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108 (107). Number of myomeres to posterior margin of vent a. up to 38 . . . . . . . . . . . . . . . . . . . C. ardens C. discobolus C. latipinnis b. 39 or more ............. C. discobolus 109 (61). Longitudinal eye diameter C. latipinnis a. up to 32% of head length . . . . . X. texanus b. 33% of head length or more . . . . . . .. 110 110 (109). Number of myomeres to posterior margin of vent a. up to 38 . . . . . . . . . . . . . . . . . . . . . ., 111 b. 39 or more ............... X. texanus 111 (110). Length from anterior margin of snout to posterior margin of vent a. up to 76% SL .............. C. ardens b. 77 to 80% SL . . . . . . . . . . . . . . . C. ardens X. texanus c. 81% SL or more ........... X. texanus 112 (58). Longitudinal eye diameter a. up to 29% of head length . . . . . X. texanus b. 30% of head length or more . . . . . . .. 114 113 (59). Longitudinal eye diameter a. up to 29% of head length . . . . . X. texanus b. 30 to 32% of head length . . . . . . . . .. 114 c. 33% of head length or more . . . . . . .. 115 114 (112,113). Length from anterior margin of snout to posterior margin of vent a. up to 76% SL ........... C. discobolus b. n to 80% SL ........... C. discobolus X. texanus c. 81% SL or more ........... X. texanus 115 (113). Length from anterior margin of snout to posterior margin of vent a. up to 76% SL ........... C. discobolus C. ardens b. n to 80% SL .................. 116 c. 81% SL or more ........... X. texanus 116 (115). Number of myomeres to posterior margin of vent a. up to 38 .................. C. ardens C. discobolus X. texanus b. 39 or more ............. C. discobolus X. texanus Postflexion Mesolarvae -- adult complement of principal caudal fin rays present but adult complement of principal dorsal or anal fm rays lacking (Figs. 3,17; definition abbre- viated for species of concern). Separate skeletal character key at end for confmna- tion of identity or further diagnosis of specimens cleared (and preferably stained) for bone. 1. Standard length (SL; Fig. 4) a. 11 mm . . . . . . . . . . . . . . . . . . . . . . .. 2A b. 12 mm . . . . . . . . . . . . . . . . . . . . . . . . . 28 c.13mm.........................IO d. 14 mm . . . . . . . . . . . . . . . . . . . . . . . . . 27 e. 15mm......................... 43 f. 16 mm . . . . . . . . . . . . . . . . . . . . . . . . . 80 g. 17 mm . . . . . . . . . . . . . . . . . . . . . . .. 101 h. 18-21 mm ............... C. latipinnis ']A (1). Ventral midline from shortly behind heart region to near vent with a. 'i?7 melanophores (Fig. 17) .. C. discobolus b. 1-6 melanophores or without pigment (Fig. 87) ........................ 7 2B (1). Ventral midline from shortly behind heart region to near vent with a. ~1 melanophores in a continuous or nearly continuous line or narrow band (FIg.31) .............. C. commersoni b. ~1 melanophores in a shorter or a distinctly discontinuous line (Fig. 45) . . . . 3 c. 7-20 melanophores (Fig. 17) . C. discobolus d. 1-6 melanophores or without pigment (Fig.87) ........................ 7 3 (28). Dorsal surface lateral to midline from shortly behind head to about 2/3 distance to last myomeres with a. distinct continuous or nearly continuous lines of melanophores along (parallel to) each side of dorsal midline (Figs. 30, 31) . . . . . . . . . . . . . . . . . C. commersoni b. distinctly shorter or discontinuous lines of melanophores along one or both sides of dorsal midline (Figs. 72, 73) .. . . . . . . 4 Co no distinct lines of melanophores along either side of dorsal midline (Figs. 44, 45) ...........................5 4 (3). Melanophores in lines lateral (and paral- lel) to dorsal midline between head and 2/3 distance to last myomeres mostly in a. single me (Fig. 31) . . . . . . . . . . . . . . . . . 5 b. obliquely oriented pairs or groups resulting in a "herring bone" or "tractor tread" pattern (Figs. 30, 59) C. commersoni 5 (3,4). Pigmentation of peritoneum a. absent on lateral and ventra-lateral surfaces (Figs. 30, 44) .............. 6 b. at least sparse or patchy on lateral surfaces (Fig. 45) .. . . . . . . . C. discobolus 6 (5). Principal dorsal fm rays a. absent ........................ 218 b. present (at least one) . . . . . . . . . . . ., 116 54