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d. with ~ melanophores or without pig- ment (Fig. 86) ................... 16 11 (1). Yolk a. present ........................ U b. absent ......................... 15 12 (11). Maximum depth of yolk a. ~% SL . . . . . . . . . . . . . . . . C. discobolus b. ~% SL . . . . . . . . . . . . . . . . . . . . . . ., 13 13 (12). Length of yolk a. ~19% SL . . . . . . . . . . . . . . . . . . . . . . . 14 b. $18% SL . . . . . . . . . . . . . . . . . . . . . . . 15 14 (13). Ventral midline from shortly behind heart region to near vent a. with ~1 melanophores in a continuous or nearly continuous line or narrow band (Fig. 30) .............. C. commersoni b. with ~1 melanophores in a shorter or a distinctly discontinuous line (Fig. 44) . 26 c. with 7-W melanophores (Fig. 17) . . . . . . . . . . . . . . . . . . . C. discobolus d. with ~ melanophores or without pig- ment (Fig. 86) ................... 16 15 (11,13). Ventral midline from shortly behind heart region to near vent a. with ~1 melanophores in a continuous or nearly continuous line or narrow band (if midline pigment extends into bran- chial region anterior to heart, probably C. commersoni; Fig. 31) (Figs. 30, 72) . . 45 b. with ~1 melanophores in a shorter or a distinctly discontinuous line (Fig. 44) ...........................46 c. with 7-W melanophores (Fig. 17) ....... . . . . . . . . . . . . . . . . . . . C. discobolus d. with ~ melanophores or without pig- ment (Fig. 86) ................... 16 16 (10,14,15). Dorsal body pigmentation between head and last myomere a. scattered with no distinct lines of melan- ophores on or lateral (and parallel) to dorsal midline (Fig. 44) .... C. discobolus b. including at least a partial distinct line of melanophores on or lateral (and paral- lel) to dorsal midline (Fig. 86) ....... 17 17 (16). Dorsal surface lateral to midline from shortly behind head to about 2/3 distance to last myomeres a. with distinct lines of melanophores along one or both sides of dorsal midline (Fig. 86) ...........................18 b. without distinct lines of melanophores along either side of dorsal midline (Fig. 44) ................... C. discobolus 18 (17). Dorsal midline from shortly behind head to near last myomeres a. with ~ melanophores in a distinct con- tinuous or nearly continuous line, one or more shorter segments, or a distinctly discontinuous line (Figs. 45, 86) ...... 51 b. with $24 melanophores in one or more short lines, a discontinuous, well-spaced line or ( rarely) no distinct line of melanophores ............. X. texanus 19 (1). Yolk a. present ........................ W b. absent . . . . . . . . . . . . . . . . . . . . . . . . . 44 W (19). Maximum depth of yolk a. ~% SL . . . . . . . . . . . . . . . . . . . . . . . . 35 b. ~% SL . . . . . . . . . . . . . . . . . . . . . . . . 21 21 (W). Length of yolk a. ~19% SL . . . . . . . . . . . . . . . . . . . . . .. 22 b. $18% SL . . . . . . . . . . . . . . . . . . . . . . . 25 22 (21). Ventral midline from shortly behind heart region to near vent a. with ~1 melanophores in a continuous or nearly continuous line or narrow band (Fig. 30) .......... C. commersoni b. with ~1 melanophores in a shorter or a distinctly discontinuous line (Fig. 44) . 26 c. with 1-W melanophores (Figs. 16,58) . . 27 d. without pigment . . . . . . . . . . . . . . . . . . 47 23 (1). Yolk a. present ........................ 24 b. absent ................ . . . . . . . . . 44 24 (23). Maximum depth of yolk a. ~% SL . . . . . . . . . . . . . . . . C. discobolus b. ~% SL . . . . . . . . . . . . . . . . . . . . . . . . 25 25 (21,24). Ventral midline from shortly behind heart region to near vent a. with ~1 melanophores in a continuous or nearly continuous line or narrow band (Fig. 30) .......... C. commersoni b. with ~1 melanophores in a shorter or a distinctly discontinuous line (Fig. 44) . 26 c. with $2() melanophores or without pigment (Fig. 16) . . . . . . . . . . . . . . . . . 47 26 (10,14,22,25). Dorsal body pigmentation between head and last myomere a. scattered with no distinct lines of melan- ophores on or lateral (and parallel) to dorsal midline (F"Jg. 44) .... C. discobolus b. including at least a partial distinct line of melanophores on or lateral (and paral- lel) to dorsal midline (Fig. 30) ....... 79 27 (22). Dorsal body pigmentation between head and last myomere a. scattered with no distinct lines of melan- ophores on or lateral (and parallel) to dorsal midline (Fig. 44) .... C. discobolus b. including at least a partial distinct line of melanophores on or lateral (and paral- lel) to dorsal midline (FIgS. 16, 58) .... 28 48