13 meIanophores on dorsal surface (Figs. 15, 71) ........................ 34 19 (1). Yolk. a. present ........................ 20 b. absent ................... X. texanus 20 (19). Body a. sparsely pigmented, :S12 melanophores (spots of black or brown pigment) on dorsal surface (Fig. 70) . . . . . . . . C. ardens b. moderately to well pigmented, ?:c13 melanophores on dorsal surface (Figs. 15, 71) ........................ 1:7 21 (1). Dorsal midline from shortly behind head to near last myomeres a. with ?::25 melanophores in a distinct con- tinuous or nearly continuous line (Figs. 43, 71) . . . . . . . . . . . . (rarely) C. latipinnis b. with?::25 melanophores but in a shorter or distinctly discontinuous line or with :S24 melanophores (Figs. 15, 57) . . . . . . 22 22 (21). 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 mid- line (Fig. 57) ............. C. latipinnis b. with distinctly shorter or discontinuous lines of melanophores along one or both sides of dorsal midline (Fig. 15) ...... 23 c. without distinct lines of melanophores along either side of dorsal midline (Fig. 85) . . . . . . . . . . . . . . . . . . . . . C. ardens 23 (22). Pigment on ventral to ventro-Iateral surfaces of gill covers (opercula) a. absent (Figs. 15, 57) . . . . . . . . . . . . .. 120 b. present (Figs. 16, 17) ......... C. ardens 24 (6). Ventral midline from shortly behind heart region to near vent a. with?:c13 melanophores in a continuous or nearly continuous line or narrow band, or in a shorter or distinctly dis- continuous line (if?::21 melanophores on midline from heart to vent and pigment line extends into branchial region, anter- ior to heart, most probably C. commer- soni -- Fig. 31) (FIgS. 29, 71) ........ 38 b. with 7-12 melanophores (Fig. 43) . . . . . . . . . . . . . . . . C. platyrhynchus 25 (11,14). Ventral midline from shortly behind heart region to near vent a. with?:c13 meIanophores in a continuous or nearly continuous line or narrow band, or in a shorter or distinctly dis- continuous line (if?::21 melanophores on midline from heart to vent and pigment line extends into branchial region, anter- ior to heart, most probably C. commer- soni -- Fig. 31) (FIgS. 29, 71) ........ 38 b. with 7-12 melanophores (Fig. 43) ., .. . .. .. . . .. . . . C.platyrhynchus c. with:S6 melanophores (Fig. 85) X. texanus 26 (l2,15). Ventral midline from shortly behind heart region to near vent a. with?:c7 melanophores (Fig. 71) ................ C.platyrhynchus b. with:S6 melanophores (Fig. 85) X. texanus 27 (20). Ventral midline from shortly behind heart region to near vent a. with?::21 meIanophores in a continuous or nearly continuous line or narrow band (Fig. 30) .......... C. commersoni 40