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239 (236). Pigment over ventral to ventro-Iateral surfaces of gill covers (opercula) a. absent or present but not in distinct oblique rows (Figs. 16, 45, 59, 87) . . .. 240 b. present in a distinct oblique row of 3 or more melanophores near or along ven- tral margin of one or both preopercles (Fig. 17) ...................... 267 240 (239). Pigment on ventral surface of heart region a. absent (Figs. 45, 59) . . . . . . . . . . . . .. 241 b. present (Figs. 17,44,58,87) . . . . . . .. 244 241 (238,240). Lateral surface of body below horizontal myosepta (or lateral mid- line) exclusive of melanophores associated with horizontal myosepta, air bladder, visceral cavity (peri- toneum), or gut, a. unpigmented or with .s5 melanophores (Figs. 45, 59, 87) ................ 242 b. pigmented with ~6 me1anophores (Fig. 46) ................... C. discobolus 242 (241). Length from anterior margin of snout to posterior margin of vent a. 76-TI% SL . . . . . . . . . . . . . . . . . . . .. 261 b. 78-80% SL . . . . . . . . . . . . . . . . . . . .. 243 c. 81% SL . . . . . . . . . . . . . . . . . . . . . .. 304 d. 82-84% SL . . . . . . . . . . . . . . . . X. texanus 243 (242). Number of myomeres to posterior margin of vent a.35 ................... C.discobolus b. 36-40 . . . . . . . . . . . . . . . . . . . . . . . " 303 c. 41 ..................... X. texanus 244 (240). Lateral surface of body below hori- zontal myosepta (or lateral midline) exclusive of melanophores asso- ciated with horizontal myosepta, air bladder, visceral cavity (peri- toneum), or gut, a. unpigmented or with .s5 melanophores (Figs. 17,45,59,87) . . . . . . . . . . . . .. 245 b. pigmented with ~ melanophores (Fig. 46) ................... C.discobolus 245 (244). Length from anterior margin of snout to posterior margin of vent a. 76-TI% SL . . . . . . . . . . . . . . . . . . . ., 264 b. 78-80% SL . . . . . . . . . . . . . . . . . . . ., 246 c. 81% SL . . . . . . . . . . . . . . . . . . . . . ., 304 d. 82-84% SL . . . . . . . . . . . . . . . . X. texanus 246 (245). Number of myomeres to posterior margin of vent a. 34 ...................... C. ardens b. 35 .......................... 2TI c. 36-38 . . . . . . . . . . . . . . . . . . . . . . . .. 247 d. 39-40 ......................... 303 e. 41 ..................... X. texanus 247 (246). Total number of myomeres a. 43 ...................... C. ardens b. 44-45 . . . . . . . . . . . . . . . . . . . . . C. ardens X. texanus c. 46 . . . . . . . . . . . . . . . . . . . . . C. ardens C. latipinnis X. texanus d. 47-48 . . . . . . . . . . . . . . . . . . . . . C. ardens C. discobolus C. latipinnis X. texanus e. 49 . . . . . . . . . . . . . . . . . . C. discobolus C. latipinnis X. texanus 248 (26,197,198). Longitudinal eye diameter a. 24-26% of head length . . . . . C. discobolus b. 27-30% of head length . . . . . . . . . . .. 289 c. 31-33% of head length . . . . . . . . . . ., 249 d. 34% of head length .............. 272 e. 35-38% of head length. . . . . . . . C. ardens 249 (248). Pigment over ventral to ventro-lateral surfaces of gill covers (opercula) a. absent or present but not in distinct oblique rows (Figs. 16, 45, 87) ...... 250 b. present in a distinct oblique row of 3 or more melanophores near or along ven- tral margin of one or both preopercles (Fig. 17) ...................... 283 250 (249). Pi~ent on ventral surface of heart regIOn a. absent (Figs. 45, 88) . . . . . . . . . . . . .. 290 b. present (Figs. 17,44, 87) .......... 251 251 (250). Lateral surface of body below hori- zontal myosepta (or lateral midline) exclusive of melanophores asso- ciated with horizontal myosepta, air bladder, visceral cavity (peri- toneum), or gut, a. unpigmented or with .s5 melanophores (Figs. 17,45,87) ................ 252 b. pigmented with ~ melanophpres (Fig. 46) ......... . . . . . . . . . C. discobolus 252 (251). Length from anterior margin of snout to posterior margin of vent a. 76- TI% SL .................... 276 b. 78-80% SL .................... 253 c. 81% SL . . . . . . . . . . . . . . . . . . . . . ., 304 d. 82-84% SL ............... X. texanus 253 (252). Number of myomeres to posterior margin of vent a. 34 . . . . . . . . . . . . . . . . . . . . . C. ardens b. 35 . . . . . . . . . . . . . . . . . . . . . . . .. 277 c. 36-38......................... 254 d. 39-40 . .. .. .. . .. . .. .. .. .. .. .... 305 e. 41 . . . . . . . . . . . . . . . . . . .. X. texanus 254 (253). Total number of myomeres a. 43 . . . . . . . . . . . . . . . . . . . . . C. ardens b. 44-46 . . . . . . . . . . . . . . . . . . . . . C. ardens X. lexanus c. 47-48..................... C. ardens C. discobolus 69